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Twenty subscribers were surveyed, it found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979.00. The standard deviation of the sample was $1000.00.
a. based on this sample information, develop a 90% confidence interval for the population mean yearly premium.
b. How large a sample is needed to find the population mean within $250 at 99% confidence?
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes.
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
A market analyst for the Weber Refrigerator Company has visited various appliance stores in a city to get data on the selling price of different brands of refrigerators. Estimate the population regression equation and interpret the result
If we are dealing with non-normal data we use Chebychev's Theorem. While not as precise, it does provide some level of utility. If we use Chebychev
One of the major measures of the quality of service provided by any organization is the speed with which responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a major ..
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
A random sample of 346 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contingency table below.
Suppose that 46 percent of families living in a certain country own a car and 18 percent own an SUV. The Addition Rule might suggest, then, that 64 percent of families own either a car or an SUV. What's wrong with that reasoning.
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
The manufacturer would like to establish Inventory levels such that there is only a 5% chance of running out of stock. Where the Manufacturer should set the inventory levels?
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
The regression equation is Y = 29.29 - 0.96X, the sample size is 8, and the standard error of the slope is 0.22. What is the critical value to test the significance of the slope at the 0.01 significance level?
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