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Mathematics, 18.04.2020 00:17, nakeytrag
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X Instructor-created question
HW Score: 45.93%, 5.51 of 12 pts
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A doctor wants to estimate the mean HDL cholesterol of all 20-to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3
points with 99% confidence assuming s = 14.2 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in
confidence affect the sample size required?
adebook
A 99% confidence level requires
subjects(Round up to the nearest subject.)
ultimedia Library
A 90% confidence level requires
subjects. (Round up to the nearest subject)
aface to the Student
How does the decrease in confidence affect the sample size required?
pols for Success
O A. Decreasing the confidence level decreases the sample size needed.
B. The sample size is the same for all levels of confidence.
OC. Decreasing the confidence level increases the sample size needed.
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Answers: 2
Mathematics, 21.06.2019 22:20, skyhighozzie
(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)
Answers: 2
Mathematics, 21.06.2019 23:30, jwbri
If the car had not hit the fence, how much farther would it have skidded? solve the skid-distance formula to find the extra distance that the car would have traveled if it had not hit the fence. round your answer to two decimal places. note that unit conversion is built into the skid distance formula, so no unit conversions are needed.
Answers: 2
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