"2. A NAPA Auto Parts supplier wants information about how long car owners plan to keep their cars. A simple random sample of 24 car owners had a mean of 7.01 years and a standard deviation of 3.74 years (based on data from a Roper poll). Assume that the sample is drawn from a normally distributed population. Find and interpret a 95% confidence interval estimate of the population mean."

The 95% confidence interval estimate of the population mean is between 5.51 and 8.51 years. This means that we are 95% sure that the true mean time that car owners plan to keep their cars is between 5.51 and 8.51 years.

Step-by-step explanation:

We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of .

So it is z with a pvalue of , so

Now, find M as such

In which is the standard deviation of the population and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 7.01 - 1.50 = 5.51 years.

The upper end of the interval is the sample mean added to M. So it is 7.01 + 1.50 = 8.51 years.

The 95% confidence interval estimate of the population mean is between 5.51 and 8.51 years. This means that we are 95% that the true mean time that car owners plan to keep their cars is between 5.51 and 8.51 years.

hi,

i'm 75% sure the answer is 1,1 to both lines.

have a great day

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.