PSYCHOLGY STATISTICS QUESTIONS:

1.If a researcher reports a one-samplet-test withdf= 24, how many individuals participated in this study?

2. Suppose you have randomly selected high school students to take a course to improve their SAT scores. You find that the mean of their subsequent SAT scores is not significantly different from the population mean of SAT scores for those students who have not taken the course. Which of the following statements is the most appropriate conclusion?

a. we have proven that the course affects SAT scores

b. we have obtained no convincing evidence that the course affects SAT scores

c. we have obtained convincing evidence that the course affects SAT scores

d. we have proven that the course does not affect SAT scores

3. When you are reading research, you must be carefulhow you interpret the results. This is because:

a. statisticians may make errors or they may actually have fake data

b. statistics do not prove anything at all

c. statistics should be replicated by independent studies before we put complete faith in the findings

d. all of the above

4. I want to know if my mean score is 99% or more unusual compared to all means that could possibly occur. In order to determine this, I would

a. disregard the data from 99% of all tests

b. change my alpha level to .99

c. change my alpha level to .05

d. change my alpha level to .01

5. Is it a one tailed or 2 tailed tests (where applicable).

A sample of stores was selected and divided randomly into three groups. Group I initiated the policy of giving trading stamps, Group II initiated the lottery-type card punching policy, and Group III initiated neither. The stores were also classified as being located in a community of low, medium, or high economic level. After a period of two months, Monetary sales for each of the stores was examined.Is there a significant difference between the groups in terms of sales over the period?