A simple random sample of 64 second-graders in one large school district was given a standardized math skills test. The

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A Simple Random Sample Of 64 Second Graders In One Large School District Was Given A Standardized Math Skills Test The 1 (41.48 KiB) Viewed 25 times

A simple random sample of 64 second-graders in one large school district was given a standardized math skills test. The sample mean score was 54 and the sample standard deviation was 10. The nationwide average score on the test was 51. The district superintendent wants to know whether the second-graders in her district have better math skills than the national average. Let the level of significance a = .05. Part 1. The parameter in this scenario is the mean test score of all of the second-graders in the district. What is the symbole we use to denote this parameter? O A. H1-H2 OB. ос. x OD. P Part 2. Which is the appropriate set of hypotheses? O A. HOPI = 54 vs. Hy > 54 OB. Ho H-H2 = 0 vs. H7:- H2 > 0 OC. HOPI = 51 vs. Hy : >51 OD. HOH-H2 = 51 vs. H,:- H2>51 Part 3. This hypothesis test is: O A Two-tailed OB. Right-tailed O C. Left-tailed Part 4. What is the value of the test statistic? (Decimal only, one decimal place) Part 5. Which distribution should be used to calculate the p-value? O A. Normal distribution with a mean of 51 and standard deviation of 10 OB. t distribution with 64 degrees of freedom O c. t distribution with 63 degrees of freedom OD. Standard normal distribution