subject
Mathematics, 04.11.2020 01:40 rosepotato789

1.) A recent study by Educator Magazine was conducted to determine the amount of time students spend on homework. A random sample of 30 students were asked for the number of hours they spend doing homework every night. This gave a sample mean of 3.7 hours with sample standard deviation 1.5 hours. a.) Find the point estimate for the population mean (i. e. sample mean).

b.) Find the standard deviation of the sample.

c.) Find the sample size.

d.) Find the margin of error for a 95% confidence interval.

e.) Find a 95% confidence interval.

F. Which of the following are correct interpretation(s) of the interval from part (d)? (Highlight your response)

a. 95% of the students in the sample will spend the number of hours doing homework based on the computed confidence interval.

b. 95% confident the sample mean for the number of student homework hours every night is within the calculated confidence interval.

c. 95% confident that the true population mean for the number of student homework hours every night is within the calculated confidence interval.

d. 95% of the student population will spend the number of hours doing homework based on the computed confidence interval.

G. After having constructed the confidence interval in the first part of the problem, you are dissatisfied with its size. Which of the following are acceptable ways to decrease the width of the confidence interval? (Highlight your response)

a. Decrease the confidence level.
b. Increase the confidence level.
c. Decrease the sample size.
d. Increase the sample size.
e. (a) or (d)
f. (b) or (c)

The average monthly cell phone bill was reported to be $50 by the U. S. Wireless Industry in 2010. A recent sample from a large cell phone company found the following monthly cell phone charges (in dollars) from ten of their customers:

55.83, 49.88, 62.98, 70.42, 60.47, 52.45, 49.20, 50.02, 58.60, 51.29

a.) Find the point estimate for the population mean (i. e. sample mean).

b.) Find the standard deviation of the sample.

c.) Find the sample size.

d.) Find the margin of error for a 99% confidence interval.

e.) Find a 99% confidence interval for the mean number of hours all students spend working on homework.

f.) Interpret the confidence interval.

g.) Based on your confidence interval, is there evidence that the average phone bill has increased from $50?

ansver
Answers: 1

Other questions on the subject: Mathematics

image
Mathematics, 22.06.2019 02:10, icashaypabozp
Iknow the answer but the calculator doesn't seem to give the right one
Answers: 1
image
Mathematics, 22.06.2019 03:00, ernestsbaby6181
Crickets can jump with a vertical velocity of up to 14 ft/s. which equation models the height of such a jump, in feet, after t seconds? h(t) = –16t2 + v0t + h0 h(t) = –16t2 + v0t + 14 h(t) = –16t2 + 14t h(t) = –16t2 + 14t + 14 what is the maximum height the cricket reaches? round to the nearest thousandth. h = feet
Answers: 1
image
Mathematics, 22.06.2019 03:30, jarrettashlyn
Which lines are parallel? justify your answer. lines p and q are parallel because same side interior angles are congruent. lines p and q are parallel because alternate exterior angles are congruent lines l and m are parallel because same side interior angles are supplementary lines l and m are parallel because alternate interior angles are supplementary.
Answers: 2
image
Mathematics, 22.06.2019 05:30, 0gNanaa
Robert plans to make a box-and-whisker plot of the following set of data. 27, 14, 46, 38, 32, 18, 21 which of the following should robert's box-and-whisker plot look like?
Answers: 1
You know the right answer?
1.) A recent study by Educator Magazine was conducted to determine the amount of time students spend...

Questions in other subjects:

Konu
Mathematics, 17.05.2021 21:50