two brands of firelog (duraheat and everflame) are tested to see which on burns longer. a sample of 22 duraheat logs burns for an average of 192 minutes

In a random sample of 22 ​people, the mean commute time to work was 32.1 minutes...

In a random sample of 22 ​people, the mean commute time to work was 32.1 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 99​% confidence interval for the population mean μ. What is the margin of error of μ​? Interpret the results.

The waiting times (in minutes) of a random sample of 22 people at a bank have...

The waiting times (in minutes) of a random sample of 22 people at a bank have a mean of 8.2 minutes and a standard deviation of 3.6 minutes. Assume the population has a normal distribution. a. Construct, by hand, a 99% confidence interval for the standard deviation of all wait times at this bank. b. Interpret your confidence interval in context of the data.

In a random sample of 28 ​people, the mean commute time to work was 33.6 minutes...

In a random sample of 28 ​people, the mean commute time to work was 33.6 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 99​% confidence interval for the population mean μ. What is the margin of error of μ​? Interpret the results.

In a random sample of 18 ​people, the mean commute time to work was 32.4 minutes...

In a random sample of 18 ​people, the mean commute time to work was 32.4 minutes and the standard deviation was 7.2 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 99​% confidence interval for the population mean mu. What is the margin of error of mu​? Interpret the results.

A research council wants to estimate the mean length of time (in minutes) that the average...

A research council wants to estimate the mean length of time (in minutes) that the average U.S. adult spends watching television using digital video recorders (DVR’s) each day. To determine the estimate, the research council takes random samples of 35 U.S. adults and obtains the following times in minutes. 24 27 26 29 33 21 18 24 23 34 17 15 19 23 25 29 36 19 18 22 16 45 32 12 24 35 14 40 30 19 14...

A sample of 100 students showed an average commuting time of 45 minutes and a standard...

A sample of 100 students showed an average commuting time of 45 minutes and a standard deviation of 20 minutes. You want to test at 99% level of confidence whether the mean commuting time is different from 40 minutes. Compute the p-value for this test. (NOTE: USE 4 DECIMAL DIGITS)

A research council wants to estimate the mean length of time (in minutes) that the average...

A research council wants to estimate the mean length of time (in minutes) that the average U.S. adult spends watching television using digital video recorders (DVR’s) each day. To determine the estimate, the research council takes random samples of 35 U.S. adults and obtains the following times in minutes. 24 27 26 29 33 21 18 24 23 34 17 15 19 23 25 29 36 19 18 22 16 45 32 12 24 35 14 40 30 19 14...

A research council wants to estimate the mean length of time (in minutes) that the average...

A research council wants to estimate the mean length of time (in minutes) that the average U.S. adult spends watching television using digital video recorders (DVR’s) each day. To determine the estimate, the research council takes random samples of 35 U.S. adults and obtains the following times in minutes. 24 27 26 29 33 21 18 24 23 34 17 15 19 23 25 29 36 19 18 22 16 45 32 12 24 35 14 40 30 19 14...

Suppose that the average trip time from Oak Park to UIC on the Blue line is...

Suppose that the average trip time from Oak Park to UIC on the Blue line is 22 minutes and that the standard deviation of the population is 16 minutes (sigma=16). We are interested to know whether the average trip time on Thursdays is longer. We study a sample of 49 trips on Thursdays and the average is 23.75 minutes. Execute a hypothesis test at alpha=5% that the average trip time on Thursdays is longer (that is, that it requires a...

(Still focusing on the study that found Americans worked an average of 2,070 minutes per week)....

(Still focusing on the study that found Americans worked an average of 2,070 minutes per week). Without any prior expectations, you want to see if entrepreneurs work different amounts of time per week than the national average. You find in a sample of 12 entrepreneurs, the average amount worked per week was 4,200 minutes with a standard deviation of 1,020 minutes. Use a confidence interval (where α = .001) to determine if there is a significant difference in amount of...