A statistical study of 520 high school seniors showed that they gained an average of x = 11 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation o = 40. (Round your answers to two decimal places.) (a) Find a 90% confidence interval foru based on this sample. to (b) What is the corresponding margin of error for the 90% confidence interval? (c) Suppose we had a statistical study of just 130 high school seniors. What would be the margin of error for 90% confidence interval?

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A Statistics: Assignment #7 - Es X
b calculator Search
how to find the standard de
b critical value for 68% confide X
A Statdisk Online
https://www.webassign.net/web/Student/Assignment-Responses/submit?dep=28291119&tags=Dautosave#question380921...
A
A statistical study of 520 high school seniors showed that they gained an average of x = 11 points in their second attempt at the SAT Mathematics exam. Assume that the change in score
has a Normal distribution with standard deviation a = 40. (Round your answers to two decimal places.)
(a) Find a 90% confidence interval for u based on this sample.
to
(b) What is the corresponding margin of error for the 90% confidence interval?
(c) Suppose we had a statistical study of just 130 high school seniors. What would be the margin of error for 90% confidence interval?
MY NOTES
Transcribed Image Text:A Statistics: Assignment #7 - Es X b calculator Search how to find the standard de b critical value for 68% confide X A Statdisk Online https://www.webassign.net/web/Student/Assignment-Responses/submit?dep=28291119&tags=Dautosave#question380921... A A statistical study of 520 high school seniors showed that they gained an average of x = 11 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation a = 40. (Round your answers to two decimal places.) (a) Find a 90% confidence interval for u based on this sample. to (b) What is the corresponding margin of error for the 90% confidence interval? (c) Suppose we had a statistical study of just 130 high school seniors. What would be the margin of error for 90% confidence interval? MY NOTES
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