What is the purpose for post hoc tests? a. to determine whether or not a Type I

Question

What is the purpose for post hoc tests? a. to determine whether or not a Type I error was committed. b. to determine how much difference exists between the treatments. c. to determine which treatments are significantly different. d. none of the above. What is indicated by a positive value for a correlation? a. increase in X tend to be accompanied by increases in Y b. increases in X tend to be accompanied by decreases in Y c. a much stronger relationship if the correlation were negative d. a much weaker relationship than if the correlation were negative What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks? a. the Spearman correlation. b. the point-biserial correlation. c. the phi coefficient. d. It is still called a Pearson correlation. A researcher wants to determine the effects of a cognitive rehabilitation program on restoring verbal comprehension after TBI to the temporal lobe. She measures TBI sufferers before entering the program, immediately after entering the program, one year after the program's conclusion and five years after the program's conclusion. The inferential test this research should use to evaluate the program's effectiveness across time is: a. the repeated-measures t-test b. the matched-pairs t-test c. the independent-measures ANOVA d. the repeated-measures ANOVA A researcher obtains a negative value for chi-square statistic. What can you conclude because the value is negative? a. The observed frequencies are consistently larger than the expected frequencies. b. The expected frequencies are consistently larger than the observed frequencies. c. There are large differences between the observed and expected frequencies. d. The researcher made a mistake. The value of chi-square cannot be negative. A researcher selects a sample of 100 people to investigate the relationship gender (male/female) and registering to vote. The sample consists of 40 females, of whom are registered voters, and 60 males, of whom 40 are registered voters. If these data were a chi-square test for independence, what is the observed frequency for registered males? a. 12 b. 28 c. 40 d. 42

Explanation / Answer

ANSWERS:

12) (b)

Explanation: Post hoc tests are run to confirm where the differences occurred between groups, they should only be run when you have a shown an overall statistically significant difference in group means.

13) (a)

Explanation: Positive correlation states that both the variables deviate in the same direction.(both are increases or both are decreases)

14 (a)

Explanation: If the data converted into ranks then it is said to be spearman rank correlation

15(b)

16(d)

Explanation: It is completely depends on frequencies. It can never be negative.

17)(c)

Explanation: There are 60 males. Out of 60 , 40 of them were registered voters.Therefore 40 is the observed frequencyfor registered males

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