Question- Hypothesis Tests for a Question 8, 10.3.33-P HW Score: $97.62 \%, 8.79$ of 9 points Part 6 of 9 Points: 0.79 of 1 Save
A math teacher claims that she has developed a review course that increases the scores of students on the math portion of a college entrance exam. Based on data from the College Board, scores are normally distributed with $\mu=518$. The teacher obtains a random sample of 2200 students, puts them through the review class, and finds that the mean math score of the 2200 students is 523 with a standard deviation of 118 . Complete parts (a) through (d) below.
Click the icon to view the t-Distribution Area in the Right Tail. A. No, because every increase in score is practically significant. B. Yes, because the score became more than $0.97 \%$ greater. C. No, because the score became only $0.97 \%$ greater D. Yes, because every increase in score is practically significant. (d) Test the hypothesis at the $\alpha=0.10$ level of significance with $n=400$ students. Assume that the sample mean is still 523 and the sample standard deviation is still 118 . Is a sample mean of 523 significantly more than 518 ? Conduct a hypothesis test using the P-value approach.
Find the test statistic. $\mathrm{t}_{0}=$ $\square$ (Round to two decimal places as needed.) $v$ an example Get more help - Clear all Check answer 3 Nov 24 10:09 INTL 붕