A sample consists of 75 TV sets purchased several years ago. The replacement times of those...

A sample consists of 75 TV sets purchased several years ago. The replacement times of those TV sets have a mean of 8.2 years. Assume σ= 1.1 years. Find the 95% confidence interval.
Why are you finding a confidence interval for Question 1?
A random sample of 61 Foreign Language movies made in the last 10 years has a mean length of 135.7 minutes with a standard deviation of 13.7 minutes. Construct a 95% confidence interval.
For items 1 and 3, you are constructing a confidence interval. What is the critical difference in the construction of those intervals?

Expert Solution

orchestra answered 2 years ago

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a...

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. (Change the final answer to a % and keep 2 decimal places) a) Find the probability that a randomly selected TV set will have a replacement time between 9.5 and 10.5 years. (Include diagram) b) Find the probability that 35 randomly selected TV sets will have a mean replacement time less than 8.0 years. (Include diagram)

4. Replacement times for TV sets are normally distributed with a mean of 8.2 years and...

4. Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. (Change the final answer to a % and keep 2 decimal places) a) Find the probability that a randomly selected TV set will have a replacement time between 9.5 and 10.5 years. (Include diagram) b) Find the probability that 35 randomly selected TV sets will have a mean replacement time less than 8.0 years. (Include diagram)

Replacement time for TV sets are normally distributed with a mean of 7.2 years and a...

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