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A study found that women of normal weight missed an average of 3.4 days of work due to illness during the preceding year, compared to an average of 5.2 days for women who were considered overweight.
Assuming (1) a sample size of 30 for each group and (2) sample standard deviations of 2.5 and 3.6 days, respectively, use a z-test and the 0.05 level of significance in examining whether the mean number of absence days for the overweight group could have been this much higher simply by chance.
Determine and interpret the p-value for the test.
21 percent of the employees in a company have managerial positions, and 31 percent of the employees in the company have MBA degrees. Also, 66 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employee..
Let X be a continuous random variable with probability density function
10 cartons are taken at random from an automatic filling machine.The mean net weight of the carton is11.8 kg and standard deviation of 0.15kg. Does the sample mean differ significantly from the intended weight of 12kgs?
What is the probability the average of the sample is more than $38000 and What is the standard deviation of the sample mean
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100k 200k 300k 400k and
In a survey of 750 senior business executives by Business Week magazine, 56% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than people without the degree. Prepare a 92% confiden..
Mice populations rise and fall with the abundance of acorns, their favored food. Experimenters studied two similar forest areas in a year when the acorn crop failed.
"The probability is 0.99 that a 99% confidence interval contains the true value of the relevant population parameter."- Is this statement true or false?
If we assume that the monthly rents for apartments on the east side are normally distributed, is there enough evidence to conclude, at the .05 level of significance, that is less than $675?
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
The means of two normally distributed populations, where the unknown population variances are assumed to not be equal. What is the upper confidence limit is?
The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with a population mean of 320 and a population standard deviation of 20 inches.
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