A survey of a random sample of 1000 smartphone owners found that the mean daily time...
Homework Answers
We are 95% confident that, population mean daily time spent communicating on a smart phone is between 130.1 minutes to 132.7 minutes.
We have calculated confidence interval is based on sample of 1000 smartphone owners.
We can use this sample result and assume that about population data of smartphone owners.
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survey of a random sample of 1000 smartphone owners found that the
mean daily time...
A survey taken several years ago found that the average time a person spent reading the...
A survey taken several years ago found that the average time a person spent reading the local daily newspaper was 10.8 minutes. The standard deviation of the population was 3 minutes. To see whether the average time had changed since the newspaper's format was revised, the newspaper editor surveyed 36 individuals. The average time that the 36 people spent reading the paper was 12.2 minutes. (a) At α = 0.02, is there a change in the average time an individual...
A survey taken several years ago found that the average time a person spent reading the...
A survey taken several years ago found that the average time a person spent reading the local daily newspaper was 10.8 minutes. The standard deviation of the population was 3 minutes. To see whether the average time had changed since the newspaper's format was revised, the newspaper editor surveyed 36 individuals. The average time that the 36 people spent reading the paper was 12.2 minutes. (a) At α = 0.02, is there a change in the average time an individual...
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A random sample of fifty-two 200-meter swims has a mean time of 3.59 minutes and the...
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6.2.19-T Question Help In a random sample of four microwave ovens, the mean repair cost was $85.00 and the standard deviation was $13.00. 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 99% confidence interval for the population mean μ is (DD (Round to two decimal places as needed.) 6.2.21-T Question Help In a random sample...
A random sample of fifty-four 200-meter swims has a mean time of 3.125 minutes and a...
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In a random sample of 8 people, the mean commute time to work was 34.5 minutes and the standard deviation was 7.3 minutes. A 95% confidence interval using the t-distribution was calculated to be (28.4.40.6). After researching commute times to work, it was found that the population standard deviation is 9.4 minutes. Find the margin of error and construct a 95% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare...
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6.2.19-T Question Help In a random sample of four microwave ovens, the mean repair cost was $85.00 and the standard deviation was $13.00. 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 99% confidence interval for the population mean μ is (DD (Round to two decimal places as needed.) 6.2.21-T Question Help In a random sample...
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