PSY 325 Final Exam Paper

1. A group of researchers conducted an experiment to determine which vaccine is more effective for preventing getting the flu. They tested two different types of vaccines: a shot and a nasal spray. To test the effectiveness, 1000 participants were randomly selected with 500 people getting the shot and 500 the nasal spray. Of the 500 people were treated with the shot, 80 developed the flu and 420 did not. Of the people who were treated with the nasal spray, 120 people developed the flu and 380 did not. The level of significance was set at .05. The proportion of people who were treated with the shot who developed the flu = .16, and the proportion of the people who were treated with the nasal spray was .24. The calculated p value = .0008.

We have to research Is there any significant difference between two typres of vaccine i.e, a shot and nasal spray used for preventing nasal spray?

2. A researcher has investigated the relationship between IQ and grade point average (GPA) and found the correlation to be .75.
(a) The amount of variability in either variable, X or Y

(b) Differences in the shapes of the two distributions,

(c) Lack of linearity in the relationship between X and Y

(d) The presence of one or more “outliers” in the dataset

(e) Characteristics of the sample used for the calculation of the correlation and

(f) Measurement error.

3. A researcher has recorded the reaction times of 20 individuals on a memory assessment. The following table indicates the individual times: