An SRS of 450 high school seniors gained an average of x = 20 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation o = 49. You can find the critical values to three decimal places by using the last row in table C. (a) Find a 95% confidence interval for the mean change in score u in the population of all high school seniors. (Enter youn answers rounded to two decimal places.) lower bound of confidence interval:

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An SRS of 450 high school seniors gained an average of x = 20 points in their second attempt at the SAT Mathematics
exam. Assume that the change in score has a Normal distribution with standard deviation o = 49.
You can find the critical values to three decimal places by using the last row in table C.
(a) Find a 95% confidence interval for the mean change in score u in the population of all high school seniors. (Enter your
answers rounded to two decimal places.)
lower bound of confidence interval:
upper bound of confidence interval:
Question Source: Moore, The Basic Practice Of Statistics, &e Publisher W.H. Free
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Transcribed Image Text:Attempt: An SRS of 450 high school seniors gained an average of x = 20 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation o = 49. You can find the critical values to three decimal places by using the last row in table C. (a) Find a 95% confidence interval for the mean change in score u in the population of all high school seniors. (Enter your answers rounded to two decimal places.) lower bound of confidence interval: upper bound of confidence interval: Question Source: Moore, The Basic Practice Of Statistics, &e Publisher W.H. Free dantect us help about vs cafeers privacypoloy 4:39 PM 11/12/2020 |耳 回 a %23 2)
(b) What is the margin of error for 95% ? (Enter your answer rounded to two decimal places.)
margin of error:
(c) Suppose we had an SRS of just 100 high school seniors. What would be the margin of error for 95% confidence? (Enter
your answer rounded to three decimal places.)
margin of error:
Question Source: Moore, The Basic Practice Of Statistics, de Publisher: W.H. Freeman
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Transcribed Image Text:(b) What is the margin of error for 95% ? (Enter your answer rounded to two decimal places.) margin of error: (c) Suppose we had an SRS of just 100 high school seniors. What would be the margin of error for 95% confidence? (Enter your answer rounded to three decimal places.) margin of error: Question Source: Moore, The Basic Practice Of Statistics, de Publisher: W.H. Freeman careers privacy poicy terms of use contact us heip 4:39 PM a # メ 11/12/2020 dele insert prt sc f9 18 144 ace
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