Flashcards
RM2 Test 1 prep
Cards in this deck (37)
- 1How do you know when to run a 1 tailed test?it is used for when a hypothesis predicts the results in a particular direction
i.e. x will be HIGHER than y - 2How do you know when to use a 2 tailed test?it is used for predicting a difference but not the relationship i.e. x will be DIFF. than y
- 3if Alpha is set at 5% which p.values indicate a significant result?Options:
a) p= 0.001
b) p=0.0498
c) p=0.5
d) p=0.01 - 4Alpha set question continued (repeat options to chardy and let her tell you which numbers/letters are right)Correct answers:
A
B
D - 5what is the mode in each set of data?the most common variable
- 6what is the x axis forthe independent variable
- 7what is the y axis forthe dependent variable
- 8do the placement of variables matter for correlations?no theres no difference
- 9how do you describe scattergrams relationships?they are either:
- positive
- moderate
- weak
or
negative - 10how is a pearson correlation different from a spearmanswhen writing out a pearson correlation there is no s next to the r
- 11how is the correlation .000 reported as?.001
- 12what does the standard deviation approximateit approximates the average deviations of scores from the mean
- 13if a data set has a variance of 9 what would the standard deviation be?ANS = 3
because the standard deviation is the square root of the variance - 14describe the characteristics of a normal distributiona symmetrical bell-shaped curve where the mean, median & mode all fall at the same point
- 15roughly how many scores fall within one standard deviation of the mean?67%
- 16calculate the z score using the following data score: 50 mean: 25 standard deviation: 25ANS
50-25/25 = 1 - 17use the appropriate z score formula to find the following: score: 50 mean: 25 standard deviation: 25 sample: 100ANS = 10
- 18how is a correlation written (expressed)r(N)= correlation p<. significance
- 19find the variance for the following numbers: 2,3,6,5,2,7,9,10,28,8ANS = 51.6
- 20find the sample score of using the following figures: score: 304.5 mean: 300 standard deviation: 9 sample: 16ANS = 2
- 21how do you sort out variables for a partial correlationplace wanted variables into 'variables' section
unwanted variables go into 'controlling for' section - 22how do you form a correlation matrix on SPSS1. go to analyse
2. go to correlate --> bivariate
3. put all variables into box, hit okay - 23when are values considered to be significant?if they are less than .05
- 24what is a linear relationshipbeing able to draw a straight line on the graph
- 25what is the equation for the variancegreek symbol for sum
bracket X - U bracket square
divided by N - 26find the standard deviation of the sample using the following numbers: 2,3,4,5,6square root of 2.5
- 27why might we run a partial correlationit is used if we want to control for a 3rd variable that we think might influence the correlation between the other variables
- 28what is the rationale behind z-scorea z-score is a standardised score
the z-score gets converted from its original into a score that tells us how many standard deviations the score falls from the mean - 29how do you calculate the standard deviationstep 1: find the mean of the scores provided
step 2: subtract the mean from the scores
step 3: take the above step ANS & than square it
step 4: add up all the squared deviations and divide it by the # of scores provided
step 5: take the ANS from step 4 and square root it
step 6: the square root ANS is the standard deviation - 30Can you calculate a mean average for a set of ordinal (rank) data?no because ordinal only tells the rank not the quantity
- 31what is standard deviationthe average distribution around the mean:
- 32what is the average deviation around the mean?zero
- 33what is the variancea useful number when using the maths and stats
- 34does the variance relate to the data or scale we're using?no
- 35what is the relationship between the variance and standard deviation?you square root the variance to get the standard deviation
- 36what is standard error?the average deviation of the mean of the sample, to be different from the mean of the population
- 37is standard error a perfect representation of the data, yes or naw?no
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- Flashcards on RM2 Test 1 prep, created by Chardonae Rawlins on 07/11/2016.
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- Chardonae Rawlins
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