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You wish to estimate, with 95% confidence, the proportion of the computers that need repairs or have problems by the time the product is five years old. Your estimate must be accurate within 3% of t
When the correlation coefficient r is not significantly different from 0, which of the following statements is NOT true?
What proportion of the samples will have more than 95% of the deliveries arriving before 10:30 the following morning? or less than 90% of the deliveries arriving before 10:30 the following morning?
Let X denote the lifetime of a radio, in years, manufactured by a certain company. Assume that X is exponentially distributed, with a mean of 5 years.
The driving distance for the top 100 golfers on the PGA tour is between 284.7 and 310.6 yards (Golfweek, March 29, 2003). Assume that the driving distance for these golfers is uniformly distributed
What is the ratio of total units wasted to total units infused?
An environmental scientist says that PCB concentration is between 1.65 and 1.73 ppb. With what level of confidence can that statement be made?
In a city of 120,000 people there are 20,000 norwegians. What is the probability that a randomly selected person will be norwegian?
A roller coaster has 3 seats in each of 12 rows. Riders are assigned to seats in the order that they arrive. If you ride this roller coaster once, what is the probability of getting the coveted firs
Let X be N (μ=25,σ^2=16). Determine the folloing probabilities:
Three balls are divided between two containers. During each period a ball is randomly chosen and switched to the other container. If container 1 contains one ball, What is the probability that it ta
A researcher claims that the average age of people who buy theatre tickets is 43. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 6. At a = 0.01 is t
A false positive rate of 5% is considered to be a conservative estimate. Suppose that there are 20 employees in your company, which tests its workers weekly. What is the likelihood that the test will
The mean delivery time for company ranges from 15 to 75 minutes. How many delivery times must be sampled fro the company to estimate their mean delivery time to within 5 minutes with 98% confidence
There are 37 members on the board of directors for a certain non-profit institution.
Winning the jackpot in a particular lottery requires that you select the correct four numbers between 1 and 33 and in a separate drawing you must select the correct single number between 1 and 15. F
A chemical engineer is studying the output from a pilot plant for a new chemical process. She would like to model the difference, D, between the output from pilot plant and the current process as a
Let the random variable U=.32 be a realization of a Uniform on (0,1) distribution and the random variables (Z1...Z10) = (-3.03, .63, .37, -2.06, .52, -1.38, 1.16, -.64, .57, 1.31) be realizations of
Let the random variable U=.32 be a realization of a Uniform on (0,1) distribution and the random variabes (Z1...Z10) = (-3.03, .63, .37, -2.06, .52, -1.38, 1.16, -.64, .57, 1.31) be realizations of
Ingots composed of copper alloys were poured into one of three mold types with either a transverse or a longitudinal orietation. From each ingot , five tensile specimens were obtained at varying dis
Here's the question: Suppose that in a certain population of married couples 30% of the husbands smoke, 20% of the wives smoke, and in 8% of the couples both the husband and wife smoke.
Find the probability that in a family of 4 children there will be:
A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal to 25. What percentage of scores is between 15 and 25?