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The Quick Change Oil Company has a number of outlets. The numbers of oil changes at the Oak Street outlet in the past 20 days are:
65 98 55 62 7959 51 90 72 5670 62 66 80 9479 63 73 71 85
Organize the data into a frequency distribution and include the relative frequency distribution.
Averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
Suppose we select a sample of 16 cuts from various CDs sold by CRA CDs, Inc. What can we say about the shape of the distribution of the sample mean?
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? (That is, does the average cycle length under these conditions differ significantly from 24 hours?)
Show the complete ANOVA table for this test including the test statistic. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude?
If the company does not want to replace more than 5% of the televisions?
The national median sales price for new single-family homes is $230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes in Houston and Boston.
Dertermine the probability that a male is a Major or a Colonel?
What is the importance of the null hypothesis? Why has it been the backbone of mainstream hypothesis testing for decades? What are its limitations?
How many of the installations at the Maumee branch would you expect to take more than 30 minutes? What is the likelihood that fewer than eight installations took more than minutes?
Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
The researcher then records the level of activity for each child during a 30 minute session on the playground. Is this an experimental or a correlation study? Explain your answer.
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
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