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An information center provides services in bilingual languages; requests for service arrive by telephone. Major language service requests and minor language service requests arrive according to inde
A telemarketer with B2B Communications has a 20 percent historical probability of making a sale during a shift where 100 calls were made.
A contractor wishes to set up a special fund by making uniform semiannual end-of-period deposits for 20 years. The fund is to provide $10,000 at the end of each of the last 5 years of the 20-year pe
On a mathematics test in a high school, scores are normally distributed with a mean of 77 and a standard deviation of 16.8. A student is randomly selected.
Assume a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses, Statistics a 4 credit hour cour
What is the power of a two-tailed test at the 0.05 level, difference of 25, standard deviation of 10, and sample size of 100? Assume outcomes are normally distributed.
What sample size in each of two groups is needed to detect a difference in the true means from each group of 10 with a two-tailed test at the 0.05 level, a power of 0.90, and standard deviation of 1
A researcher measures eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements? mean, median, mode or any 3?
In how many ways can a committee of 4 be formed from 10 men and 12 women if it is to have
The time between process problems in a manufacturing line is exponentially distributed with a mean of 30 days.
Suppose that Crown Bottling Company decides to use a level of significance of = .01, and suppose a random sample of 36 bottle fills is obtained from a test run of the filler.
Find the probability that an individual time is greater than 4.00 seconds. Find the probability that the mean for 60 randomly selected times is greater than 4.00 seconds
Suppose there are five jars, and five stones are placed into the jars at random. What is the probability that no jar contains more than one stone?
Suppose we have a group of 10 people, and I have $600 that I want to distribute to 3 of the 10 people. How many different ways can I give $200 to each of three people?
Explain how two sets of data could have equal means and modes but still differ greatly. Give an example with two data sets to illustrate.
An airline carriers 300 passengers and has doors with a height of 76 inch. Heights of men are normally distributed with a mean of 69.0 in and a standard deviation of 2.8 in.
If 31 different piolts are randomly selected, find the probability that their mean weight is between 130 lb and 171 lb.
The goal at U.S. airports handling international flights is to clear these flights within 45 minutes. Let's interpret this to mean that 95 percent of the flights are cleared in 45 minutes, so 5 perc
If 280 different coins are inserted into the vending machine, what is the expected number of rejected coins. The number of rejected coins is __ . (Round to the nearest integer.
Ten individuals are candidates for positions of president, vice president of an organization. How many possibilities of selections exist?
There are three candidates for a position. The candidates are interviewed independently by each member of a three person committee. A candidate will be hired if she is ranked first by at least two m
What sample size is needed to detect a correlation coefficient as small as 0.50 with a two-tailed test at the 0.05 alpha level with 90% power?
What is the power of a two-tailed test of a correlation coefficient (Ho: ?=0, Ha: ? ?0) at the 0.05 level if the sample size is 40 and the true correlation is 0.35?
Suppose 10 gonorrhea cases are reported over a 3-month period among 10,000 people living in an urban county. The statewide incidence of gonorrhea is 50 per 100,000 over a 3-month period. Is the numb
Annual returns on the more than 5000 common stocks available to investors vary a lot. In a recent year, the mean return was 8.3% and the standard deviation of returns was 28.5%. The law of large num