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In 2004 the federal Department of Education reported that, nationally, the proportion of college freshmen that returned to the same school for their sophomore year was 0.69. Suppose we select a random sample of 480 freshmen from across the nation.
Question 1. What is the expected value of the sampling distribution model for the proportion of 480 freshmen that will return to the same school for their sophomore year?
Question 2. What is the standard deviation of the sampling distribution model for the proportion of 480 freshmen that will return to the same school for their sophomore year?
Question 3. What is the probability that the proportion of these 480 freshmen that return to the same school for their sophomore year is less than 0.65?
A local bank reports that 80 percent of its customers maintain a checking account, 60 percent have a savings account, and 50 percent have both.
You will be graded on accuracy, completeness (addressing each point above), and effectiveness (utility, ease of reading).
Difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
What are the differences between probability distribution functions and probability density functions? Why do we care?
Produce a printout of the frequency tables, showing the total of both frequencies.
Graph the p.d.f and show that the probability of the part failing in the first 200 weeks is 1/8
The board of directors of Saner Automatic Door Company consists of 12 members, 3 of whom are women.
How could your answer in question (a) change if you knew returns followed a skewed distribution instead of a normal distribution? Explain briefly.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor..
Basic Statistics problem
Primary healthcare workers believe that anaphylactic shock reaction to immunization injections occurs with children in one case in two thousand.
The company sells lawnmowers for $895 each. The variable cost per lawnmower is $520. The company's monthly fixed costs are $84,500.
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