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tykiabrown8111
18.04.2020 •
Mathematics
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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?
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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?
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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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Ответ:
The correct answer is:
P(male | buys lunch) = 0.4 and P(male) = 0.3.
Explanation:
If two events A and B are independent, then P(A|B) {read "probability of A given B} is equal to P(A).
There are 176+46 = 222 males. There are 254+264 = 518 females. This is a total of 222+518 = 740 people. This makes P(male) = 222/740 = 111/370 = 3/10.
There are 176+264 = 440 people that buy lunch. Out of these, 176 are male. This makes P(male | buy lunch) = 176/440 = 88/220 = 8/20 = 4/10. This is because we consider only those who buy their lunch, and look at the probability that someone in that group is male.
Since P(male | buy lunch) = 4/10 ≠ P(male) = 3/10, these events are not independent.