1) A researcher is interested in the average extraversion level of librarians. In reality, the sample consists of 50 introverts who score extremely low on the extraversion scale and one extremely extraverted actor (who is researching how to play a librarian for an upcoming film). Which of the following measures of central tendency will be problematic in this context? why?
a) the mean; it is distorted by the presence of outliers
b) the median; it is distorted by the presence of outliers
c) the mean; this sample has a restricted range
d) the median; this sample has a restricted range
2) which of the following is the “signal” used to calculate the t value in a t-test (as opposed to the “noise”)?
a. The difference between the two conditions on the dependent measure
b. The degree to which two interval variables are correlated with one another
c. The overall variation between three or more conditions on the dependent measure
d. Random variation in the dependent measure within each condition
3) Which of the following is the “noise” used to calculate the t value in a t-test?
e. The degree to which two interval variables are correlated with one another
f. Random variation in the dependent measure within each condition
g. The overall variation between three or more conditions on the dependent measure
h. The difference between the two conditions on the dependent measure
4) Dr. Bem finds that there is a positive correlation between sensation-seeking and the ability to predict the future. In reality, there is no such correlation. This is…
i. A Type 1 error
j. A Type 2 error
k. The result of low statistical power
l. Not an error at all
5) What does the p value represent?
a. The probability of the observed results being obtained by chance, assuming the null hypothesis is true.
b. The probability of the observed results being obtained by chance, assuming the null hypothesis is false.
c. The correlation between the independent and dependent variable
d. The correlation between the independent variable and the confound
6) An independent samples t-test is used to determine if…
12. 2 groups are significantly different from each other
13. 2 within-subject conditions are significantly different from each other
14. 3 or more groups are significantly different from each other.
15. 2 interval variables are positively, negatively, or uncorrelated with each other
7)A pairedsamples t-test is used to determine if….
a. 2 groups are significantly different from each other
b. 2 within-subject conditions are significantly different from each other
c. 3 or more groups are significantly different from each other.
d. 2 interval variables are positively, negatively, or uncorrelated with each other
