Quiz
Midterm
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Perguntas do quiz (67)
1A researcher uses an anonymous survey to investigate the television-viewing habits of American adolescents. Based on the set of 356 surveys that were completed and returned, the reasercher finds that these students spend average of 3.1 hours each day watching television. For this study, the set of 356 students who retired surveys is an example of a ___________.
- AParameter
- BStatistic
- CPopulation
- DSample
2The relationship between a statistic and a parameter is the same as the relationship between ___________.
- Aa sample and a population
- Ba statistic and a parameter
- Ca parameter and a population
- Ddescriptive statistics and inferential statistics
3Organizing a set of scores in a table is an example of using _______.
- AParameters
- BStatistics
- CDescriptive statistics
- DInferential statistics
4The average verbal SAT score for the entire class of entering freshman is 530. However, if you select a a sample of 20 freshman and compute their average verbal SAT score you probably will not get exactly 530. What statistical concept is used to explain the natural differences that exists between a sample mean and the corresponding population mean?
- AStatistical error
- BInferential error
- CSampling error
- DParametric error
5A recent study reports that students who just finished playing a prosocial video game were more likely to help others than students who had played a neutral or antisocial game. For this study, what is the independent variable?
- AThe students who were given the prosocial game
- BThe students who were given the neutral or antisocial game
- CThe kind of game given to the students
- DThe helping behaviour of the students
6In a correlational study,
- A1 variable is measured and 2 groups are compared
- B2 variables are measured and 2 groups are compared
- C1 variable is measured and there is only 1 group of participants
- D2 variables are measured and there is only 1 group of participants
7In an experimental study,
- A1 variable is measured and 2 groups are compared
- B2 variables are measured and 2 groups are compared
- C1 variable is measured and there is only 1 group of participants
- D2 variables are measured and there is only one group of participants
8For a research study comparing attitude scores for males and females, participant gender is an example of what kind of variable?
- AAn independent variable
- BA dependent variable
- CA quasi-independent variable
- DA quasi-dependent variable
9Which of the following is an example of a discrete variable?
- AThe age of each student in a psychology class
- BThe gender of each student in a psychology class
- CThe amount of time to solve a problem
- DThe amount of weight gained for each freshman at a local college
10Which of the following is an example of a continuous variable?
- AThe gender of each student in a psychology class
- BThe number of males in each class offered by the college
- CThe amount of time to solve a problem
- DThe number of children in a family
11Using letter grades (A,B,C,D and E) to classify student performance on an exam is an example of measurement on a(n) _________ scale of measurement.
- ANominal
- BOrdinal
- CInterval
- DRatio
12What additional information is obtained by measuring two individuals on an interval scale compared to an ordinal scale?
- AWhether the measurements are the same or different
- BThe direction of the difference
- CThe size of the difference
- DNone of the other options is correct
13For statistical purposes, it usually is not important to differentiate between which two scales of measurement?
- ANominal and ordinal
- BOrdinal and interval
- CInterval and ratio
- DNominal and interval
14What is the final step to be performed in the mathematical expression, (EX)2?
- ASquare each score
- BAdd the scores
- CAdd the squared scores
- DSquare the sum of the scores
15What is the first step to be performed in the following mathematical expression, EX2?
- ASquare each score
- BAdd the scores
- CAdd the squared scores
- DSquare the sum of the scores
16What is the final step to be performed when computing E(X - 2)2?
- ASquare each value
- BSubtract 2 points from each score
- CSum the squared values
- DSubtract 2 squared from each X squared value
17What is the first test to be performed when computing E(X + 2) squared?
- ASquare each value
- BAdd 2 points to each score
- CSum the squared values
- DSum the (X + 2) values
18What is the value of (EX) squared for the scores 1,5,2?
- A10
- B16
- C30
- D64
19What is the value of EX squared for the scores 1,0,2,4?
- A14
- B21
- C28
- D49
20What is the value of EX + 1 for the scores 1,0,2,4?
- A8
- B10
- C11
- D14
21You are instructed to subtract 6 points from each score, square ether resulting value, and find the same of the squared numbers. How would this set of instructions be expressed in summation notation?
- AEX - 4 squared
- B(EX - 4) squared
- CE(X-4) squared
- DEX squared - 4
22For the following data, N = _______.
X F
4 2
3 4
2 3
1 2- A10
- B11
- C28
- DCannot be determined from the table
23For the data in the following table, what is the value of EX?
X F
4 1
3 2
2 4
1 2- A10
- B15
- C20
- DCannot be determined from table
24A set of scores ranges from a high of X = 72 to a low of X=28. If these scores were put in a grouped frequency distribution table, what would be the best choice for the interval width?
- A2 points
- B5 points
- C7 points
- D10 points
25A set of scores ranges from a high of X = 24 to a low of X = 5. If these scores were put in a frequency distribution table with an interval width of 2 points, which of the following would be the top interval in the table?
- A4-5
- B23-24
- C24-25
- D22-24
26For the following frequency distribution of exam scores, how many students had scores higher than 79?
X F
90-94 3
85-89 4
80-84 5
75-79 2
70-74 1- A7
- B12
- C19
- DCannot be determined
27In a frequency distribution graph, frequencies are presented on the ____, and the scores are listed on the _____.
- AX axis; Y axis
- BHorizontal line; vertical line
- CY axis; X axis
- DClass interval; horizontal line
28Which types of graphs are used for data from an interval scale?
- AHistograms and bar graphs
- BPolygons and bar graphs
- CHistograms and polygons
- DHistograms, bar graphs and polygons
29If a distribution of scores is shown in a bar graph, you know that the scores were measured on a(n) ________ scale of measurement.
- ANominal or ordinal
- BOrdinal or interval
- CInterval or ratio
- Ddiscrete or continuous
30After recording the final grade (A,B,C,D,E) for each individual in class of n=26 students, the professor would like to display the grade distribution in a frequency distribution graph. what kind of graph should be used?
- AA Bar graph
- BA histogram
- CA polygon
- DEither a histogram or a polygon
31If a set of exam scores formed a negatively skewed distribution, what can you conclude about the students' scores?
- AMost of the students had relatively high scores
- BMost of the students had relatively low scores
- CAbout 50% of the students had high scores and the rest had low scores
- DIt is not possible to draw any conclusions about students scores
32The students in a psychology class seemed to think that the midterm exam was very easy. If they are correct what is the most likely shape for the distribution of exam score?
- ASymmetrical
- BPositively skewed
- CNegatively skewed
- DNormal
33What is the shape of the distribution for the following set of data?
X F
5 1
4 1
3 2
2 4
1 5- ASymmetrical
- BPositively skewed
- CNegatively skewed
- DNormal
34A population with a mean of u=6 has EX = 54. How many scores are in the population?
- AN = 9
- BN = 27
- CN = 6 X 54 = 324
- DCannot be determined from the information given
35A sample of n=5 scores has a mean of M = 12. What is EX for this sample?
- A12/5 = 2.40
- B5/12 = 0.417
- C5(12) = 60
- DCannot be determined from the information given
36After 5 points are subtracted from every score, the sample mean is found to be M=24. What was the mean for the original sample?
- A29
- B24
- C19
- DCannot be determined
37After every score in a sample is multiplied by 3, the mean is calculated and found to be M = 21. What was the mean for the original scores?
- A7
- B21
- C63
- DCannot be determined from the information given
38One sample has n=4 scores and M=10. A second sample has n = 8 scores and M = 4. If the two samples are combined, what is the mean for the combined sample?
- A72/12 = 6
- B14/5 = 2.8
- C14/12 = 1.167
- DCannot be determined
39Which of the following statements cannot be true for a distribution of scores?
- A60% of the scores are above the mean
- B60% of the scores are above the median
- C60% of scores are above the mode
- DAll the options are false
40Which of the following statements cannot be true for a distribution of scores?
- ANo one has a score exactly equal to the mean
- BNo one has a score exactly equal to the median
- CNo one has a score exactly equal to the mode
- DAll of the other options are false
41Which of the following statements is true?
- AIt is possible for a distribution to have two means
- BIt is possible for a distribution to have two medians
- CIt is possible for a distribution to have two modes
- DIt is possible for a distribution to have two medians or two modes
42A researcher measures eye color for a sample of n = 50 people. What would be appropriate to summarize the measurements?
- AMean
- BMedian
- CMode
- DAny of the three measurements could be used
43Under what circumstances is the median likley to produce a better measure of central tendency than the mean?
- AWith a symmetrical distribution
- BWith an extremely skewed distribution
- CWhen data consists of nominal measurements
- DWhen the data are numerical scores from an interval or ratio scale
44For a positively skewed distribution with a mode of X = 20 and a median of 25, what is the most likely value for the mean?
- AGreater than 25
- BLess than 20
- CBetween 20 and 25
- DCannot be determined
45A distribution is positively skewed. Which is the most probable order, from smallest to largest, for the three measures of central tendency?
- AMean, median, mode
- BMode, median, mean
- CMean, mode, median
- DMedian, mean, mode
46Which of the following is a consequence of increasing variability?
- AThe distance from one score to another tends to increase, and a single score tends to provide a more accurate representation of the entire distribution
- BThe distance from one score to another tends to increase, and a single score tends to provide a less accurate representation of the entire distribution
- CThe distance from one score to another tends to decrease, and a single score tends to provide a more accurate representation of the entire distribution
- DThe distance from one score to another tends to decrease, and a single score tends to provide a less accurate representation of the entire distribution
47A sample consist of n = 16 scores. How many of the scores are used to calculate the range?
- A2
- B4
- C8
- DAll 16
48Which set of scores has the smallest standard deviation?
- A11, 17,31,53
- B5, 11, 42, 22
- C145, 143, 145, 147
- D27, 105, 10, 80
49For a particular population, the largest distance (deviation) between a score and the mean is 11 points. The smallest distance between a score and the means is 4 points. Therefore the standard deviation _______
- Awill be less than 4
- BWill be between 4 and 11
- Cwill be greater than 11
- DIt is impossible to say anything
50A population of N=5 scores has EX = 20 and EX squared = 100. For this population, what is the value of SS?
- A20
- B80
- C100
- D380
51A population has SS = 100 and standard deviation squared = 4. How many scores are in the population?
- A25
- B26
- C200
- D400
52A population has SS = 100 and standard deviation squared = 4. What is the value of E(X-u) for the population?
- A0
- B25
- C100
- D400
53What are the values for SS and variance for the following sample of n = 3 scores? Sample 1,4,7
- ASS = 18 and variance = 6
- BSS = 18 and variance = 9
- CSS = 66 and variance = 22
- DSS = 66 and variance = 33
54Which of the following is true for most distributions?
- AAround 30 % of the scores will be located within one standard deviation of the mean
- BAround 50% of the scores will be located within one standard deviation of the mean
- CAround 70% of the scores will be located within one standard deviation of the mean
- DAround 90% of the scores will be located within one standard deviation of the mean
55For a population with u=60, which of the following values for the population standard deviation would cause X=68 to have the most extreme position in the distribution
- Astandard deviation of 1
- Bstandard deviation of 2
- Cstandard deviation of 3
- Dstandard deviation of 4
56under what circumstances would a score that is 10 points below the mean be considered to be an extreme value?
- AWhen the mean us much greater than 10
- BWhen the mean is much less than 10
- CWhen the standard deviation is much greater than 10
- DWhen the standard deviation is much less than 10
57What position in the distribution corresponds to a Z-score of Z = -1.00?
- ABelow the mean by 1 point
- BBelow the mean by a distance equal to 1 standard deviation
- CAbove the mean by 1 point
- DAbove the mean by a distance equal to 1 standard deviation
58What position in the distribution corresponds to a Z-score of z= -1.00?
- ABelow the mean by 1 point
- BBelow the mean by a distance equal to 1 standard deviation
- CAbove the mean by 1 point
- DAbove the mean by a distance equal to 1 standard deviation
59Which of the following z-sore values represents the location farthest from the mean?
- Az = +0.50
- Bz = + 1.00
- Cz = -1.00
- Dz = -2.00
60For a population with u=70 and o=8, what is the z-score corresponding to X=82?
- A+0.25
- B+ 0.75
- C+ 1.25
- D+1.50
61For a population with u=40 and o=8, what is the X value corresponding to Z=1.50?
- A44
- B50
- C52
- D58
62A population of scores has u=80. In this population, a score of X=86 corresponds to Z= +2.00. What is the population standard deviation?
- A2
- B3
- C6
- D12
63In N=25 games last season, the college basketball team averaged u=76 points with standard deviation of o=6. In their final game of the season, the team scored 89 points. Based on this information, the number of points scored in the final game was ________.
- Aa little above average
- Bfar above average
- Cabove average but it is impossible to describe how much above average
- Dthere is not enough information to compare
64A population with u=85 and o=12 is transformed into Z-scores. After the transformation, what is the standard deviation for the population of z-scores?
- Ao=12
- Bo=1.00
- Co=0
- DCannot be determined from the information given
65For any distribution, what is the z-score corresponding to the mean?
- A0
- B1
- CN
- DCannot be determined from the information given
66A distribution with u= 35 and o=8 is being standardized so that the new mean and standard deviation will be u=50 and o=10. In the new, standardized distribution, your score is X=45. what was your score in the original distribution?
- AX= 30
- BX=31
- CX=39
- DX=45
67A score that is 2 points higher than the sample mean has a z-score of z=0.50, and a score of X= 44 has a z-score of -1.00. What is the sample mean?
- AM=40
- BM = 46
- CM =48
- DM=50
Informações
- Descrição
- Statistics Quiz sobre Midterm , criado por Lindsay Thorpe em 19-11-2016.
- Autor
- Lindsay Thorpe
- Idioma
- English
- Visualizações
- 1
- Histórico
- Criado em 19 nov 2016 · atualizado em 15 dez 2016
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