Average mileage of the fleet
A certain car model has a mean gas mileage of 29 miles per gallon (mpg) with a standard deviation of 5 mpg. A pizza delivery company buys 38 of these cars. What is the probability that the average mileage of the fleet is greater thatn 27.8 mpg?
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The FDA tests the tobaccos in two different types of cigars for nicotine content (in mg) and obtained following results. Construct the 95% confidence interval for the difference between mean nicotine content. Give an interpretation of the interval
Listed below are systolic blood pressure measurements (in mm Hg) obtained from the same woman. Find the regression equation, letting the right arm blood pressure be the predictor (x) variable. Find the best predicted systolic blood pressure in the
Use a scatterplot and the linear correlation coefficient r to determine whether there is a correlation between the two variables. Use a=0.05.
As reported by a source for statistics, the mean serum high density of females 20-29 years old is 53. If serum cholestrol is distributed normally with a standard deviation of 13.4, answer the following questions.
An accounting firm is auditing the shipping orders for the past year for billing errors. It chooses a random sample of 64 shipping orders. What is the probability that the sample mean weight will be within 2.5 ton of the true population mean of 31
Consider the function given below: f(x) = kx4 0 < x < 2.76 What must be the value k so that f(x) is a valid probability density function? Give your answer to four decimal places.
The third forecasting method used was an exponential smoothing method and the MSE of the data set using this method was found to be 329. When comparing the MSE of each method, which forecasting method is the most accurate of the three?
A random sample of size 36 is selected from a population whose mean is 30 and standard deviation is 6. Calculate the probability that the sample mean will lie within 3 units of the true population mean.
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