The next four questions refer to data on the number of emails considered importa
ID: 3072331 • Letter: T
Question
The next four questions refer to data on the number of emails considered important received by Whitey college students within a 24-hour period. A random sample was collected by surveying students about the number of received emails they considered important within a 24-hour period. Students were also surveyed on whether they active Facebook users.
1) Which of the following best describes a 95% confidence interval for the average number of important emails received by a Whitey student within a 24-hour period?
2) Which of the following is the best estimate for the proportion of Whitey students who actively use Facebook:
Q3. What is the best estimate for the standard deviation of the number of important emails received in a 24-hour period by a Whitey student who is an active Facebook user?
Q4 Which of the following is the best estimate for the proportion of those who receive at most one important e-mail in a 24hour period (i.e., either zero or one important emails) among Whitey students who actively use Facebook?
a: 27% b: 73% c: 2.67 d: 278Explanation / Answer
Answer to question# 1)
The best way to interpret 95% confidence interval is as follows:
If several samples are taken 95% of them will contain the true mean number of important emails received by a Whitey student within 24 hour period
.
Answer to question# 2)
There are 278 active FB users out of total 382
Proportion = (278/382) *100
Proportion = 72..77% ~ 73%
.
Answer to question# 3)
The best estimate of standard deviation of active fb users I;
Use the excel function =stdev(range of values)
Press enter , we get standard deviation = 1.3096
.
Answer too question# 4)
Out of total 278 active users, 90 of them get either 0 or 1 important mails
Thus proportion = 90 /278 = 0.3237
This values lies between quarter and one third
Hence the second answer choice is correct
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.