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1. The activities director of a large university has surveyed a simple random sample of 100 students for the purpose of determining approximately how many students to expect at next month's awards ceremony to be held in the gymnasium. Forty of the students said they plan to attend. What are the upper and lower 95% confidence limits for the number of the univer- sity's 10,000 students who plan to attend the awards ceremony?
2. A research firm has found that 39% of U.S. adults in the over-$75,000 income category work at least 51 hours per week. Assuming this was a simple random sample of 500 adults in this income group, construct and interpret the 95% and 99% confidence intervals for the proportion who work at least 51 hours per week. For each of the confidence intervals, identify and explain the maximum likely error in the study.
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
the local municipality claims that since the percentage of intersections that had an accident last year decreased from
A metropolitan school system consists of two districts- north and south. the north district contains 60% of all students, and the south district contains 40% of all students.
The researcher computes the sum of squares for groups as SSG = 40030 and the sum of squares for error as SSE = 414780. The numerical value of the ANOVA F statistic is
in a shipment of 12 room air conditioners there are 3 with defective thermostats. three air conditioners will be
a professor in the school of business wants to investigate the prices of new textbooks in the campus bookstore and the
The company wants to formulate a linear programming model to determine the number of grams of each ingredient that must go into the drug in order to meet the antibiotic requirements at the minimum cost.
A certain brand of automobile tire has a mean span of 3500 miles and a standard deviation of 2000 miles. (assume the life spans of the tires have a bell-shaped distribution)
If not, what is the relationship between the percentile of the sum and the sum of percentiles? For what per- centiles is the roll-up procedure valid in this case?
according to a survey of 25000 households conducted by nielson company 51 of the people watching the 2010 super bowl
The mean weight of 500 students is 151 lbs and the standard deviation is 15 lbs. Assuming the weights are normally distributed, find out how many students weigh between 120 and 155 lbs.
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