A researcher investigates whether or not a new cold medicine has an effect on mental alertness. The scores for the population on a test of problem-
solving ability are Population Mean = 64 and Population Standard Deviation= 8. A random sample of n=16 participants is given the cold medicine and
tested an hour later. Does the cold medicine have an effect on mental alertness? For this sample, the Sample Mean = 58. Answer the following
Questions. Alpha level = .05
Is the problem asking for a one- or two-tail test of the hypothesis? Write one, two, or neither two
Critical value(s) of z? Include sign(s) +, -, +/- +/- 1.96
What is the standard error of the mean?
What is the calculated value of z? Include sign + or -
What is your statistical decision? Write reject or fail to reject.
Which of the following statements best describes the findings of this study? Pick only one
A. The drug increases problem-solving ability.
B. The drug decreases problem-solving ability.
C. The drug has no effect on problem-solving ability
D. The drug has an effect on problem-solving ability.
