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Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys can be completed in a mean time of 15 minutes or less. If a longer mean survey time is necessary, a premium rate is charged. Suppose a sample of 35 surveys shows a sample mean of 17 minutes. Use = 4 minutes. Is the premium rate justified?
a. Formulate the null and alternative hypotheses for this application.H0:Ha:b. Compute the value of the test statistic (to 2 decimals).
c. What is the p-value (to 4 decimals)?
d. Using = .01, is a premium rate justified for this client?
The lives of many people are affected by a fear that prevents them from flying. The Marist Institute for Public Opinion conducted a poll of 1014 adults, 48%of whom were men.
Choose one time-series describing Airlines and make a line chart. Describe the trend (if any) and discuss possible causes. Fit both a linear and an exponential trend to the data.
Consider some decision-making situations in any aspect of Hospital Administration, and describe two or more population variances are important.
What other information would you like to know to answer the question about salary equity between the genders? Why?
Computing probability values using normal distribution - Find the proportion of the observations will fall in the interval from 40 to 60?
Because of a recent incident in which a number of people became ill after eating undercooked hamburger meat, intensive interest has centered around the cooking time for hamburger patties.
Projection are form the U.S. National Center for Education Statistics>. Create a multiple bar graph of data, and then explain any trends.
The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
What are some critical decisions involved in selecting an appropriate measurment scale? How might these decisions influence the research design?
Computing the probability values using normal distribution - Find the probability that a regular rat (without the supplement) would solve the maze with a score less than or equal to X = 24 errors?
The sampling distribution of the average score and Suppose x' is your average pay for the 100 weeks. Then x' has approximately
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
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