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 3points with 99% confidence assuming s = 14.7 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease inconfidence affect the sample size required?Click the icon to view a partial table of critical values.subjects. (Round up to the nearest subject.)subjects. (Round up to the nearest subject.)A 99% confidence level requiresA 95% confidence level requiresHow does the decrease in confidence affect the sample size required?O A. Decreasing the confidence level increases the sample size needed.B. The sample size is the same for all levels of confidence.OC. Decreasing the confidence level decreases the sample size needed....

Answered: A doctor wants to estimate the mean HDL…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Identify the data value corresponding to the indicated percentile. The amount of sleep an adult gets per day is normally distributed with a mean of 7 hours and a standard deviation of 1.5 hours. Five percent of adults sleep more than how many hours per day?
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In a public health study, a histogram was plotted showing the number of cigarettes smoked per day by each subject, as shown below. The numbers on top of each bar represent its heights. You may assume that the values are spread uniformly across each interval. What is the third quartile (or the 75 percentile) of the values? (3.5) (1.5) ( 1.5) (0.5) 10 20 40 80 Number of cigarettes between 12 and 13 cigarettes 20 cigarettes O between 36 and 37 cigarettes 60 cigarettes between 22 and 23 cigarettes 4. 3. % per cigarette
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We have provided simple data sets for you to practice finding the descriptive measures discussed in this section. For each data set, a. obtain the quartiles. b. determine the interquartile range. c. find the five-number summary. 1, 2, 3, 4
A study involving stress is conducted among the students on a college campus. The stress scores follow a uniform distribution with the lowest stress score equal to one and the highest equal to five. Using a sample of 55 students, find: Find the 80th percentile for the mean of 55 scores. Round to four decimal places.
The distribution of heights in a population of women is approximately normal. Sixteen percent of the women have heights less than 62 inches. About 97.5% of the women have heights less than 71 inches. Use the empirical rule to estimate the mean and standard deviation of the heights in this population. Mean: K inches Standard Deviation: inches
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