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The following data show the time series of the most recent quarterly capital expenditures (in billions of dollars) for the 1000 largest manufacturing firms: 24, 25, 23, 24, 22, 26, 28, 31, 29, 32, 37, and 42.
a. Develop a linear trend equation for the time series.
b. Graph the time series and the linear trend equation.
c. What appears to be happening to capital expenditures? What is the forecast one year, or four quarters, into the future?
Office Visits what is the age distribution of patients who make office visits to a doctor or nurse?
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
A university has found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students have registered for the course this semester.
Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days.
A random sample of 200 people was taken. Sixty percent of the people favor President Obama. The 95% confidence interval for the true population of people who favor Obama is?
Estimating confidence interval for mean value of y and find a 95% confidence interval for the expected average total sleep time for a child of age 12
Create a 90% confidence interval for mean score on this placement exam for all students.
Develop a 99% confidence interval for the population proportion.
There is concern about the percent of on-time flights. A recent survey of two major airlines yielded the following results. At α = 0.05 test the claim that there is a difference in proportions of on-time flights.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the null hypothesis and the alternate hypothesis.
Provide a description of one method for estimating the reliability and one method for substantiating the validity of a test.
The house of representatives has a very controversial bill that will be going to vote. To help formulate his strategy on how to get the bill passed, the chairman of the committee that has been studying the bill wishes to know if there is a divisio..
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