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1. A supermarket manager is examining whether a new plastic bagging configuration in the produce area might make it more efficient for customers who are bagging their own fruits and vegetables. She observes a sample of customers using the new system and a sample of customers using the standard system, and she notes how many seconds it took each of them to unroll and open the plastic bag in preparation for bagging the veg- gies. The data are in file XR11098. Considering these as data from independent samples, use the 0.025 level of significance in examining whether the population mean for the new bagging system might be less than that for the conventional system. Identify and interpret the p-value for the test.
2. A company that makes an athletic shoe designed for basketball has stated in its advertisements that the shoe increases the jumping ability of players who wear it. The general manager of a professional team has conducted a test in which each player's vertical leap is measured with the current shoe versus the new model, with the data as listed in file XR11099. At the 0.05 level of significance, evaluate the claim that has been made by the shoe com- pany. Identify and interpret the p-value for the test.
find an equation of the parabola that has the indicated vertex and whose graph passes through the given point. vertex
Test at the 1% significance level whether currently all adult men spend less than 11 hours per week watching sports on tv. Calculate the p-value for this problem and conduct the test using the p-value method.
Perform all pairwise comparisons among the three programs, using a Tukey adjustment and an overall significance level of 0.05, then interpret all your results.
The inspector samples 12 cases at random, and subsamples 3 cans randomly from each selected case. Estimate the total number of worm fragments, along with a 95% confidence interval.
Calculate the measures of central tendency, dispersion, and skew for your data. Display your descriptive statistical data using graphic and tabular techniques.
Find a 95% confidence interval for the population mean concentration of uric acid in this patients blood. What is the margin of error?
1 a random sample of 60 college graduates results in a mean time to graduate of 4.58 years with a standard deviation of
Find the critical t-value that corresponds to 90% confidence. Assume 90 degrees of freedom.
the mean number of patients admitted per day to the emergency room of a small hospital is 3. if on any given day there
exercise to reduce stress a survey by mens health magazine stated that 14 of men said they used exercise to reduce
in a certain population 1 of the individuals are infected with a certain virus. a test is applied to the whole
The calculated p-value for a hypothesis test is 0.084. What decision about the null hypothesis would occur in the following: The hypotheis test is completed at the 0.05 level of significance.
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