PSYC 228 HW #6

Tawanda measured men's reactions to different colors of lipstick. She had 9 different colors of lipstick. She had 20 female models wear each color. She had 20 men answer questionnaires about the colors. She chose an alpha of 0.01. What is the family-wise or experiment-wise error rate if she carried out the maximum number of t-tests?

0.3

Tawanda measured men's reactions to different colors of lipstick. She had 9 different colors of lipstick. She had 20 female models wear each color. She had 20 men answer questionnaires about the colors. What is the maximum number of t-tests could she do?

36

Tawanda measured men's reactions to different colors of lipstick. She had 9 different colors of lipstick. She had 20 female models wear each color. She chose an alpha of 0.01. If she wanted to see the whether the color Cherry Cola red was most attractive to men, what is the most liberal pairwise comparison test to use?

LSD

Tawanda measured men's reactions to different colors of lipstick. She had 9 different colors of lipstick. She had 20 female models wear each color. She had 20 men answer questionnaires about the colors. She chose an alpha of 0.01. If she found a p-value of 0.037, should she do a posthoc test?"

No, the p-value is greater than alpha

Professor Fofana wonders if there is an association between students' grades and whether they complete extra credit in his classes. He makes a scatterplot, with the number of extra credit points earned on the x-axis and the numerical grade in his course without extra credit on the y-axis. He finds that r = 0.28. What does this correlation tell him about which students take advantage of the extra credit option?

Students with higher grades are more likely than students with lower grades to do extra credit work.

Jenna is interested in the association between the height of professional basketball players and their free-throw shooting percentage. She looks at the correlation between NBA players and their free-throw percentage from last season and she finds a statistically significant negative association. Jenna's friend Elizabeth suggests that Jenna should look at scatter plot of the data. Jenna follows Elizabeth's advice and finds that one of the players is much shorter than the rest of the players and that player has a much better free-throw shooting percentage. When Jenna removes this player from her analysis, she finds that there is no longer a statistically significant relationship between height and free-throw shooting. What kind of problem has Elizabeth helped Jenna identify?

a problem with an outlier in the sample

Tawanda measured men's reactions to different colors of lipstick. She had 9 different colors of lipstick. She had 20 female models wear each color. She had 20 men answer questionnaires about the colors. She chose an alpha of 0.01. What is the best inferential statistic to use?

repeated-measures one-way ANOVA

"Tawanda measured men's reactions to different colors of lipstick. She had 9 different colors of lipstick. She had 20 female models wear each color. She had 20 men and 20 women answer questionnaires about the colors. She chose an alpha of 0.01. If she wanted to see the whether the color Cherry Cola red elicited different reactions from men and women, what is/are the degree(s) of freedom for this particular part of her research?"

t (38)