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The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50. (This indicates that the stock of asprin turns over on the pharmacy shelves an average of 6 times per year.) It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
A random sample of 64 bottles of the 200-count size asprin showed a mean turnover rate of 5.84. Shall we reject the hypothesis that the population mean is 6.0? Interpret the result.
We want to test the hypothesis that the population variances are equal.
Give an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
Health and Nutrition Examination Survey, suppose that weights of men now are normally distributed with mean of m =172 pounds and standard deviation of s = 29 pounds.
Answer the following three questions based on what you know about statistics now.
A school administrator randomly selects 12 classes from your school and then selects all of the students of those classes to study a school library issue. Which type of sampling design is being used.
If you draw one ball from the urn what is the probability that it is blue or white?
Draw suitable distribution curve indicating position of the TS and CV.
The analysis of covariance (ANCOVA) is generally useful for _______________
What is the probability that a U.S. user who downloads music, selected at random, obtained it from either the United States or Canada.
An experiment was conducted to determine the effects of three different pesticides (P1,P2,P3) on the yield of three different varieties of citrus tree (V1,V2,V3).
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
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