please help.
Suppose that over the past 30 years, during any given week if the major league season , an average of μ=12 players are hot by wild pitches. Assume that the distribution is normal with σ=3. For a sample of n=4 weeks in which the daily temperature was extremely hot, the weekly average of hit –by-pitch players was M=15.5. Are players more likely to get hit by pitches during hot weeks? Set α=.05 for a one-tailed test

Question

please help.
Suppose that over the past 30 years, during any given week if the major league season , an average of   μ=12 players are hot by wild pitches. Assume that the distribution is normal with   σ=3. For a sample of n=4 weeks in which the daily temperature was extremely hot, the weekly average of hit –by-pitch players was M=15.5. Are players more likely to get hit by pitches during hot weeks? Set α=.05 for a one-tailed test