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In order to estimate the average electric usage per month, a sample of 196 houses was selected, and the electric usage determined.
a. Assume a population standard deviation of 350 kilowatt hours. Determine the standard error of the mean.b. With a 0.95 probability, determine the margin of error or standard error.c. If the sample mean is 2,000 KWH, what is the 95% confidence interval estimate of the population mean?
Arbitarily sampling one man and one woman from this population, determine probability neither is a Tay-Sachs carrier? Compute the probability both are carriers?
Calculate the test statistic for the claim in, using the following information. Sample information: A random sample of 40 repairs has a sample mean price of $132.09 and a sample standard deviation of $13.58.
Data follow. Use Excel to create the 90% confidence interval estimate of mean age of all of this magazine's subscribers.
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
If the probability of making a two point shot is greater than the probability of making a three point shot, why do coaches allow some players to shoot the three point shot if they have the opportunity? Use expected value to explain your answer.
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot." What is the standard deviation for the sample proportion?
When using dummy variables in a regression equation to model a qualitative or categorical variable, the number of dummy variables should equal to
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Simulate the arrival of cars at the service station for 20 arrivals and compute the average time between stations and Simulate the arrival of the cars at the service station for 1 hour
Calculate s(k) for each natural number k from 1 through 15. Are the numbers SQRT(5), PI, and -6 in the domain of the function s? What is the domain of the function s?
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
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