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The branch manager for United Savings and Loan in Seaside, Virginia, has worked with her employees in an effort to reduce the waiting time for customers at the bank. Recently, she and the team concluded that average waiting time is now down to 3.5 minutes with a standard deviation equal to 1.0 minute. However, before making a statement at a managers' meeting, this branch manager wanted to double-check that the process was working as thought. To make this check, she randomly sampled 25 customers and recorded the time they had to wait. She discovered that mean wait time for this sample of customers was 4.2 minutes.
Based on the team's claims about waiting time, what is the probability that a sample mean for n = 25 people would be as large or larger than 4.2 minutes? What should the manager conclude based on these data?
An advertisement for Cold-Ex claims an 80 percent end-of-treatment clinical success rate for the treatment of flu. Twelve flu patients are given Cold-Ex and are later checked to see if the treatment was successful. Let's assume that the claim ..
The Bombay Company offers reproductions of classic 18th- and 19th-century English furniture pieces, which have become popular in recent years. The following table gives the probability distribution of the number of Raffles tables sold per day at ..
using a table of critical t-values of the t distribution find the range of values for the p-value for testing a claim
The following data show samples of three chain stores in three different locations in one town and the amount of dollars spent per customer per visit. At the 0.05 level, is there a difference in among the means?
u.s. bureau of the census data reveal the largest town in the state of oh has a population of one million families. the
A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 10 children selected at random and finds that their mean attention span is 33 minutes with a standard deviation of 6 minutes.
suppose that two dierent tests a and b are to be given to a student chosen at random from a certain population. suppose
a student club has 40 members including stacy and tom.a in how many ways can the club elect different individuals to
a baseball player in the major leagues who plays regularly will have about 500 at bats that is about 500 times he can
1 the cincinnati enquirer reported that in the united states 66 of adults and 87 of youths ages 12 to 17 use the
A police department reports that the probabilities that 0, 1, 2, and 3 burglaries will be reported in a given day are 0.49, 0.42, 0.06 and 0.03, respectively. What is the mean of the given probability distribution?
What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
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