Hugo, a pitcher, claims that his pitch speed is more than 48 miles per hour, on average. Several of his teammates do not believe him, so he decides to "do a" hypothesis test, at a 5% significance level, to persuade them. He throws 15 pitches, collects the proper data, and works through the testing procedure: H0: 48; Ha: >48 =0.05 (significance level) The test statistic is

5448/(5)sqrt15=4.65

The critical value is z0.05=1.64.

Conclude whether to reject or not reject H0, and interpret the results.

Select the correct answer below:

Reject H0. At the 5% significance level, the test results are not statistically significant and at best, provide weak evidence against the null hypothesis.

Reject H0. At the 5% significance level, the data provide sufficient evidence to conclude that the mean speed is more than 48 miles per hour.

Do not reject H0. At the 5% significance level, the test results are not statistically significant and at best, provide weak evidence against the null hypothesis.

Do not reject H0. At the 5% significance level, the data provide sufficient evidence to conclude that the mean speed is more than 48 miles per hour.