A recent national survey found that high school students watched an average (mean) of 6.8 movies per month with a population standard deviation of 1....

A recent national survey found that high school students watched an average (mean) of 6.8 movies per month with a population standard deviation of 1.8. The distribution of number of movies watched per month follows the normal distribution. A random sample of 36 college students revealed that the mean number of movies watched last month was 6.2. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?