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A manufacturer claims that the calling range (in feet) of its BOO-MHZ cordless telephone is greater than that of its leading competitor. A sample of 9 phones from the manufacturer had a mean range of 1350 feet with a standard deviation of 42 feet. A sample of 17 similar phones from its competitor had a mean range of 1280 feet with a standard deviation of 28 feet. Do the results support the manufacturer's claim? Letp1 be the true mean range of the manufacturer's cordless telephone and p2 be the true mean range of the competitor's cordless telephone. Use a signi?cance level of a = 0.1 for the test. Assume that the population variances are equal and that the two populations are normally distributed.
A couple has agreed to attend a "Casino Night" as part of a fundraiser for the local hospital. They do not like to gamble because they believe that gambling is generally a losing proposition. However, for the sake of the charity, they have decided..
comparison of paired and unpaired samples test.in january 08 fifty clients of a county mental health mental retardation
Back at work as a clown, you are pumping gas into a spherical balloon so that its volume increases at a rate of 2 in3/s. What is the rate of change of its radius when it is 6 inches?
Find data set that maximizes the value of the mean.- Find a data set that minimizes the value of the mean.- Find two different data sets that have a mean equal to 3 but different standard deviations.
question 1 the mean starting salary for college stats major graduates in spring of 2011 was 65000. assuming a normal
statistics softwarea statistics professor has observed that for several years about 13 of the students who initially
as we have noted in previous chapters even a very small effect can be significant if the if the sample is large enough.
Should Mark use the study? Why? What is the maximum amount Mark should be willing to pay for this study? What is the maximum amount he should pay for any study?
The specification limits are set between 15.8 and 16.2 ounces.
At a probability of type 1 error of 0.05, test the claim that the assistant professors earn more than $42000 per year. the standard deviation of the population is $5230.
Consider the following estimated regression equation, based on 10 observations.
a sample of 250 observations is selected from a normal population for which the population standard deviation is known
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