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As you answer this question, try to think of where you, or your company, would use confidence intervals. For example, DeVry uses confidence intervals to determine the number of sections of each class to offer.
Suppose that I look at ten sections (350 students) of Keller classes over the past couple of sessions, and determine that, on the average, 15% of the students in those classes wanted to take MATH533 the following session.
Construct a 95?% confidence interval for the true percentage of students who want MATH533 next session.
Bonus question: There are currently 6223 students enrolled in Keller for March 2018. If each MATH533 class has a max enrollment of 40, what is the fewest number (with 95% confidence) of MATH533 sections that we should run in May 2018?
Describe how systematic random sampling could be used to select a random sample of 1,000 customers who have a certificate of deposit at a commercial bank. Assume that the bank has 25,000 customers who own a certificate of deposit. Explain why a ce..
the marketing manager of a large supermarket chain faced the business problem of determining the effect on the sales of
Construct a 95% confidence interval for the population proportion of employers who had a mandatory mail-order program in place or were adopting.
Find the approximate probability that at least 70?% of 100 randomly sampled people taking the bar exam will pass.
Do the independent variables correlate statistically significantly and practically with the dependent variable?
State the null and alternative hypotheses in the given situations by defining the parameters used. Also, state any assumptions that you need to make to conduct the test:
The temperature ? measured in degrees centigrade is related to T by ? = 5/9(T - 32). Describe the probability law of ?.
Personal probability. Personal probabilities are personal, so we expect them to vary from person to person. Choose an event that most students at your school.
using the data below construct a table that combines robbery and assault into one category labeled violent and theft
the rates of on-time flights for commercial jets are continuously tracked by the u.s. department of transportation.
The data can be found in the Excel file named "ProjectData - Post Graduated Survey" in Blackboard. Use this data to answer the following questions:
Labrie Hospital wants to analyze its revenue per patient day. A "patient day" is one patient staying for one day. The following information has been provided to you: Determine the revenue formula using linear regression.
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