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A Tire company has developed a new type of tire. Extensive testing shows that the number of miles the new tire will run before wearing out is normally distrubuted with a mean of 40,000 miles and a standard deviation of 4,000 miles (Hint: Sketch bell shaped curves for the three questions below.
a) What is the probability that the number of miles the new tire will run before wearing out is LESS than 33,000 miles?
b) What is the probability that the number of miles the tire will run before wearing out is between 42,500 and 44,500 miles?
c) The company wants to promote increased sales by offering a 10% discount on a new set of tires if the purchased set lasts longer than a specified number of miles. What mileage should the company set, if they want only 2% of the tires to exceed the specified mileage (i.e, 98% of the tires fail to exceed the specified mileage, with 2% in the right tail)?
Calculate η 2 , the percentage of variance accounted for by treatment.
From past experience, an automobile insurance company knows that a given automobile will suffer a total loss with probability .02, a 50% loss with probability .08, or a 25% loss with probability .15 during a year.
Consider binomial distribution with 14 identical trials, and probability of success of 0.4.
How large sample should be selected in order to obtain p estimate with a bound of 0.08 on the error of estimation.
You have been asked to study the effects of an employee-wide training program, in a company of 500 employees, designed to reduce the amount of customer complaints.
Compare population means or proportions to determine the relationship between variables.
A commuter travels many miles to work each morning. She has timed this trip 5 times throughout the last month. The time (in minutes) required to make this trip was 44, 39, 41, 35, and 41.
A process follows the binomial distribution with n = 8 and p = .3. Find
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
A university club consists of 4 men and 6 women. Two members are chosen at random without replacement. Let X = 0 if first person chosen is male, 1 if first person chosen is female. Y = 0 if second person chosen is male, 1 if second person chosen i..
Find out the following: Mean swipe rate, Standard deviation of the swipe rate.
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