subject
Mathematics, 07.05.2021 22:50 ochoamiguel46

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 9 sales receipts for mail-order sales results in a mean sale amount of $83.10 with a standard deviation of $21.25. A random sample of 15 sales receipts for internet sales results in a mean sale amount of $97.10 with a standard deviation of $20.75. Using this data, find the 95% 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 critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

ansver
Answers: 2

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 17:00, rireneb
Convert 2000 swiss francs to dutch guilders
Answers: 1
image
Mathematics, 21.06.2019 23:00, dondre54
Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.
Answers: 1
image
Mathematics, 22.06.2019 04:30, alexisss23
Television viewing reached a new high when the global information and measurement company reported a mean daily viewing time of 8.35 hours per household. use a normal probability distribution with a standard deviation of 2.5 hours to answer the following questions about daily television viewing per household. a. what is the probability that a household views television between 4 and 10 hours a day? (to 4 decimals) b. how many hours of television viewing must a household have in order to be in the top 7% of all television viewing household? (to 2 decimals) c. what is the probability that a household views television more than 4 hours a day? (to 4 decimals)
Answers: 1
image
Mathematics, 22.06.2019 05:00, diana156
In 3 years, dianna will be 4 times as old as she was 33 years ago. how old is dianna now? translate the phrase "in 3 years" into algebraic terms.
Answers: 3
You know the right answer?
Land's Bend sells a wide variety of outdoor equipment and clothing. The company sells both through m...

Questions in other subjects: