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Gear tire Company has produced a new tire with an estimated mean lifetime mileage of 36,500 miles. Management also believes that the standard deviation is 5000 miles and that tire mileage is normally distributed. Use a worksheet to simulate the miles obtained for a sample of 500 tires.
A. Use the Excel COUNTIF function to determine the number of tires that last longer than 40,000 miles. What is your estimate of the percentage of tires that will exceed 40,000 miles?
B. Use COUNTIF to find the number of tires that obtain mileage less than 32,000 miles. Then find the number with less than 30,000 miles and the number with less than 28,000 miles.
C. If management would like to advertise a tire mileage guarantee such that approximately no more than 10% of the tires would obtain mileage low enough to qualify for the guarantee, what tire mileage considered in part (b) would you recommend for the guarantee?
the over $50,000 income range did not own a dishwasher. If one household is randomly selected from each income group. Determine the probability that neither household will own a dishwasher.
Which option produces the smallest risk of a Type I error?
Determine the probability distribution associated with these data.
Describe a real-life situation where Pascal's Triangle can be used to calculate probability. Is this the best method for solving your calculation?
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
Estimate the standard deviation of the x distribution. (Hint: Review the empirical rule and SD approximations). What is the probability that a healthy 10-week-old kitten will weigh less than 14 oz?
Draw a tree diagram to show all possible outcomes of the experiment. Label the probability associated with each stage of the experiment on the appropriate branch.
Standard deviation of 12 what proportion of people have diastolic blood pressure less than 90. B. What proportion have diastolic pressure between 80 and 90.
Average length of trout caught in Swanson lake is u=19.For a random sample of 51 fish caught the mean length was xbar=18.5 inches with estimated standard deviation s=3.2 inches.
What role of operations that applies when you are solving an equation does not apply when you are solving an inequality? What is the inherent meaning and justification of cross-multiplication as it applies to solving an inequality?
A four-year financial project is forecast to have net cash inflows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project
She then selects a sample of 102 football players and finds that their average math SAT is 460. Use alpha =.01 to perform the appropriate hypothesis test.
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