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A physician employed by a large corporation believes that due to an increase in sedentary life in the past decade, middle-age men have become fatter. In 1995, the corporation measured the percentage of fat in their employees. For the middle-age men, the scores were normally distributed, with a mean of 22%. To test her hypothesis, the physician measures the fat percentage in a random sample of 12 middle-age men currently employed by the corporation. The fat percentages found were as follows: 24, 40, 29, 32, 33, 25, 15, 22, 18, 25, 16, 27. On the basis of these data, can we conclude that middle-age men employed by the corporation have become fatter? Assume a directional H1 is legitimate and use ?= 0.05 (1 tail) in making your decision.
Following are the data collected. Should the head of the Bureau be concerned about the time taken at lunch by employees? Why?
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportions of children are overweight?
it is known that the number of people who enter a bank during a time interval of t minutes is a poisson random variable
the sampling distribution of the sample mean. use the central limit theorem to find the approximate probability that the mean number of flaws exceeds 1.8 per square yard.
a bag contains 6 green marbles 10 blue marbles and 4 yellow marbles. what is the chance of drawing a green marble? if a
A sample of 60 night shift workers showed that the mean number of units produced was 351. At the .05 significance level, is the number of units produced on the night shift larger?
Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.
A normal distributed population has a mean of 250 pounds and a standard deviation of 10 pounds. Given n = 20, what is the probability that this sample will have a mean value between 245 and 255 pounds?
Implement a representation for rectangles in a plane. (Hint: You may want to make use of exercise 2.2.) In terms of your constructors and selectors, create procedures that compute the perimeter and the area of a given rectangle. Now implement a di..
a population has mean 20. a simple random sample of size 100 is selected from this population. what is the mean of the
in 2010 when she was a high school senior alysha scored 670 on the mathematics part of the sat. the distribution of sat
Each millisecond at a telephone switch, a call independently arrives with probability p. Each call is either a data call(d) with probability q or a voice call (v). Each data call is a fax call with probability r.
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