Question

It has often been suggested that elements in our environment can provide cues for recalling past information. For example, a hypothetical study examined the effect of a specific perfume scent on students’ abilities to recall a set of objects. A random sample of 18 subjects was randomly assigned to one of two conditions: 1) Nine subjects memorized and then recalled a set of objects while a scent was present in the air. 2) The other nine subjects memorized and then recalled a set of objects when the scent was not present. The following data were collected:

Scent 35 22 29 31 34 24 21 33 28

No Scent 20 22 19 15 14 19 20 23 22

a. Describe the independent variable and its levels.

b. Describe the dependent variable and its scale of measurement (N.O.I.R.)

c. What does the null hypothesis predict for the problem described above. (Be sure to use the variables given in the description.)

d. Conduct the appropriate statistical test of the null hypothesis using p = .05. Be sure to properly state your statistical conclusion.

e. Provide an interpretation of your statistical conclusion to part D.

f. Obtain the 95% confidence interval for the sample statistic.

g. Provide an interpretation for the interval obtained in part F.

h. How could the statistical power of this study be improved (or increased)?

Answer 1