SUBPARTS D,E,F Please. A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped...

SUBPARTS D,E,F Please.

A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped with a mean of

$9171

and a standard deviation of

$5539

Construct a 99% confidence interval for the mean of all such costs.

a. Find the critical value:

t Subscript alpha divided by 2 Baseline equals

2.093

(use 3 decimal places)

b. State the sample size: n =

(give a whole number)

c. Calculate the margin of error: E =

2,592

(round off to a whole number)

d. Give the confidence interval:

nothing

less than mu less thannothing

(round off to whole numbers)

e. An opponent of seat belt laws believes that seat belts actually cause more harm than good and claims that the mean hospital costs for accident victims who wore seat belts is more than $15,000. Does this data support his claim? Why or why not?

No, the upper confidence interval limit is less than $15,000

Yes, the lower confidence interval limit is greater than $15,000

No, the sample mean is about $15,000

Yes, the upper confidence interval limit is less than $15,000

f. If we were not told that the distribution appears to be bell-shaped, would we be able to calculate the margin of error using the same formula?

No, because the sample size is below 30

Yes, because the sample is random

Yes, because we can use any formula on any set of data

No, because the sample size is greater than 10

Jun 10, 2022

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SUBPARTS D,E,F Please. A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped...

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SUBPARTS D,E,F Please. A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be​ bell-shaped...

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SUBPARTS D,E,F Please. A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped...