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The standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.
a sport preference poll yielded the following data for men and women. use a 5 significance level and test to determine
you wish to test the claim that ? gt 33 at a level of significance of ? 0.05 and are given sample statistics n 50 x
A psychiatrist would like to determine whether a new medication has any effect on psychotic symptoms. A sample of patients is assessed and then placed on drug therapy for 2 weeks. The severity of their symptoms is assessed again at the end of the tre..
Medical schools last year intended to specialize in family practice. What is the width of a 90% confidence interval for the proportion that plan to specialize in family practice.
a researcher wishes to estimate with 95 confidence the proportion of adults who have high-speed internet access.
The quality control manager at a light globe factory needs to estimate the mean life of large shipment of energy-saving compact light globes. The historical standard deviation of light globe life is 250 hours. A random sample of 64 light globes..
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable.
question you note that your officer is happy on 60 of your calls so you assign a probability of his being happy on your
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random
Is the number of children that a college student currently has independent of the type of college or university being attended?
a study shows that approximately 15 of all businessmen who wear ties wear them to tight. at a board meeting of 25 all
Prof Hardtack gave three exams last semester in a large lecture class. The standard deviation = 7 was the same on all three exams, and scores were normally distributed.
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