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The motors sell for $100 each, but a double-your-money-back guarantee is in effect for any defectives the purchaser may receive. Find the expected net gain for the seller if the probability of an
Determine a typical seasonal index for each of the four quarters.
A consulting engineer receives, on average, 0.7 requests per week. If the number of requests follows a Poisson process, find the probability that in a given week, there will be at least 1 request.
Determine the least squares equation. According to this information, what are the estimated sales for 2008 and 2009?
In a recent study 90 percent of the homes in the United States were found to have TVs. In a sample of nine homes, what is the probability that All nine have TVs?
75% of the trucks had 16 wheels. What is the expected value for the number of wheels on a truck manufactured by Acme Truck in 2010?
Is ownership of an American Express card a categorical or quantitative variable?
A new claim comes in at $2250. The claimant is told by the insurance company that he belongs to a high risk group. Calculate the proportion of claims that exceed $2250.
The manufacturer wants to set the warranty such that only 5 percent of the vacuums are returned for warranty work. Determine the length of the warranty.
A die has half of the faces red and the other half black. The die is rolled 3 times. Let the random variable X represent the number of black outcomes out of three rolls. What is P(1) that is the pro
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.
Within what range would approximately 95% of the waiting times lie if we were sampling a normal distribution? Do you think the distribution is likely to be normal? Explain.
A psychologist, Dr. Bill Mikalek, administered a test of manual dexterity to 30 third-graders. The times, in minutes, required to complete the test are given below. Construct a frequency distributio
If the diameters are distributed normally with mean μ=0.251 and standard deviation σ=0.001, what percentage of them are within specifications?
The probability that an individual has 20-20 vision is 0.15. in a class of 50 students, what is the mean and standard deviation of the number with 20-20 vision in the class?
Scores on a standard test are normally, distributed with a mean of 104 and a standard deviation of 15. An individual's test score is found to be 112. Find the z-score corresponding to this value.
From 8 names on a ballot, a committee of will be elected to attend a political national convention. how many different committees are possible?
Suppose a sample of 40 major league platers was taken. find the approximate probability that the average salary of the 400 players exceeded $1.1 million.
Explain whether you would retain or reject the Null Hypothesis that your sample comes from a population whose mean is 100. Use the alpha = .05 criterion.
With any statistical model, we assess the fit. Does the model accurately depict the truth? Explain how standard deviation helps to assess the "Fitness" of the mean.
Eleven chairs are numbered 1 through 11. Four girls and seven boys sit on these chairs at random. What is the probability that chair 5 is occupied by a boy?
A random sample of size 100 is taken from an infinite population having the mean μ=76 and the standard deviation σ=16. What is the probability of getting an x bar between 75 and 78?
What is the probability that exactly two customers arrive in the two hour period of time between 2:00pm and 4:00 pm (one continuous two hour period)?
The number of cracks in a section of interstate highway that are significant enough to require repair. What is the probability that at least one crack requires repair in 1/2 mile of high.