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Six basic statistics questions regrading hypothesis testing

A two tailed hypothesis test is being uses to evaluate a treatment effect with o= .05. if the sample data produce a z- score of z= -2.24 what is the correct decision?

* reject the null hypothesis and conclude that the treatment has an effect
* fail to reject the null hypothesis and conclude that the treatment has no effect
* fail to reject the null hypothesis and conclude that the treatment has an effect
* reject the null hypothesis and conclude that the treatment has no effect

the critical boundaries for a hypothesis test are z= +1.96 and -1.96. if the z score for the sample data is z= -1.90, what is the correct statistical decision?

* reject H1
* reject Ho
* fail to reject Ho
* fail to reject H1

A researcher administers a treatment to a sample of participants selected from a population with u= 80. If a hypothesis test is used to evaluate the effect of the treatment which combination of factors is most likely to result in rejecting the hypothesis?

* a sample mean much different than 80 with o= .01
* a sample mean near 80 with o=.01
* a sample mean much different than 80 with o= .05
* a sample mean near 80 with o= .05

under what circumstances can a very small treatment effect still be significant
* if the standard error of M (oM) is very large
* if the sample size of (n) is very large
* if the sample standard deviation (o) is very large
* all of these factors are likely to produce significant results.

A sample of n=9 individuals is selected from a population with u= 60 and o=6, and a treatment is administered to the sample. after the treatment, the sample mean M= 63. What is the Cohen's d for this sample?

* 1.00
* 0.33
* 2.00
* 0.50

Which of the following is an accurate definition for the power of a statistical test?
* the probability of supporting a false null hypothesis
* the probability of rejecting true null hypothesis
* the probability of rejecting a false null hypothesis
* the probability of supporting true null hypothesis

Solution Preview

1. reject the null hypothesis and conclude that the treatment has an effect

2. fail to ...

Solution Summary

The solution gives detailed steps on explaining 6 basic statistics questions including hypothesis testing, power of test, cohen's d coefficient and so on.

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