The final scores of games of a certain sport were compared against the final poi

Question

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 220 games. The sample mean and sample standard deviation of the point-spread errors are x =1.2 and s 13.4. Use this information to test the hypothesis that the true mean point-spread error for all games is larger than 0, Conduct the test at = 0.01 and interpret the result. Determine the null and alternative hypotheses. Choose the correct answer below. A. Ho:Ho:0 HaHo:0 OD. Ho:Ho:0 C. Ho:Ho-0 Find the test statistic. z | (Round to two decimal places as needed.) Determine the rejection region. Choose the correct answer below. A. z> 2.33 orz

Explanation / Answer

The statistical software output for this problem is:

One sample Z summary hypothesis test:
: Mean of population
H0 : = 0
HA : > 0
Standard deviation = 13.4

Hypothesis test results:

Hence,

Hypotheses: Option D is correct.

z = 1.33

Rejection Region: Option E is correct.

Conclusion: Option B is correct.

Mean n Sample Mean Std. Err. Z-Stat P-value 220 1.2 0.90342782 1.3282744 0.092

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