Ten years ago the mean Math SAT score of all high school students who took the e

Question

Ten years ago the mean Math SAT score of all high school students who took the exam in a small high school was 490, with a standard deviation of 80. This year, a boxplot of the scores of a random sample of 25 students in the high school who took the exam is given on the next page. The mean score of these students is 530. We assume the population standard deviation continues to be 80. To determine if the is evidence that the scores in the district have improved, the hypotheses

Ho: u=490, Ha:u>490

are tested using the z statistic. With the P-value you find, it may be concluded:

a) at the 5% significance level, you have proved the Ho is false

b) at the 5% significance level, you have proved that Ha is false

c) it would have been more appropriate to use a two-sided alternative

d) at the 5% significance level, you can reject Ho

Explanation / Answer

b) at the 5% significance level, you have proved that Ha is false

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.