Important for Interpretation In the excerpt, the main effect for gender (as indi
ID: 3375554 • Letter: I
Question
Important for Interpretation In the excerpt, the main effect for gender (as indicated by Fgender) is based on a comparison of the mean for all women and the mean for all men. The main effect for ethnicity (as indicated by Fethnicity) is based on a comparison of the mean for all Anglos and the mean for all Hispanics. Excerpt from the Article Ti At Subjects were 259 female and 102 male students (plus two who did not indicate their gender) who were enrolled in 11 undergraduate and 2 graduate classes at a large urban university...with a median age of 24. The instrument used to capture this information was an anonymous questionnaire [that included a list of 18 experiences and asked [the subjects] to indicate how many times they had 'ever had each of the following experiences." Responses were coded as O (if it has never happened to you), 1 (f it has happened to you once or twice), 2 (3 to 5 times), 3 (6 to 10 times), and 4 (more than 10 times). Table 1 presents the mean scores of male and female Anglos and Hispanics in their responses to the questions about the frequency with which they had experienced each of the 18 types of aggression....None of the interactions between ethnicity and gender approached significance. Table l Moan Scores for Anglo and Hispanic Males and Females on Experiences As Tare Males Females Item Something thrown at you Anglo Hisp. Anglo Hisp 1.38 2.54 2.05Explanation / Answer
1.
If the significance level is 0.05, we will count all test statistic with * on it.
There are 21 test statistic, which have * on it showing the statistical significance. Thus,
21 null hypothesis should be rejected.
2.
As, none of the interactions between ethnicity and gender approached significance, the researcher did not give the p-value for the interactions.
3.
Based on the data from table 1, we calculate the mean for each combination of gender and ethnicity.
As, given in the excerpt, we need to investigate the overall main effect of gender and ethnicity, we prefer this type of table (contingency table) for reporting the means.
We cannot determine whether the difference between Anglo males and Hispanic males is statistically significant based on the data given in Table 1. However we can calculate the overall mean and standard deviation of observations for Anglo males and Hispanic males and then use two sample t test to test for the signifcance of differences.
As, we have collected the data only from one urban universities, it cannot be generalized in other large urban universities. If the data is collected from random samples of different urban universities, we can generalize the results in other large urban universities.
Anglo Hispanic Males 1.94 1.73 Females 1.50 1.17