Loading in 5 sec....

AP Statistics: Section 12.1 BPowerPoint Presentation

AP Statistics: Section 12.1 B

- 95 Views
- Uploaded on
- Presentation posted in: General

AP Statistics: Section 12.1 B.

AP Statistics: Section 12.1 B

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Example: A bank wonders if omitting the annual credit card fee for customers who charge at least $2400 a year would increase the amount that customers charge on its credit cards. The bank makes this offer to a SRS of 200 of its credit card customers. It then compares the amount these customers charged this year to the amount they charged last year. The mean increase is $332 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?

b) Construct and interpret a 99% confidence interval for the mean amount of the increase omitting the annual credit card fee for customers who charge at least $2400 a year would increase the amount that customers charge on its credit cards.

c) Does our work in parts a & b show that omitting the annual credit card fee for customers who charge at least $2400 a year caused an increase the amount that customers charge on its credit cards?

The t procedures are robust against non-Normality of the population except when _________ or _________________ are present. (Skewness is more serious than other kinds of non-Normality). Review the guidelines in the box “Using the t-procedures” on page 655. As the sample size increases, the ______ ensures that the distribution of the sample mean becomes more nearly Normal and the t-distribution becomes more accurate for calculating p-values.

The power of a statistical test measures its ability to detect deviations from the ____. The power of the one-sample t -test against a specific alternative value of the population mean is the probability that the test will _____________ when the mean has the alternative value.