15) You conduct a study examining the average distance walked to school for kind

Question

15) You conduct a study examining the average distance walked to school for kindergarten, first and second graders. You analyze the data using ANOVA and determine your F value is significant. You know this means:

a) the kindergarteners walked less distance than both the first and second graders

b) the second graders walked further than the kindergarteners

c) there is a significant difference between each of these groups

d)there is a significant difference between at least two of these groups

16) The study you are reading reports a significant correlation coefficient of -0.5 between home size and hours spent at work. You know this means:

a) there is no relationship between home size and hours spent at work

b) there is a weak relationship between home size and hours spent at work

c) as home size gets larger, hours spent at work get smaller

d) as home size gets smaller, hours spent at work gets smalls

17) Which statistic is most appropriate for measuring the strength of the association between an exposure and disease outcome in a case-control study?

a) attributable risk in the population

b) student t-test

c) relative risk

d) odds ratio

Explanation / Answer

Solution15:

AnovA:

to test significant difference in means fro more than 2 groups

calculate F

P<0.05 Reject H0:

We conclude ther is significant difference in means fro more than 2 groups.

given F value is significant

there is a significant difference between at least two of these groups

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