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A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test the weight of the boxes, a few were checked. The mean weight was 20.4 pounds, the standard deviation 0.5 pounds. How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
Some of the factors affect statistical power for a one sample t test. How does statistical power change (increase or decrease) for each of the following changes?
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
How large a sample would be necessary to estimate the population proportion with a margin of error of 0.05 at 95% confidence?
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
She is interested in testing the null hypothesis that the mean SAT score is the same for each type of schooling using the one-way ANOVA. Some summary statistics for the three groups are given below, followed by the one-way ANOVA table.
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
Would you use a one-tailed or two-tailed test? Explain your response.
Fair die is rolled 10 times. Determine the probability that the odd number (1, 3 or 5) will occur less than 4 times?
would this prove that they are exceeding their goal, using α = .025?
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