Question

Confidence Interval for a mean. For a sample of 35 students, assume the average grade on a statistics exam is 85 with a sample standard deviation of 8.43. 7 1 point Give a 95% confidence interval for the mean grade on the exam. For this question, give the lower bound. Round to two decimal places. Type your answer... 8 1 point Give a 95% confidence interval for the mean grade on the exam. For this question, give the upper bound. Round to two decimal places. Type your answer... 9 1 point How large a sample is needed if the sample mean grade is to be estimated with 90% confidence to within 2 points? Assume $\sigma = 12$. Type your answer...

          Confidence Interval for a mean.
For a sample of 35 students, assume the average grade on a statistics exam is 85
with a sample standard deviation of 8.43.
7 1 point
Give a 95% confidence interval for the mean grade on the exam. For this question,
give the lower bound. Round to two decimal places.
Type your answer...
8 1 point
Give a 95% confidence interval for the mean grade on the exam. For this question,
give the upper bound. Round to two decimal places.
Type your answer...
9 1 point
How large a sample is needed if the sample mean grade is to be estimated with 90% confidence to within 2 points? Assume $\sigma = 12$.
Type your answer...

$Confidence Interval for a mean. For a sample of 35 students, assume the average grade on a statistics exam is 85 with a sample standard deviation of 8.43. 7 1 point Give a 95% confidence interval for the mean grade on the exam. For this question, give the lower bound. Round to two decimal places. Type your answer... 8 1 point Give a 95% confidence interval for the mean grade on the exam. For this question, give the upper bound. Round to two decimal places. Type your answer... 9 1 point How large a sample is needed if the sample mean grade is to be estimated with 90% confidence to within 2 points? Assume $\sigma = 12$. Type your answer...$

Added by Daniel J.

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