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Which of the following would have the highest power?

Even if a treatment has an effect, it is still possible to obtain a sample mean that is very similar to the original population mean.  What outcome is likely if this happens?

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?

A vertical line is drawn through a normal distribution at z = 1.20.  What proportion of the distribution is on the left-hand side of the line?

Statistical power is the probability that a statistical test will  ________

A normal distribution has a mean of µ = 40 with σ = 10.   What proportion of the scores in this distribution are greater than X = 55?

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 = 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?

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?