Variable Number of Cases Mean Std. Dev. Std. Error

Y 4 4.000 2.000 1.000

a. Set up the null and alternative hypotheses.

b. Calculate the test statistic and indicate whether the P-value was below 0.05, based on using the appropriate table.

c. Make a decision, using = .05. Interpret.

d. If the decision in (c) is actually (unknown to us) incorrect, what type of error has been made? What could you do to reduce the chance of that type of error?

e. True or false? When we make a decision using = .05, this means that if the special class is truly beneficial, there is only a 5% chance that we will conclude that it is not beneficial.