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A professional employee in a large corporation receives an average of μ = 38.3 e-mails per day. Most of these e-mails are from other employees in the company. Because of the large number of e-mails, employees find themselves distracted and are unable to concentrate when they return to their tasks. In an effort to reduce distraction caused by such interruptions, one company established a priority list that all employees were to use before sending an e-mail. One month after the new priority list was put into place, a random sample of 33 employees showed that they were receiving an average of x = 28.7 e-mails per day. The computer server through which the e-mails are routed showed that σ = 17.7 Has the new policy had any effect? Use a 10% level of significance to test the claim that there has been a change (either way) in the average number of e-mails received per day per employee. What is the level of significance?
Give a 95% confidence interval for the average caloric content of a 3-ounce cut of top loin steak. Also give a 98% confidence interval for the average caloric content of a cut.
what are the steps in the construction
Conditions Explain why it is not safe to use the methods of this chapter to perform inference in each of the following settings.
Formulate a hypothesis statement for the following claim: "The average delivery time is less than 30 minutes." A sample of 42 deliveries had an average time of 26.9 minutes. Assume the population standard deviation is 8 minutes. Using α = 0.01, te..
The table shows the results of a survey im which 180 family were asked if they own a home and if they will be purchasing a new vehicle this year.
House prices The mean and median selling prices of existing single-family homes sold in July 2012 were $263,200 and $224,200.
An accident insurance company finds that 0.001 of the population incurs a certain kind of accident each year. Assuming that the company has insured 10,000
The probability of being in a car accident when driving more than 10 miles over the speed limit in a residential neighborhood is 0.04.
the study obtained a measure to determine how comfortable the shopper was in a store. Higher scores indicated greater comfort. Suppose the following data were collected. Use a = .05 to test for differences among comfort levels for three types of b..
It costs a company $35,000 to produce 700 graphing calculators. The company's cost will be $35,070 if it produces an additional graphing calculator.
Evaluate these probabilities under the assumption that 960 = 0.025 and q65 = 0.040.
Identify the Factor in this data set. How many levels of the factor are there? What are the levels (name them) Enter this data carefully into SPSS in the correct format for the chosen test from question 1.
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