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1. The manufacturer of a new line of ink-jet printers would like to include as part of its advertising the number of pages a user can expect from a

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1. The manufacturer of a new line of ink-jet printers would like to include as part of its advertising the number of pages a user can expect from a print cartridge. A sample of 10 cartridges revealed the following number of pages printed.

3,580 2,560 2,550 2,500 2,730 2,610 2,440 3,540 3,060 2,950

(a) What is the point estimate of the population mean? (Round your answer to the nearest whole number.)

Estimated population mean


(b) Develop a 90 percent confidence interval for the population mean. (Round your answers to 2 decimal places.)

Confidence interval for the population mean is between and .




2.
In a poll to estimate presidential popularity, each person in a random sample of 1,030 voters was asked to agree with one of the following statements:

1. The president is doing a good job.
2. The president is doing a poor job.
3. I have no opinion.

A total of 575 respondents selected the first statement, indicating they thought the president was doing a good job.

(a) Construct a 95 percent confidence interval for the proportion of respondents who feel the president is doing a good job. (Round your answers to 3 decimal places.)

Confidence interval for the proportion is up to



3.
The First National Bank of Wilson has 720 checking account customers. A recent sample of 50 of these customers showed 22 to have a Visa card with the bank.

Construct the 98 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank. (Round your answers to 3 decimal places.)


Confidence interval for the proportion of checking account customers who have a Visa card with the bank is and



4.
Dylan Jones kept careful records of the fuel efficiency of his new car. After the first eleven times he filled up the tank, he found the mean was 23.4 miles per gallon (mpg) with a sample standard deviation of 1.4 mpg.

(a) Compute the 95 percent confidence interval for his mpg. (Round your answers to 3 decimal places.)

The confidence interval is between and .


(b) How many times should he fill his gas tank to obtain a margin of error below 0.15 mpg? (Round your answer to the nearest whole number.)

Number of times

1. The manufacturer of a new line of ink-jet printers would like to include as part of its advertising the number of pages a user can expect from a print cartridge. A sample of 10 cartridges revealed the following number of pages printed. 3,580 2,560 2,550 2,500 2,730 2,610 2,440 3,540 3,060 2,950 (a) What is the point estimate of the population mean? (Round your answer to the nearest whole number.) Estimated population mean (b) Develop a 90 percent confidence interval for the population mean. (Round your answers to 2 decimal places.) Confidence interval for the population mean is between and . 2. In a poll to estimate presidential popularity, each person in a random sample of 1,030 voters was asked to agree with one of the following statements: 1. The president is doing a good job. 2. The president is doing a poor job. 3. I have no opinion. A total of 575 respondents selected the first statement, indicating they thought the president was doing a good job. (a) Construct a 95 percent confidence interval for the proportion of respondents who feel the president is doing a good job. (Round your answers to 3 decimal places.) Confidence interval for the proportion is up to 3. The First National Bank of Wilson has 720 checking account customers. A recent sample of 50 of these customers showed 22 to have a Visa card with the bank. Construct the 98 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank. (Round your answers to 3 decimal places.) Confidence interval for the proportion of checking account customers who have a Visa card with the bank is and 4. Dylan Jones kept careful records of the fuel efficiency of his new car. After the first eleven times he filled up the tank, he found the mean was 23.4 miles per gallon (mpg) with a sample standard deviation of 1.4 mpg. (a) Compute the 95 percent confidence interval for his mpg. (Round your answers to 3 decimal places.) The confidence interval is between and . (b) How many times should he fill his gas tank to obtain a margin of error below 0.15 mpg? (Round your answer
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to the nearest whole number.) Number of times
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1. The manufacturer of a new line of ink-jet printers would like to include as part of its advertising the number of
pages a user can expect from a print cartridge. A sample of 10 cartridges...

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