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The structure of a two-factor study can be presented as a matrix with levels of one factor determining the rows and the levels of the second factor determining the columns. With this structure in mind
In studying satisfaction patients have with an operation I have 2 random groups each given a different questionaire. I want to compare the responses of each group and see if the differen
Recall that adding a constant causes the mean to change but has no influence on the variability of the sample. In the resulting data the mean differences are much smaller than those in problem 7.
The following data represent the results from an independent-measures study comparing three treatments.
To interpret, there were 50 days on which no credit applications were received, 77 days on which only one application was received, and so on. Would it be reasonable to conclude that the population di
Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region. On the basis of regional sales, the total sales for the c
Does the breakfast revenue seem to increase as the number of occupied rooms increases? Draw a scatter diagram to support your conclusion.
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types
Discuss how a t Test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students.
You need to estimate the mean Christmas sales across a large chain of jewelry stores. You want to estimate this mean value to within $100 with 99% confidence
Suppose we wish to conduct a survey of adult US voters about whether or not they intend to vote for an incumbent in congress in the next election. Suppose that we survey 1000 people and 230 say they w
A curious parent observes a cereal commercial that states their product has an average of 50 pieces of real fruit per box with a standard deviation of 6 pieces per box. She decides to check the accura
There are two ways to run the experiment. The first is to obtain a random sample of 12 drivers, divide them into two groups at random and assign one group to the standard light and the second group to
Clothing for Runners: Your company sells exercise clothing and equipment on the internet. To design the clothing, you collect a data on the physical characteristics of you different types of customers
A meteorologist wishes to estimate the mean amount of snowfall per year in Spokane, Washington. A random sample of the recorded snowfalls for 20 years from a 140 year period produces a sample mean equ
In this case, we are going to study some data collected from Kelly Blue Book for several hundred 2005 used General Motors (GM) cars. This data allows one to develop regression models to determine car
Random samples of five were selected from each of three populations. The sum of squares total was 100. The sum of squares due to the treatments was 40.
At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
There are four entrances to the Government Center Building in downtown Philadelphia.The building maintenance supervisor would like to know if the entrances are equally utilized.
Complete the table and answer the following questions. Use the .05 significance level.
A real estate agent in the coastal area of Georgia wants to compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean.
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families,some with only a single insur
Grand Strand Family Medical Center is specifically set up to treat minor medical emergencies for visitors to the Myrtle Beach area. There are two facilities, one in the Little River Area and the other
A recent article in The Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30-year rates (in pe