1) For which of the following research situations would it be more appropriate t
ID: 3371358 • Letter: 1
Question
1) For which of the following research situations would it be more appropriate to run an independent samples t test?
None of the situations listed here would use an independent samples t test design.
A researchers wants to study whether a special diet can increase the average IQ in the U.S. population over its current known mean of 100.
A researcher wants to study the effects of alcohol by comparing participants' reaction times before and after drinking.
A researcher wants to test whether race car drivers weigh less on average than marathon runners.
2) When do we need to use post-hoc tests?
Whenever we run an ANOVA test.
When we reject the null in a t test.
When we accept the null in an ANOVA test.
When we reject the null hypothesis in an ANOVA test
3. The homogeneity of variance assumption in an independent samples t test means that we assume:
the variances of the two samples are equal.
the variances of the two populations are equal.
There is no homogeneity of variance assumption in statistics.
the variances of the two populations are not equal.
4) A researcher reports the following results for an independent samples t test: t(78) = 3.28, p > .05. How many total participants were there in the study?
a.None of the situations listed here would use an independent samples t test design.
b.A researchers wants to study whether a special diet can increase the average IQ in the U.S. population over its current known mean of 100.
c.A researcher wants to study the effects of alcohol by comparing participants' reaction times before and after drinking.
d.A researcher wants to test whether race car drivers weigh less on average than marathon runners.
Explanation / Answer
1.A) The difference you see in the samples to the difference you'd expect to see due to sampling error
2.D) when we reject the null hypothesis in a ANOVA test.
3.B) when the variances of the population are equal
4.B
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