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The life of a calculator has a normal distribution with a mean of 54 months and a standard deviation of 8 months. What should the warranty period be to replace a malfunctioning calculator if the company does not want to replace more than 1% of all the calculators sold.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the decision rule.
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
Make your calculation supposing a two-sided two-sample t-test with a type I error (alpha) of 0.056
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 22 eggs per month with a standard deviation of 2.03 eggs per month.
Quality Progress, February 2005, reports on improvements in customer satisfaction and loyalty made by Bank of America. A key measure of customer satisfaction is the response (on a scale from 1 to 10) to the question
Construct a 99 percent confidence interval for the mean commission earned by local Tupperware dealers. You may assume the commissions are normally distributed.
A and B are two intersecting sets, and a, b, ab, and x represent the usual symbols for the number of elements contained in the four defined areas of the associated Venn Diagram. Find the values of ab and a if:
What can you conclude from Chebyshev's theorem about the percentage of adults in the town whose heights are between 57.3 and 77.7 inches? Please show work.
Explain the double-negative logic of hypothesis testing (eg: a scientist fails to reject the null hypothesis). What is the five-step process for hypothesis testing? Is the order important? Why or why not?
If we believe the manufacturer's assertion, what is the probability that at most 3 of the 6 seeds that were planted will germinate?
What is the probability that a randomly selected adult regularly consumes both coffee and soda? What is the probability that a randomly selected adult doesn't regularly consume at least one of these two products?
The company believes that it averages about the same weight per bag in each of two production lines. To test this idea, they will perform a hypothesis test to compare the two lines at the alpha level of 0.05. State the null and alternative hypothe..
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