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Noise level tests were done on 50 new light rail vehicles. The results of the test gave a sample mean of 75 decibels and a sample standard deviation of 8 decibels. Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
Using the Binomial Distribution, find the probability that if Air Northeast books 22 people on a flight, not enough seats will be available for all booked passengers.
Find the sample size for the 95% confidence interval used to estimate the population proportion.
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
Are there differences in satisfaction with Intake process of clients who admit with mental health problems, substance abuse problems, or both.
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