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    Six basic statistics questions regrading hypothesis testing

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    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

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    https://brainmass.com/statistics/hypothesis-testing/six-basic-statistics-questions-regrading-hypothesis-testing-584651

    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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