Question

1. Which measure of variability could remain unchanged if one score in the sample decreased by 10 points?

1. range
2. variance
3. standard deviation
4. All of these measure would always change if one score were changed.

1. Which correlation represents the strongest relationship?

1. +.37
2. +.68
3. -1.23
4. +1.23

1. If you were interested in testing for mean differences between the performance of the same participants under two different conditions, you could use:

1. Independent samples t-test.
2. Paired t test
3. ANOVA.
4. Correlation

Answer 1

1.

range is difference between highest and lowest value

so if the value that is decreased by 10 points was not the highest value initially and is not smaller than the lowest value then range may remain unchanged

variance and std. deviation change with each value being changed

ANSWER : option i. range

2.

strongest correlation is highest one

Answer : option iv. +1.23

3.

same participants under two different conditions : the test used will be paired t test

ANSWER : option ii. Paired t test

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