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A market research firm did a report about the residential telephone numbers in New York State, which says 54% of all residential telephone number in NY are unlisted. A telemarketing company uses random digit dialing equipment that dials the residential numbers at random, regardless of whether they are listed. The firm calls 1000 numbers in NY. What is the probability that at least half of the numbers called are unlisted?
at a track and field tournament freds long jumps vary evenly from 6.5 to 7.2 meters. let x be the length of freds long
Entire commercial airline industry, consider a random sample of 200 flights. What is the expected number that will arrive on time? What is the standard deviation of this distribution.
If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?
1. two manufacturing plants produce similar parts. plant 1 produces 1000 parts 100 of which are defective. plant 2
Scores are normally distributed with a mean of 460 and standard deviation of 80. The top 2.5 percent of the applicants would have a score of at least.
The manufacture of the X-15 steel belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles.
Using the 0.05 level of significance, is there evidence that the population mean is above $190? What is your answer in (a) if s = $50 and the 0.10 level of significance is used?
From these we calculate = 129.44; = 122.65; sx = 9.15; sy = 11.02. Perform the test H0: against the alternative H1:, using the two sample t-test, and state any assumptions you may require to do this test.
A department store, on average, has daily sales of $29,876.76. The standard deviation of sales is $1000.00. On Tuesday, the store sold $34,893.71 worth of goods.
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
A sample of 15 workers revealed the following number of minutes traveled. Develop a 98 percent confidence interval for the population mean. Interpret the result. Please explain how you calculate.
a study is conducted to determine whether sunshine affects depression. eight individuals are given a questionnaire
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