A sociologist Believes mat the average income of elderly women is lower than the

Question

A sociologist Believes mat the average income of elderly women is lower than the average income of Elderly men. IS there a difference in me amount of study time on-campus and off-campus students devote to their school work during an average week? You prepare a survey to determine the average number of study hours for each group of students. Reading scores for a group of third graders enrolled in an accelerated reading program are predicted to be higher than the scores for non-enrolled third graders. Stress (measured on an ordinal scale) is predicted to be lower for adults who own dogs (or other pets) than for non-pet owners. For each situation in Exercise 3, describe the Type 1 and Type 11 errors that could occur. What are the general implications of making a Type 1 error? Of making a Type 11 error? When would you want to minimize Type 1 error? Type 11 error?

Explanation / Answer

f) Left-tailed test (predicted stress is lower for adults with pets than adults without pets)

H0:mu p-mu np=0 (stress is same for adults with and without pets)

H1: mu p-mu np<0 (stree is lower for adults with pets)

e) Right-tailed test

H0:mu enrolled-mu non enrolled=0

H1:mu enrolled- mu non enrolled>0

d) Two-tailed test.

H0:mu campus score-mu off campus score=0

H1:mu campus score not equal to mu off campu score.

c) Left-tailed test.

H0:mu elderly women>=mu elderly men

H1:mu elderly women< mu elderly men

b) Right-tailed

H0:mu parties=3.2

H1:mu parties>3.2

a) Two-tailed

H0: mu income=50054

H1:mu income not equal to 50054

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