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A work-study engineer times a certain operation, and discovers that the average time it takes is 10 minutes, but on 15% of occasions it takes more than 13 minutes. Assuming that times for the operation follow a normal distribution, what is its standard deviation?
Recent actual and forecasted data for product XYZ is given in the following table.
With a confidence of 95%, what is the margin of error for the proportion of all carp that would incorporate the gene into their DNA?
Assuming that these are a random sample of all publicly traded companies, construct a 95 % confidence interval for the overall noncompliance proportion.
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
Classifcation Which of the following are continuous variables and which are discrete?
Make a decision using the Decision Rule approach at given α = 0.05.
Assume that the distribution of heights of adults American normally distributed, with mean 69 inches and standard deviation 2.8 inches.
A small New England college has a total of 400 students.The Math SAT is required for admission, and the mean score of all 400 students is 620. The population standard deviation is found to be 60. The formula for a 95% confidence interval yields th..
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states.
Assume that the number of left-handers is a binomial random variable. (Refer to the formula for mean and standard deviation for binomial prob. Distribution)
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
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