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Confidence interval for mean.
The mean monthly salary of a random sample of 64 college graduates under the age of 30 was found to be $1325 with a standard deviation of $680. Construct a 99% confidence interval forμ, the population mean of monthly salaries of all college graduates under the age of 30. Interpret your answer in the context of the problem.
If 25 men aged 18-24 are arbitrarily chosen, determine probability that their mean serum cholesterol level is between 165 and 200.
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
What is the OR of getting cancer fora late child birth woman compared to an early first birth woman?
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
Find out the probability that the return for common stocks will be more than 0%.
Suppose the assembly times follow normal distribution. Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
What is the best prediction for the number of products sold based on advertising costs of $7000?
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
What is the probability of the person is 20 to 24 years old.What is the probability of the person is 20 to 34 years old.
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