![Mathematics](/tpl/images/cats/mat.png)
Mathematics, 20.11.2019 16:31, coolman5999alt
Abank wonders whether omitting the annual credit card fee for customers who charge at least $2400 in a year would increase the amount charged on its credit card. the bank makes this offer to an srs of 250 of its existing credit card customers. it then compares how much these customers charge this year with the amount that they charged last year. the mean increase is $342, and the standard deviation is $108.
(a) is there significant evidence at the 1% level that the mean amount charged increases under the no-fee offer? state math notationand math notation and carry out a t-test.
(b) give a 95% confidence interval for the mean amount of the increase.
(c) the distribution of the amount charged is skewed to the right, but outliers are prevented by the credit limit that the bank enforces on each card. use of the t procedures is justified in this case even though the population distribution is not normal. explain why.
![answer](/tpl/images/cats/otvet.png)
Answers: 1
Other questions on the subject: Mathematics
![image](/tpl/images/cats/mat.png)
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 21:10, samiam61
Which question is not a good survey question? a. don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d. are you happy with the availability of electronic products in your state?
Answers: 2
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 21:50, elsauceomotho
Which value of y will make the inequality y< -1 false?
Answers: 2
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 23:40, thetudent41
Let x = a + bi and y = c + di and z = f + gi. which statements are true?
Answers: 1
Do you know the correct answer?
Abank wonders whether omitting the annual credit card fee for customers who charge at least $2400 in...
Questions in other subjects:
![Konu](/tpl/images/cats/informatica.png)
![Konu](/tpl/images/cats/biologiya.png)
Biology, 31.08.2019 19:00
![Konu](/tpl/images/cats/en.png)
![Konu](/tpl/images/cats/informatica.png)
![Konu](/tpl/images/cats/en.png)
English, 31.08.2019 19:00
![Konu](/tpl/images/cats/fizika.png)
Physics, 31.08.2019 19:00
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/istoriya.png)
![Konu](/tpl/images/cats/himiya.png)
![Konu](/tpl/images/cats/istoriya.png)
History, 31.08.2019 19:00