Test
Midterm Chap 1-4
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Preguntas del test (29)
1A bar chart is most likely used to display which of the following?
- Aa continues variable
- Ba nominal variable
- Can ordinal variable
- Deither nominal or ordinal variable
2If a scatter diagram shows points that are reasonably aligned and are sloping downward from left to right, this implies that there is a negative linear relationship between the two variables
- AVerdadero
- BFalso
3In a scatter plot the points should always be connected with a line.
- AVerdadero
- BFalso
4Histograms cannot have gaps between the bars, whereas bar charts can have gaps.
- AVerdadero
- BFalso
5A scatter diagram can show whether a pair of variables has a strong or weak relationship, and also whether it is linear or curved.
- AVerdadero
- BFalso
6To show the relationship between amount of rainfall and the number of car accidents, the best type of graph to use is a scatter diagram.
- AVerdadero
- BFalso
7When using the Histogram tool in Excel to construct a frequency distribution and histogram, the bins represent the upper class limits.
- AVerdadero
- BFalso
8Bar charts can typically be formed with the bars vertical or horizontal without adversely affecting the interpretation.
- AVerdadero
- BFalso
9A major insurance company believes that for drivers between 16 years of age and 60 years the number of accidents per year tends to decrease as age increases. If this is the case, a scatter diagram should show a negative relationship between the two variables.
- AVerdadero
- BFalso
10To show how the price of a stock has changed over the last 3 months, the best type of chart to use is:
- Aa histogram
- Ba line chart
- Ca bar chart
- Da pie chart
11After developing a frequency distribution for a quantitative variable, a histogram can be developed with the horizontal axis representing the values of the variable and the vertical axis representing the frequency of occurrence in each class or group
- AVerdadero
- BFalso
12A histogram is most commonly used to analyze which of the following.
- ATime-series data
- Bordinal data
- CQuantitative data
- DNominal data
13a histogram can be constructed for data that are either quantitative or qualitative.
- AVerdadero
- BFalso
14When a histogram is constructed for discrete numerical data, there should be spaces between the bars of the histogram.
- AVerdadero
- BFalso
15A common rule of thumb for determining how many classes to use when developing a frequency distribution with classes is:
- ABetween 5 and 20 classes
- Bequal to 0.25 times the number of data values.
- Cat least 10 classes
- Dno fewer than 6 classes
16A cell phone service provider has 14,000 customers. Recently, the sales department selected a random sample of 400 customers accounts and recorded the number of minutes of long distance time used during the previous billing period. The data for this variable is considered to be nominal since the values are based on sample data.
- AVerdadero
- BFalso
17Cross-sectional data is a set of data values observed at successive points in time.
- AVerdadero
- BFalso
18Flavors of ice cream (chocolate, vanilla, strawberry, ect.) are an example of nominal data.
- AVerdadero
- BFalso
19An accountant has recently prepared a report for a client that contains a variety of graphs and chats. In doing so she has used descriptive statistical methods.
- AVerdadero
- BFalso
20A variable that has all the properties of an interval variable, but also has a true zero, is a ratio level variable.
- AVerdadero
- BFalso
21Possibly the most frequently used nonstatistical sampling procedure is the simple random sample.
- AVerdadero
- BFalso
22The difference between interval data and ratio data is that interval data has a natural zero.
- AVerdadero
- BFalso
23Descriptive statistics allow a decision maker to reach a conclusion about a population based on a subset from the population.
- AVerdadero
- BFalso
24In order to compute the mean and standard deviation, the level of data measurement should be:
- ANominal
- Bqualitative
- Cratio or inteval
- Dordinal
25The following data reflect the number of customers who return merchandise for a refund on Monday. Note these data reflect the population of all 10 Mondays for which data are available.
40, 12, 17, 25, 9, 46, 13, 22, 16, 7
Based on these data what is the standard deviation?- A13.03
- B152.8
- C39
- D12.36
26Which of the following statements is true?
- AThe population mean and sample mean for a sample selected from that population will usually be different values.
- BThe population mean and sample mean will always be identical
- CThe mean of the population will generally be larger than the mean of the sample selected from that population.
- DThe mean of a population will always be larger than the population standard deviation.
27The method of probability assessment that is least likely to be used by a business decision maker is:
- ASubjective assessment
- Bclassical assessment.
- Crelative frequency of occurrence.
- DNone of the above is used by decision makers
28Men have a reputation for not wanting to ask for directions. A harris study conducted for Lincoln Mercury indicated that 42% of men and 61% of women would stop and ask for directions. The U.S. Census Bureau's 2012 population estimate was that for individuals 18 or over 48.2% were men and 51.8% were women. This exercise addresses this age group.
Given that a driver stops and ask for directions, determine the probability that the driver was a man.- A0.420
- B0.316
- C0.390
- D0.518
29Of the last 100 customers entering a computer shop, 25 have purchased a computer. If the classical probability assessment for computing probability is used, the probability that the next customer will purchases a computer is:
- A0.75
- B0.25
- C0.50
- D1.00
Información
- Descripción
- college Bus. stats Test sobre Midterm Chap 1-4, creado por Nicholas Stenquist el 20/09/2015.
- Autor
- Nicholas Stenquist
- Idioma
- English
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