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Grear Tire Company has produced a new tire with an estimated mean lifetime mileage of 37,500 miles. Management also believes that the standard deviation is 6,000 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.
Subject in a study of body mass index (BMI) included a sample of 40 men who claimed to engage in a variety of sports activites (the multisport group). The mean BMI for these men was 22.41 with a standard deviation of 1.27.A second group of 24 male rugby players had a mean BMI of 27.75 with a standard deviation of 2.64. Is there a sufficient evidence for one to conclude that, in general, rugby players have higher BMI than multisport men? use alpha = 0.05 Make sure to write the appropreate null and alternate hypotheses, then test them.
Under the new structure of the sample, how will the answers to a, b, and c change and create a 95-percent confidence interval for the average distance of Brand A
The mean starting salary for college graduates in the spring of 2000 was$31,280. Assume that the distribution of starting salaries follows the normal distribution with a standard deviation of 3,330.
you are an engineer for bulbs lsquor us and youve developed a lightbulb that you claim consumes less than 5 watts per
a river is rising at a rate of 3 inches per hour. if the river rises more than 2 feetit will exeecd flood stage. how
What percentage of the workers is paying between $1800 and $2400 per year toward the family health coverage premium? What is the probability that a worker pays more than $2500 towards the family health coverage premium?
A certain type of tomato seed germinate 90% of the times. if a farmer plants 25 seed, What is the probability that: -exactly 20 germinates more than 19 germinates.
Given below is the rate of return for one year (reported in percent) for the sample of 12 mutual funds. Using .05 significance level is it sensible to conclude that mean rate of return is more than 4.50 percent?
If a simple random sample of 50 players was taken, what is the probability that the sample mean will exceed $210,000?
1. ross whites machine shop uses 2500 brackets during the course of the year and this usage is relatively constant
a directory of personal computer retail outlets in the united states contains 12080 alphabetized entries. explain how
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation for the number of hours of television watched per day is 1.6 and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a..
Solve the following confidence interval and interpret your results. Explain how you arrived at your result. Use Excel to show work if necessary.
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