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The average gas mileage of a certain model car is 29.0 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 0.6 miles per gallon, find the probability that a car has a gas mileage of between 28.8 and 29.2 miles per gallon.
The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.
In a class roster of 18 students, what are the chances that there are at least 2 people with the same birthday (same day, not same year)?
The manager of a paint supply store wants to determine whether the mean amount of paint conatined in 1- gallon cans purchased from a nationally known manufacturer is actually 1 gallon.
Run a multiple regression and interpret all the findings, R 2 , F, IV coefficients, and the intercept. Then in paragraph format, identify and report the following:
A researcher used stepwise regression to create regression models to predict Birth Rate (births per 1,000) using five predictors: Life Exp (life expectancy in years).
Use the method of least squares to model the relationship between x and y.
Test out an suitable hypothesis also state your conclusion. Make sure the suitable assumption as well as conditions are satisfied before you proceed.
What is the value of the population mean? What is the best estimate of this value?
In the Distance problems, the kids are given a Rate (speed) that a vehicle is going, as well as a Time that the vehicle travels, and asked to calculate the Distance travelled. In the Rate problems they are asked to compute Rate from the other two ..
People with type O-negative blood are universal donors. That is, any patient can receive a transfusion of O-negative blood. Only 7% of the American population have O-negative blood.
A teacher figure that final grades in the statistics department are distributed as A,25%, B, 25%, C, 40%, D, 5%, F, 5%. At the end of the randomly selected semester, the following number grades were recorded.
Calculate the coefficient of determination, given that the linear correlation coefficient, r, is -0.625. What does this tell you about the explained variation and the unexplained variation of the data about the regression line?
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