Asked by Ray
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 463 students was x = 118 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 99% confidence interval for the mean study time of all first-year students.
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 99% confidence interval for the mean study time of all first-year students.
Answers
Answered by
PsyDAG
95% = mean ± 2.575 SEm
SEm = SD/√n
I'll let you do the calculations.
SEm = SD/√n
I'll let you do the calculations.
Answered by
Jason
Suppose x has a distribution with μ = 11 and σ = 5.
(a) If a random sample of size n = 45 is drawn, find μx, σ x and P(11 ≤ x ≤ 13). (Round σx to two decimal places and the probability to four decimal places.)
(a) If a random sample of size n = 45 is drawn, find μx, σ x and P(11 ≤ x ≤ 13). (Round σx to two decimal places and the probability to four decimal places.)
Answered by
PsyDAG
It is 99%, sorry for the typo.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.