Question

J.J.Bean sells a wide variety of outdoor equipment and clothing. The company sells both through mail order and via the internet. Random samples of sales receipts were studied for mail-order sales and internet sales, with the total purchase being recorded for each sale. A random sample of 16 sales receipts for mail-order sales results in a mean sale amount of $92.10 with a standard deviation of $26.75. A random sample of 11 sales receipts for internet sales results in a mean sale amount of $77.30 with a standard deviation of $23.75. Using this data, find the 98% confidence interval for the true mean difference between the mean amount of mail-order purchases and the mean amount of internet purchases. Assume that the population variances are not equal and that the two populations are normally distributed.

Step 1 of 3:

Find the point estimate that should be used in constructing the confidence interval.

Step 2 of 3:

Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.

Step 3 of 3:

Construct the 98% confidence interval. Round your answers to two decimal places.

Answer #1

J.J.Bean sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 16 sales receipts for mail-order sales
results in a mean sale amount of $83.10 with a standard deviation
of $25.75. A random sample of 12 sales receipts for internet sales
results in a...

K.Brew sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 8 sales receipts for mail-order sales
results in a mean sale amount of $88.70 with a standard deviation
of $26.75. A random sample of 17 sales receipts for internet sales
results in a...

J.J.Bean sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 10 sales receipts for mail-order sales
results in a mean sale amount of $79.20 with a standard deviation
of $18.75. A random sample of 16 sales receipts for internet sales
results in a...

K.Brew sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 18 sales receipts for mail-order sales
results in a mean sale amount of $85.60$85.60 with a standard
deviation of $26.75 A random sample of 12 sales receipts for
internet sales results in a...

K.Brew sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 9 sales receipts for mail-order sales
results in a mean sale amount of $87.60 with a standard deviation
of $27.75. A random sample of 16 sales receipts for internet sales
results in a...

J.J.Bean sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 17 sales receipts for mail-order sales
results in a mean sale amount of $78.60 with a standard deviation
of $24.75. A random sample of 9 sales receipts for internet sales
results in a...

Eddie Clauersells a wide variety of outdoor equipment and
clothing. The company sells both through mail order and via the
internet. Random samples of sales receipts were studied for
mail-order sales and internet sales, with the total purchase being
recorded for each sale. A random sample of 11sales receipts for
mail-order sales results in a mean sale amount of $81.20with a
standard deviation of $23.75. A random sample of 19sales receipts
for internet sales results in a mean sale amount...

K.Brew sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 10 sales receipts for mail-order sales
results in a mean sale amount of $87.30 with a standard deviation
of $26.25. A random sample of 20 sales receipts for internet sales
results in a...

K.Brew sells a wide variety of outdoor equipment and clothing.
The company sells both through mail order and via the internet.
Random samples of sales receipts were studied for mail-order sales
and internet sales, with the total purchase being recorded for each
sale. A random sample of 10 sales receipts for mail-order sales
results in a mean sale amount of $76.90 with a standard deviation
of $21.75. A random sample of 14 sales receipts for internet sales
results in a...

Land's Bend sells a wide variety of outdoor equipment and
clothing. The company sells both through mail order and via the
internet. Random samples of sales receipts were studied for
mail-order sales and internet sales, with the total purchase being
recorded for each sale. A random sample of 12 sales receipts for
mail-order sales results in a mean sale amount of $89.60 with a
standard deviation of $17.75. A random sample of 18 sales receipts
for internet sales results in...

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