In order to estimate the average time spent on the computer terminals per student at a...

Question

Question

In order to estimate the average time spent on the computer terminals per student at a...

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours. Answer questions 7 - 9.

7. What is the standard error of the mean?

a. 7.50

b . 0.39

c. 2.00

d. 0.20

8. With a 0.95 probability, the margin of error is approximately

a. 0.39

b 1.96

c. 0.20

d. 1.64

9. If the sample mean is 9 hours, then the 95% confidence interval is

a. 7.04 to 10.96 hours

b. 7.36 to 10.64 hours

c. 7.80 to 10.20 hours

d. 8.61 to 9.39 hours

math Statistics-And-Probability

Add a comment Improve this question Transcribed image text

Answer 1

Answer #1

Add a comment

Answer 2

Similar Homework Help Questions

In order to estimate the average time spent on the computer terminals per student at a...

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours. If the sample mean is 9 hours, then the 95% confidence interval is approximately a. The 95% interval because it is a less accurate interval. The 95% interval because it is a less accurate interval. b. The 99% interval because...
Use Table 8.1, a computer, or a calculator to answer the following. Suppose a candidate for...

Use Table 8.1, a computer, or a calculator to answer the following. Suppose a candidate for public office is favored by only 47% of the voters. If a sample survey randomly selects 2,500 voters, the percentage in the sample who favor the candidate can be thought of as a measurement from a normal curve with a mean of 47% and a standard deviation of 1%. Based on this information, how often (as a %) would such a survey show that...
Please show the process 6. In developing an interval estimate for a population mean, the population...

Please show the process 6. In developing an interval estimate for a population mean, the population standard deviation σ was assumed to be 10. The interval estimate was 50.92 2.14. Had ơ equaled 20, the interval estimate would be a. 60.92 t 2.14 b. 50.92 12.14 c. 101.84 4.28 d. 50.92t 4.28 7. If the confidence level is reduced, the confidence interval a. widens. b. remains the same. C. narrows. d. disappears. 8. The zal value for a 95% confidence...

The time spent completing problem sets per week is normally distributed with a mean of 8...

The time spent completing problem sets per week is normally distributed with a mean of 8 hours and a standard deviation of 2 hours. What is the probability that at a randomly selected week, time spent on doing problem sets: a) will take more than 9 hours? b) will take less than 9.5 hours? c) will take less than 6 hours? If random samples of 25 weeks are taken, what proportion of the sample means: d) would be more than...
Time spent using e-mail per session is normally distributed, with mu equals μ=9 minutes and sigma...

Time spent using e-mail per session is normally distributed, with mu equals μ=9 minutes and sigma equals σ=2 minutes. Assume that the time spent per session is normally distributed. Complete parts (a) through (d). a. If you select a random sample of 25 sessions, what is the probability that the sample mean is between 8.8 and 9.2 minutes? (Round to three decimal places as needed.) b. If you select a random sample of 25 sessions, what is the probability that...
PLEASE ANSWER ALL QUESTIONS ! 1. The following sample observations were randomly selected: X Y 10...

PLEASE ANSWER ALL QUESTIONS ! 1. The following sample observations were randomly selected: X Y 10 4 5 6 6 5 4 7 3 7 What is the coefficient of correlation? Select one: a. 0.90 b. -0.46 c. -0.95 d. 0.82 2. The regression output from Excel indicates that the Significance F is 0.001. Does that mean there is a significant relationship? Select one: a. Yes, because it is small. b. Yes, because it is large. c. No, because it...

can you provide me with step to step workout . 6 With a sample size of 177, a 95% confidence interval for the heig...

can you provide me with step to step workout . 6 With a sample size of 177, a 95% confidence interval for the height of 9-year old male US children is (54.0, 54.8), Indicate which of the following is a true statement A. All samples of size 177 of the population of 9-year old male US children will generate confidence intervals of (54.0, 54.8). B. The probability is 0.05 that a randomly selected 9-year old male US child will be...
SCENARIO 13-9 It is believed that, the average numbers of hours spent studying per day (HOURS)...

SCENARIO 13-9 It is believed that, the average numbers of hours spent studying per day (HOURS) during undergraduate education should have a positive linear relationship with the starting salary (SALARY, measured in thousands of dollars per month) after graduation. Given below is the Excel output for predicting starting salary (7) using number of hours spent studying per day (X) for a sample of 51 students. NOTE: Only partial output is shown. Regression Statistics Multiple R 0.8857 0.7845 Adjusted R Square...
Question 2 A tire manufacturer claims that their tires have an average life of more than...

Question 2 A tire manufacturer claims that their tires have an average life of more than 12000 km. A random sample of 20 tires has an average life of 12110 km with a standard deviation of 185 hours. Assume that the life of tires is normally distributed. What is/are the critical value(s)? Use 0.05 Answer: 1.7291 Question 3 We estimate population parameters by using a) only point estimates deviation d) point and interval estimates Answer: d b) only interval estimates...

It is known that time spent partying per month by Kent State students is normal with...

It is known that time spent partying per month by Kent State students is normal with a mean of 46 hrs and standard deviation of 4 hrs. What is the probability that a randomly chosen Kent State student spends more than 49 hours partying per month? 1. 0 2. 0.0668 3. 0.8535 What is the probability that a randomly selected Kent State student spends less that 40 hours partying per month? 4. 0.2266 For which one of the following sets...

In order to estimate the average time spent on the computer terminals per student at a...

Homework Answers

Add Answer to:
In order to estimate the average time spent on the computer terminals per student at a...

Post as a guest

Earn Coins