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According to a survey 73 % of major US companies electronically monitor their employees. Suppose that 255 such companies are selected independently and at random. (a) What is the probability that 186 companies in the sample electronically monitor their employees?
For a given confidence interval, what is the interpretation of a 96% confidence level?
You only worry if there is at least a 50 or more percent chance that you have the disease. Suppose that test has same specificity = p For what value of p will you start to worry?
A survey on the drinking habits of Americans estimated the percentage of adults across the country who drink beer, wine, or hard liquor at least occasionally. Of the 1516 adults interviewed, 985 said that they drank.
Briefly state the evaluation criteria for using a computed regression equation; specifically, comment on the coefficient of determination, correlation coefficient, and standard error of the estimate.
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
The hypothesis is that the average number of customers served per hour is 24 or less against the alternative hypothesis that the mean number of customers waiting is greater than 24.
A recent report from the American Medical Association claims that for the first time in ten years, the average salary of psychiatrists was greater than $190,000 with a standard deviation of $27,000. What is the null hypothesis for his claim?
If you were told that on a particular day it was raining in Vancouver, what would be the probability that this day would be a winter day?
Furthermore, you could also perform a regression on the data so you have a model with which you can predict other people's IQs based on their mother's IQ.
A survey on household income in Northeast NJ area gave the following numbers in thousands of dollars:
Using z-scores, a population with mean = 37 and standard deviation = 8 is standardized so that the new mean is mean = 50 and standard deviation = 10. How does an individual's z-score in the new distribution compare with his/her z-score in the orig..
From historical data, Harry's Car Wash estimates that dirty cars arrive at the rate of 10 per hour all day Saturday. With a crew working the wash line, Harry figures that cars can be cleaned at the rate of one every 5 minutes.
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