AP Stats T Value

What is the expected value of the number of cars in a randomly selected household?

• 2.5

• 0.167

• 1.45

• 1

A study of a large local high school tried to determine the mean amount of money that each student had saved. The study surveyed a random sample of 97 AP students in the high school and found a mean savings of 4100 dollars with a standard deviation of 500 dollars. Would you use a One Sample z Interval or a One Sample t Interval for this situation?

• One Sample z Interval

• One Sample t Interval

A study of a large local high school tried to determine the mean amount of money that each student had saved. The study surveyed a random sample of 97 AP students in the high school and found a mean savings of 4100 dollars with a standard deviation of 500 dollars. What would be the critical value for a 90% confidence interval in this situation?

A study by the department of education of a certain state was trying to determine the mean SAT scores of the graduating high school seniors. The study examined the scores of a random sample of 25 graduating seniors and found the mean score to be 471 with a standard deviation of 83.

Would you use a one sample z interval or a one sample t interval in this situation?

• One Sample z Interval

• One Sample t Interval

• A

• B

• C

• D

• E

A study by the department of education of a certain state was trying to determine the mean SAT scores of the graduating high school seniors. The study examined the scores of a random sample of 25 graduating seniors and found the mean score to be 471 with a standard deviation of 83.

What would the critical value for a 98% confidence interval be in this situation?

A study of a local high school with 2,000 students tried to determine the mean number of text messages that each student sent per day. The study surveyed a random sample of 253 students in the high school and found a mean of 186 messages sent per day with a standard deviation of 65 messages.

Would you use a one sample z interval or a one sample t interval for this situation?

• One Sample z Interval

• One Sample t Interval

What is the value of the correlation coefficient?

• 0.891

• -0.891

• 0.875

• 0.943

• -0.943