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Do students at various colleges differ in how sociable they are? Twenty-five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of time they spent socializing each day with other students. The results for College X was a mean of 5 hours and an estimated population variance of 2 hours; for College Y, M = 4, S2 = 1.5; and for College Z, M = 6, S2 = 2.5. What should you conclude? Use the .05 level. (a) Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to (a) and (b) to someone who has never had a course in statistics.
How much time should the employer allow employees to finish the job? (Round up to the nearest minute).
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
The remaining 5 were not given the overview. Here are the scores for students in each group:
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and bro..
Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The interquartile range of the salaries will
How large should n be so that the standard deviation of is no more than 0.01 and sampling distribution
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
The price of XYZ Corporation stock is normally distributed all through the year with mean of $42.00 per share and a standard deviation of $2.25 per share. Suppose that the stock is traded 240 days out of the year.
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
What is the 95% confidence interval for the difference between the mean prices of the two models?
Graph the distribution using a histogram. Calculate the mean and standard deviation.
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