A recent survey asked 64 CMU students, “In the past year, about how many books did...

A recent survey asked 64 CMU students, “In the past year, about how many books did your read?” The results indicated a mean of 16.8 books with a S.D. of 6,7 books.

a. What is the Standard Error of the estimate of the population mean?

b. What is the Margin of Error at a C.L. of 97%?

c. What is the right boundary of the C.I. at a C.L. of 97%?

d. At a 99% C.L., if the researcher wants to limit the error within 1.5 book range, what size of the sample is needed?

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

A recent Gallup poll asked 1006 Americans, “During the past year, about how many books, either...

A recent Gallup poll asked 1006 Americans, “During the past year, about how many books, either hardcover or paperback, did you read all or part of the way through?” Results of the survey indicated that x ¯ = 13.4 books and s = 16.6 books. Construct a 99% confidence interval for the true mean number of books Americans read either all or part of during the past year.

survey was conducted that asked 1026 people how many books they had read in the past...

survey was conducted that asked 1026 people how many books they had read in the past year. Results indicated that x overbar equals14.3 books and s equals 15.6 books. Construct a 96% confidence interval for the mean number of books people read. Interpret the interval.

A class survey in a large class for first-year college students asked, "About how many minutes...

A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 259 students was x⎯⎯⎯ = 147 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 65 minutes in the population of all first-year students at this university. Use the survey result to give a 95% confidence interval for the mean study time of...

A class survey in a large class for first‑year college students asked, “About how many hours...

A class survey in a large class for first‑year college students asked, “About how many hours do you study during a typical week?” The mean response of the 463 students was ?¯=13.7 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation ?=7.4 hours in the population of all first‑year students at this university. Regard these students as an SRS from the population of all first‑year students at this university. Does the study give...

A class survey in a large class for first-year college students asked, "About how many minutes...

A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 261 students was x¯¯¯x¯ = 130 minutes. Suppose that we know that the studey time follows a Normal distribution with standard deviation σσ = 65 minutes in the population of all first-year students at this university. Regard these students as an SRS from the population of all first-year students at this university....

A class survey in a large class for first-year college students asked, "About how many hours...

A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 427 students was x¯¯¯ = 12 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 7 hours in the population of all first-year students at this university. What is the 99% confidence interval (±0.001) for the population mean? Confidence interval is from ____to_____ hours.

A class survey in a large class for first-year college students asked, "About how many minutes...

A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 257 students was x¯¯¯x¯ = 140 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation σσ = 65 minutes in the population of all first-year students at this university. Use the survey result to give a 95% confidence interval for the mean study time of...

(16.19) A class survey in a large class for first-year college students asked, "About how many...

(16.19) A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 427 students was x¯¯¯ = 17 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 8 hours in the population of all first-year students at this university. What is the 99% confidence interval (±0.001) for the population mean? Confidence interval is from to hours.

A survey was conducted that asked 1008 people how many books they had read in the...

A survey was conducted that asked 1008 people how many books they had read in the past year. Results indicated that x overbarequals14.4 books and sequals16.6 books. Construct a 99% confidence interval for the mean number of books people read. Interpret the interval.

A survey was conducted that asked 1008 people how many books they had read in the...

Subjects