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Given the sample size of 36 bolts with a mean of 3 inches and a standard diviation of .3. What is the 99% confidence interval for the true mean length of the bolt. A researcher developed a question that asked, "Do you believe that drug addicts should be treated more severely?" What are the problems with this question?
Assume a normal distribution applies and alpha = 0.05 (Use Z table), find the Critical value for the alternative hypothesis:
An engine system consists of three main components in a series, all having the same reliability.
Suppose that 1 out of 500 infant's are born with Down's Syndrome.
Researcher is interested in testing whether there are differences in mean between population one and population two.
You calculate the difference in income as (after incentive plan - before incentive plan). You want to test whether income after the incentive plan is different from income before the incentive plan. What are the hypotheses for this test?
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
Say, for example, the correlation is 0.75 between Height (measured in inches) and Weight (measured in pounds). If Height were changed to being measured in centimeters (where 1 inch = 2.54 centimeters) what effect would this have on the correlation..
Powers Tire Company (Which specializes in tires for vehicles ca. 1965) needs your expertise to help them schedule over the next three months. They can make tires using regular labor, or subcontracting.
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population.
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
What is the difference between the probability value and the significance level? Please, also provide examples.
In a sample of 1,000 representing a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City.
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