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The owner of West-End Kwick Fill Gas wants to determine the portion of customers that pay with a credit card. He surveys 100 customers and finds that 50 pay with a credit card. Develop a 95 percent
From the records he selects a random sample of 60 customers and finds the mean number of gallons is 9.60. Develop a 99 percent confidence interval for the population.
How would a researcher know whether linear regression was the appropriate statistical technique to use? What are some of the benefits of fitting the relationship between two variables to an equation
Let X and Y be independent geometric distributions. U = min(X,Y), V = X - Y (a) Show that U and V are independent (b) Find the distribution of Z = X / (X+Y) (c) Find the joint pdf of X and (X +Y)
The computer server through which the e-mails are routed showed that s = 19.4. Has the new policy had any effect? Use a 5% level of significance to test the claim that there has been a change (eithe
A random sample of 360 medical doctors showed that 106 had a solo practice. As a news writer, how would you report the survey results regarding the percentage of medical doctors in solo practice? Wh
Suppose that the average life of a refrigerator before replacement is m = 14 years with a (99.7% of data) range from 8 to 20 years. Let x = age at which a refrigerator is replaced. Assume that x has
Suppose a certain species of fawns between 1 and 5 months old have a body weight that is approximately normally distributed with mean m = 21.1 kilograms and standard deviation s = 3.7 kilograms. Let
Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. Suppose that for healthy females, x has an approximately normal distribution with mean m = 4.7 and standard deviat
Calculate and interpret the Rate Ratio, Etiologic Fraction, and Population Etiologic Fraction.
Obtain the margin of error E, for the confidence interval you found in part (a) Determine the sample size required to have a margin of error of 0.6 cm with a 95% confidence level.
Which of the following is an example of a parametric test?
Indicate whether the data are a time series or a cross section. Number of cars sold in a dealership each day in December.
The quarterly return for a group of 50 mutual funds with mean of 2.8% amd standard deviation of 5.1%--can be modeled by a normal model. Based on the model N (0.028, 0.051). what are the cutoff value
The quarterly returns of a group of 59 mutual fund with the mean of 3.6% and standard deviation of 5.3% can be modeled by a normal model. based on the model N(0.036, 0.053), what are the cutoff valu
Predict the weekly sales of pet food for a store with 8 feet of shelf space situated at the back of the aisle. Construct a 95% confidence interval estimate and a 95% prediction interval. Perform a r
The quarterly returns of a group of 53 mutual fund with the mean of 3.7% and standard deviation of 5.9% can be modeled by a normal model. based on the model N(0.037, 0.059), what are the cutoff valu
35% brown, 20% yellow, 20% orange, 15% green, and 10% tan. Each piece of candy in a random sample of 100 plain M&M's was classified according to color,and the results are listed below.
Based on the equation from # 28, what is the predicted value of y if x = 3? Show all work and justify your answer. Find an equation of the least squares regression line.
Grandma gertrude's chocolates, a family owned business, has an opportunity to supply its product for distribution through a large coffee house. However, the coffee house chain has certian specificat
A sample of 100 customers at the Lighthouse Cafe resulted in the following frequency distribution for a dinner bill.
A human resource manager at a large company wants to estimate the proportion of employees that would be interested in reinbursement for college courses. If she wishes to be 95% confident that her es
A human resource manager at a large company wants to estimate the proportion of employees that would be interested in reinbursement for college courses.
What is the standard deviation of the company's annual expense with the service contract for the computer?