The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 616 customers in Taco Bell's drive-through has a lower bound of 165.5 seconds and an upper bound of 167.7 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 616 customers? The mean service time from the 616 customers is seconds (Type an integer or a decimal. Do not round.)

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The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 616 customers in Taco Bell's drive-through has a lower bound
of 165.5 seconds and an upper bound of 167.7 seconds. Complete parts (a) through (c).
(a) What is the mean service time from the 616 customers?
The mean service time from the 616 customers is seconds
(Type an integer or a decimal. Do not round.)
Transcribed Image Text:The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 90% confidence interval that results from examining 616 customers in Taco Bell's drive-through has a lower bound of 165.5 seconds and an upper bound of 167.7 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 616 customers? The mean service time from the 616 customers is seconds (Type an integer or a decimal. Do not round.)
A survey was conducted that asked 1015 people how many books they had read in the past year. Results indicated that x = 11.1 books and s = 16.6 books. Construct a 90% confidence interval for the mean number of
books people read. Interpret the interval.
Click the icon to view the table of critical t-values.
Construct a 90% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice.
(Use ascending order. Round to two decimal places as needed.)
O A. If repeated samples are taken, 90% of them will have a sample mean between
and
B. There is a 90% probability that the true mean number of books read is between
and
C. There is 90% confidence that the population mean number of books read is between
and
Transcribed Image Text:A survey was conducted that asked 1015 people how many books they had read in the past year. Results indicated that x = 11.1 books and s = 16.6 books. Construct a 90% confidence interval for the mean number of books people read. Interpret the interval. Click the icon to view the table of critical t-values. Construct a 90% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to two decimal places as needed.) O A. If repeated samples are taken, 90% of them will have a sample mean between and B. There is a 90% probability that the true mean number of books read is between and C. There is 90% confidence that the population mean number of books read is between and
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