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The Environmental Protection Agency (EPA0 estimated that the 1994 Polaris automobile obtains a mean of 35 miles per gallon (mpg) on the highway. However, the company that manufactures the car claims that the EPA has underestimated the Polaris' mileage. To support its assertion, the company selects 50 1994 Polaris cars and records the mileage obtained for each car over a driving course similar to the one used by the EPA. From the sample, the mean was 38.2 mpg. Assume the population standard deviation is 7.1 mpg.
a. State the correct null and alternative hypotheses that the company wishes to test.
b. Calculate the test statistic that would be used for conducting the desired test.
Solve x^2 = -2 where x is a real number. Simplify your answer as much as possible.
Welcome a woman taking the initiative in asking for a date. What is the probability that seven (7) of the men say NO.
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
Compute the coefficient of determination for bone loss and women's age and describe what this statistic means.
All but one of the following statements contain a blunder. Which one does not contain a blunder
Biologist estimates that 50% of the deer in a region carry a certain type of tick. For a sample of 300 deer selected at random, what is the chance that 155 or fewer deer have this tick?
A normal distribution with a mean of 68 years and a standard deviation of 3.5 years. What proportion of the plan recipients would receive payments beyond age 75?
What is the difference between resampling (bootstrapping) and double sampling in research? Is there any difference or is the same? Please explain your response?
For a population with µ = 62 and Ï? = 12, find the X-value that corresponds to each of the following z-scores.
A trucking firm suspects that the mean lifetime of a certain tire uses is less than 35,000miles. To check the claim the firm randomly selects and tests 54 of these tires and gets a mean life time of 34,570
Find the probability that there are two oral proposals and two written proposals in a particular week. Find the probability that there are exactly two oral proposals and two or fewer written proposals in a particular week.
Let Z be a standard normal random variable. Calculate the following probabilities using the calculator provided. Round your responses to at least three decimal places.
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