1. Hypothesis Test Review

2. A consumers group is concerned with the mean cost of dining in a particular restaurant. A random sample of 40 charges (in dollars) per person has a mean charge of $39.7188 with a standard deviation of $3.5467. Is there sufficient evidence at the 5% significance level to conclude that the mean cost per person exceeds $38.00?

3. Quart cartons of milk should contain at least 32 ounces. A random sample of 22 cartons contained an average of 31.836 ounces with standard deviation of 0.2517 ounce, and the data was normally distributed. Does sufficient evidence exist at the 1% significance level to conclude that the mean amount of milk in all cartons of this brand is less than 32 ounces.

4. In an experiment on relaxation techniques, random subject’s brain signals were measured before and after relaxation exercise with the following results. Is there sufficient evidence at the 5% significance level to suggest that the relaxation exercise slowed the brain waves? Person 12345 Before3238655030 After 2535565224

5. An automotive company executive claims that a mean of 48.3 cars per dealership are being sold each month with a standard deviation of 8.4. A major stockholder believes this claim is high and runs a test by randomly sampling 30 dealerships. What conclusion is reached if the sample mean is 45.4 cars at a significance level of 5%?