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An industrial engineer has determined that the proper model for the number of defectives produced per hour in a production process is a Poisson distribution with average value (lambda) of 4.0 units
A researcher interviews 233 of the 200,000 Florida voters whose ballots were not counted in the 2000 USA presidential election. The number Y of voters in the sample of 233 who voted for Al Gore has
A relative frequency histogram having classes of greatly different class widths was used as an estimator of a continuous population pdf. The relative frequency was plotted versus the class intervals
An engineer for an automotive manufacturer is studying the occurrence of breakdowns in assembly lines. From 5 years of data he finds that the number of breakdowns in any 10-minute interval is indepe
A study is conducted to determine the level of confidence the public has in the ability of the federal government to respond to a natural disaster. A random sample of 500 people was taken from each
From a group of 6 women and 8 men a committee consisting of 3 men and 3 women is to be formed. How many different committees are possible if
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