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Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the night shift than on the days
A consumer products testing group is evaluating two competing brands of tires, Brand 1 and Brand 2.
Why is statistical significance not necessarily of practical important difference to a business decision? Give an example and explain.
A physician claims that joggers' maximal volume oxygen uptake is greater than the average of all adults. A sample of 15 joggers has a mean of 43.6 milliliters
Estimate the variance of the percent change in airline stock
The mean life of a computer disk drive is 2,000 hours. The standard deviation is 140 hours. Assuming the life-time of the drives to be normally distributed
The accompanying table shows the grades for three randomly selected samples of students in economics, statistics, and accounting classes
Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building
What is an independent sample? What is a related sample? When should researchers use different hypothesis tests for independent and related samples
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead
College Athletics: Graduation Rate. Women Athletes at the University of Colorado Boulder have a long term graduation rate of 67%.
It is asserted that a greater proportion of males (= x 1 ) contribute to charity than females (= x 2 ).
You are curious about whether the professors and students at your school are of different political persuasions, so you take a sample of 20 professors
What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. What is the value of the sample test statistics?
For the hypothesis test, , with n1 = 10 and n2 = 10, the F-test statistic is 2.56. At the 0.01 level of significance, we would reject the null hypothesis.
A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief
Past records suggest that the mean annual income,of teachers in state of Texas is greater than or equal to the mean annual income,of teachers in Virginia.
Finance: P/E of Stocks. The price to earnings ratio(P/E) is an important tool in financial work. A random sample of 14 large U.S. banks gave the following P/E
Is the water on your airline flight safe to drink? It is not feasible to analyze the water on every flight, so sampling is necessary
Suppose that we observe a random sample size n from a normally distributed population. If we are able to reject H0:µ = µ in favor of a two-tailed alternative
A sample of 50 provided a sample mean of 19.4. The population standard deviation is 2.
Supposed we wish to test H0: µ = 10 vs. H1: µ > 10 at the a = 0.05 significant level. Furthermore, supposed that we observe values of the sample mean
A cereal manufacturer wants to determine if the filling machine is operating to specifications. The machine is specified to fill to a 12oz level.
Under what circumstances should a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests
What is meant by the "normal distribution? What is its relevance in statistics?