Complete the below:
Q1: 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
Q2: 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.
Q3: 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
Q5: 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