Which of the following would have the highest power?

A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores.  The hypothesis test produces a z-score of z = 2.37.  If the researcher is using a one-tailed test, what is the correct statistical decision?

What proportion of a normal distribution is located in the tail beyond z = 2.00?

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, then what is the correct statistical decision?

Statistical power is the probability that a statistical test will  ________

For a population standard deviation of 10, how large would the sample be needed to have a standard error of 5 points?

A sample of n = 25 individuals is selected from a population with µ = 80 and a treatment is administered to the sample.  What is expected if the treatment has no effect?

A sample of n = 4 scores is obtained from a population with µ = 70 and σ = 8.  If the sample mean corresponds to a z-score of 2.00, then what is the value of the sample mean?

What proportion of a normal distribution is located in the tail beyond z = –1.00?

On Halloween, Oprah puts candy out in a bowl – there are 20 Reese’s, 25 Junior Mint boxes, and 15 Laffy Taffys. When the first trick-or-treater comes by, what is the probability they choose a Junior Mint Box?