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A real estate company wants to study the relationship between house sales prices and some important predictors of sales prices. Based on data from recently sold homes in the area, the variables
y = sales price (in thousands of dollars)x1 = total floor area (in square feet)x2 = number of bedroomsx3 = distance to nearest high school (in miles)
are used in a multiple regression model. The estimated model is: y = 102 + .079x1 + 23x2 - 7x3
Holding the other variables fixed, what is the average change in sales price for each 100 square foot increase in floor space? In Dollars $
Is this change an increase or a decrease?
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
If you select a random sample of 100 sessions, what is the probability that the sample mean is between 7.8 and 8.2 minutes?
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
Let x = number of the ball obtained on any selection. Then the probability distribution for x is given by:
What variables will be included, and collection methods used to obtain data. What is the population, sampling method used and why it is the best. Plan for data: describe what you will do with data once you have it, include types of graphs used and..
Compute the value of the proportion of the population.
In summer 2000, a growing number of warranty claims on Firestone tires sold on Ford SUVs prompted Firestone and Ford to issue a major recall. An analysis of warranty-claims data helped identify which models to recall.
Determine the probability that their SAT scores will differ by more than 50 points?
Calculate a value of lambda using the data from last week concerning the news networks and the reporting practices. Compare your resulting lambda to the resulting chi-square from last week.
A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know.
State the null and the alternative hypotheses. Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
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