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William used a sample of 68 U.S. cities to estimate the relationship between Crime (annual property crimes per 100,000 persons) and Income (median income per capita). His estimated regression equation was Crime = 428 + .050 Income.
Which outcomes would be likely in a bivariate regression on 45 randomly chosen U.S. cities in 2005 with
Y = number of robberies in each city (thousands of robberies) andX = size of police force in each city (thousands of police)?
Assume that female students' heights are normally distributed with a mean given by µ = 64.2 in. and a standard deviation given by σ = 2.6 in.
Draw a box-and-whisker plot for the data set. Find the variance and the standard deviation. please help me as soon as possible please!!! thank you
A medical supplies company buys its supplies in bulk and redistributes them to doctor's offices and clinics. The receive thermometers in lots of 500 from the vendor. They are considering a sampling plan of n=50 and c=1.
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
Satisfies each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to the question.
Assume that the heights of adult white men have a mean of 67.9 inches and a standard deviation of 2.8 inches. If 64 men are randomly selected, find the probability that they have a mean height greater than 68.9 inches.
Can you think of an example where regression analysis can be used? How is regression analysis being used in a retail environment, or how should it be used?
A survey of 120 high school students shows that 39 of them work over 20 hours per week during the school year. Does it demonstrate the conjecture that more than 25% of the high school students work over 20 hours per week during the school year?
Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 secon..
A final exam in Math 157 is normally distributed and has a mean of 75 with a standard deviation of 12. If 36 students are randomly selected, find the probability that the mean of their test scores is greater than 70.
Pizza House offers 4 different salads, 5 different kinds of pizza, and 4 different desserts. How many different three course meals can be ordered?
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
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