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Companies that sell stock mutual funds charge their investors expense fees to offset the costs of research and administrative activities. In 2006 the average expense fee as expressed as a percentage of total assets invested in the fund was 0.93%. Assume that the distribution of expense fees is distributed as a normal random variable with a mean of 0.93% and a standard deviation of 0.3%. What proportion of stock mutual funds have an expense fee between 0.75% and 1.25%
A certain company relies heavily on phone orders. Suppose past records show that R% of all incoming phone calls to this company are orders from customers.
Does the evidence suggest that postpartum women do not get enough sleep? Use =0.05 level of significance. How is the problem set up using the classical and P-value approach.
Use this information to develop a 95% confidence interval to estimate the production variance for the hourly wages of production workers in U.S. What is the value of upper limit of this confidence interval?
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
Question: If the regression line is drawn as Y = C + 1075x, when X was 2 and y was 239, given that the intercept was 11. Calculate the residual
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. What is the probability that a randomly selected terminal will last more than 5 years?
You are interested in knowing if there is a statistical difference in driving speeds between Day 1 and Day 10. Which statistical test would be appropriate? Why?
The probability of getting a promotion and a raise is 0.25. What is the probability of getting a raise.
assume that any single labrotory test in a 3 test battery obtained from healthy volunteers has a 5 chance of falling
A computer manufacturer offers a help line that purchasers can call for help 24 hours a day, 7 days a week. Clearing these calls for help in a timely fashion is important to the company's image.
Determine the mean and standard deviation of following probability distribution.
Suppose that a random requisition is found to have been incorrectly entered. What is the probability that it was processed by data entry specialist 1? By data entry specialist 2? By data entry specialist 3?
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