Question

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The final scores of games of a certain sport were compared against the final point spreads established by oddsmakers. The difference between the game outcome and point spread​(called a​ point-spread error) was calculated for 225 games. The sample mean and sample standard deviation of the​ point-spread errors are overbarx=1.4 and s=11.3. Use this information to test the hypothesis that the true mean​ point-spread error for all games is larger than0. Conduct the test at α=0.10 and interpret the result.

Determine the null and alternative hypotheses. Choose the correct answer below.

A.H0​:μ0=0

Ha​: μ 0 > 0

Your answer is correct.

B. H0​:mu s≠0

Ha​:μ 0= 0

C. H0​:μ 0 = 0

Ha​:μ 0<0

D. H0​: μ0=0

Ha​:μ ≠ 0

Find the test statistic.

z = ________​(Round to two decimal places as​ needed.)

Answer 1