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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.
In other words, both variables have the same mean but different standard deviations. Draw rough sketches of the two normal curves on the same graph.
Use the Kolmogorov-Smirnov test to discover whether the distribution of location of accidents is uniformly distributed for the month of September
members of the senate took a battery of tests to assess their abilities. in the talking as if you are saying something
All the pupils took the same achievement test, and the means for groups receiving different methods were compared. What was the dependent variable?
in a report on high school graduation it was stated that 85 of high school students graduate. suppose 3 high school
fifty people in the civilian labor force are randomly selected and the sample average age is computed to be 36.4.a find
The equation for the line of best fit is given as Y = 1.8x + 28.7, and the Pearson correlation coefficient was 0.61. Was the correlation coefficient significantly different from zero? Use α = 0.05.
You will create this Word document by cutting and pasting SPSS output into Word.
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if you want to be 95 confident of estimating the population proportion to within a sampling error of plus or minus 0.05
A population with u=73 and o=9 is transformed into a new population with u=10 and o=2. What is the new value for each of the following scores in the population?
How many participants need to be enrolled in each group to achieve 80% power using a two-sided test with significance level =.05
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