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The Comfort Widget Company makes several different sized widgets. The smallest widget the company manufactures has a mean diameter of 2.35 inches with a standard deviation of .25 inches. The distr
A company wants to check the consistency of electronic copies of signatures for consumer credit purchases. A sample of 49 electronic signatures are available from the same customer.
Let X denote the amount of time in hours a book on two-hour reserve is actually checked out, and suppose the cdf is
The rate of return for na investment can be described by a normal distribution with mean 47% and standard deviation 3%. What is the probability that the rate of return for the investment exceeds 53%
A new phone answering system for a company is capable of handeling seven calls every 10 minutes. Prior to installing the new system, company analyst determined that the incoming calls to the system
Among nine nominees for three vacancies on a city council are five men and four women. In how many ways can these vacancies be filled
A random sample of 12 second-year university students enrolled in a business statistics course wasdrawn. At the course's completion, each student was asked how many hours he or she spent doinghomewo
A study found that 41% of assisted reproductive technology (ART) cycles resulted in pregnancies. Twenty-six precent of the ART pregnancies resulted in multiple births.
Suppose 40% of the vehicles passing through a toll booth are trucks and the rest are cars. A truck pays a $5 toll whereas a car pays $3. Find the expected revenue from the next vehicle that passes thr
A Bright Idea. A company produces lightbulbs whose life follows the N(1500; 300) distribution, i.e. the lifetimes of lightbulbs have a normal distribution with a mean of 1500 hours and a standard de
Weekly demand at a grocert store for a brand of cereal is normally distributed according to X ~ N (800 boxes, 75^2 boxes)
For each of the following, find the probability for the given normal distirbution:
A random sample of 35 GMAT scores for applicants to an MBA program has a mean score of 479. The researcher is interested in finding evidence at the .05 level that the mean score of applicants to the
The proportion of all American teenagers who have a television in their bedrooms. The proportion of these 2032 teenagers who have a television in their bedrooms
Suppose that you want to estimate the average age of the residents in your community. Is this number a parameter or a statistic? Explain.
The probability of not detecting the impurity if it is absent is .90. The prior probabilities of the impurity being present and being absent are .40 and .60, respectively. Three separate experiments
Suppose the incubation period for land turtle eggs is normally distributed with a mean of sixty-seven days and standard deviation of 7.4 days:
Ten trials are conducted in a Bernoulli process in which the probability of success in a given trial is 0.3. If x = number of successes, find:
A patient receiving a yearly physical examination and must have 16 checks or tests performed. The sequence in which the tests are conducted is important because the time lost between test will vary
Website visitors are often loath to disclose personal information when making a purchase on the Internet. Despite safeguards in place, nearly 60% of all consumers who make purchases on the Internet
The auto parts department of an automotive dealership sends out an average of 8 special orders daily. The number of special orders is assumed to follow a Poisson distribution.
Calculate the probability that at least 12 in a sample of 20 first-time buyers would take out no-money-down loans if San Francisco's proportion is the same as the nationwide proportion of no-money-d
If the sample variance is s2 = 64, then conduct a hypothesis test to evaluate the significance of the treatment effect and calculate r2 to measure the size of the treatment effect. Use a two-tailed
A researcher selects a sample from a population with m = 30 and uses the sample to evaluate the effect of a treatment. After treatment, the sample has a mean of M = 32 and a variance of s2= 6. Which
You are collecting data, asking participants about their religious background. Choices include: Christian, Jewish, Muslim, Buddhist, Hindu, Atheist, Agnostic, Pagan, and Other. Which measures of cen