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The president of a company that manufactures central home air conditioning units has told an investigative reporter that at least 85% of its homeowner customers claim to be "completely satisfied" with the overall purchase experience.
If the reporter were to subject the president's statement to statistical scrutiny by questioning a sample of the company's residential customers, would the test be one-tail or two-tail? What would be the appropriate null and alternative hypotheses?
Plot the data on the same line and give your impression regarding any apparent differences between the two companies.
the reading speed of second grade students in large city is approximately normal with a mean on 90 words per minute and
How can you or your department decide whether or not the variation is important? How could using a mean difference test help?
in developing a confidence interval for the population standard deviation ? we make use of the fact that the sampling
question abc airlines operates 50 seat planes between albany and boston. for tomorrows flight it has accepted 62
If the company loses contract A, the probability winning contract B decrease to .2. Find the probability of the following events. Winning both contracts
dizio tv company has recently invested in manufacturing processes to enhance the quality of their products. in testing
suppose random poll of 632 likely voters in alabama found that 373 feel that daylight savings time should be abolished.
lowering the price does not decrease this behavior and we should not decide to lower prices based on this research." Comment on the executive's conclusion. What type of inference is being made? Will the decision not to lower prices be a good one.
a binomial probability experiment is conducted with the given parameters. compute the probability of x successes in the
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
discrimination the u.s. supreme court considered a case involving the exam for firefighter lieutenant in the city of
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