Mathematics
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
Answers: 1

Other questions on the subject: Mathematics

image
Mathematics, 20.06.2019 18:04, jalenJohnson6t
George is 187 cm tall. his son, ralph, is 142 cm tall. who casts the longer shadow. george when the sun is 65Β° above the horizon, or ralph when the sun is 56Β° above the horizon? how much longer? (nearest centimeter)
Answers: 2
image
Mathematics, 21.06.2019 16:20, emj617
Match each statement with its corresponding value for the system below: y = -2(3)x and y = 9x - 2 1. the number of points of intersection. -2 2. the x-coordinate of the solution. 1 3. the y-coordinate of the solution. 0
Answers: 3
image
Mathematics, 21.06.2019 16:30, macenzie26
What could explain what happened when the time was equal to 120 minutes
Answers: 2
image
Mathematics, 21.06.2019 16:30, neilaamusic6966
When only separate discreet points are graphed it is called?
Answers: 3
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
Mathematics, 18.06.2021 22:20
Konu
Mathematics, 18.06.2021 22:20