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When circuit boards used in the manufacture of compact disc players are tested, the long-run percentage of defectives is 5%. Let X = the number of defective boards in a random sample of size n = 25
At least 6 of the calls involve a fax message? More than 6 of the calls involve a fax message? What is the expected number of calls among the 25 that involve a fax message?
Flights on a certain route are on time 85% of the time. Suppose 9 flights are randomly selected and the number of on time fligghts is recorded. Use technology to find the probabilities. Determine w
In the binomial probability distribution, let the number of trials be n = 3, and let the probability of success be p = 0.4471. Use a calculator to compute the following.
Houses with and without air conditioners on nine different streets in a certain city are shown below. Test (at the 5% level) the null hypothesis that having an air conditioner is independent of stre
A student observes the elevator usage of a building with a single elevator. This elevator will only allow people to go from the main floor to the 10th of the building.
Select a company (maybe your employer) and assess how it uses data in marketing its products or services. (If it is not your employer, find a sizable local company or search the Internet for a compa
A building is designed to resist loading from earthquakes. The capacity (in terms of force factor) is assumed to follow a lognormal distribution with a median of 6.5 and a standard deviation of 1.5.
Construct a confidence interval of the population proportion at the given level of confidence X= 540, N = 1200, 90% confidence
Sixty people will board a regional jet. The mean weight of the population is 150 pounds with a standard deviation of 30 pounds. Calculate the approximate probablility that the mean weight of 60 pass
An electronic product contains 25 integrated circuits. The probability that any integrated circuit is defective is 0.01 and the integrated circuits work independently. Suppose that X denotes the num
How many students studied between 2.2 hours and 7 hours? What percentage of the students studied for more than 5.8 hours?
A study is conducted to compare three new appetite suppressants (A, B, and C) to a placebo in terms of their effects on weight reduction. A total of 80 participants are involved and are randomly ass
You want to estimate the standard deviation of the population of current Annual incomes of adults in the United States. Find the minimum sample size needed to be 99% confident that the sample stand
Find the sampling distribution and PDFs of Ysub1 and Ysubn for random samples of size n from a continous uniform population with alpha=0 and beta=1.
According to CNN/USA Today poll appox. 70% of Americans believe the IRS abuses its power. Let X equal the number of people who believe the IRS abuses its power in a sample of n=25 Americans. Assumin
An inspector chooses a sample of parts coming from an automated lathe by visually inspecting all parts, and then including 10 percent of the "good" parts in the sample with the use of a table of r
Find the probability distribution that in a random sample of size n=4 from continous uniform population with alpha=0 and beta=1, the smallest value will be atleast 0.20.
Find the sample size needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.03 margin of error, use confidence level 0f 98%, and use results from prior Pew research
In a tire factor, the quality control inspector examines a randomly chosen sample of 15 tires. When more than one defective tire is found, production is halted, the existing tires are recycled, and
What percent of the students use the library frequently? Suppose you see a student use the library everyday. What is the probability that this student is a freshman?
An automobile insurance firm wants to find the average amount per claim for auto body repairs. Its summary records combine amounts for body repair with all other amounts, so a sample of individual c
What is the probability of getting a sum of 6? (Enter your answer as a fraction.) What is the probability of getting a sum of 4? (Enter your answer as a fraction.