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It is estimated that .54 percent of the callers to the customer service department of DellInc. will recieve a busy signal. What is the probability that of todays 1,200 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
Data are recorded on effects of each drug. Is research division by using dependent or independent samples? Explain why?
Suppose you have a set of blood pressures with a mean of 80 diastolic and standard deviation of 5 points. assuming a normal distributions of blood pressures, what two values should 95% of all blood pressures lie? show work.
A store selling newspapers orders only x=4 of a certain newspaper because the manager does not get many calls for that publication. If the number of requests per day follows a Poisson distribution with mean 3.
for a certain random variable having the normal distribution the probability is 0.33 that it will take on a value less
a certain car model has a mean gas mileage of 29 miles per gallon mpg with a standard deviation of 5 mpg. a pizza
The State Department of education requires local school districts to keep records on all students within their district. Determine if the following items are categorical or numeric variables.
using two independent samples we test for a hypothesized difference between two population means. the population
Calculate sample proportion and then also calculate a 99% confidence interval for true population proportion, p.
You estimate that the probability of getting both jobs is only 0.1. What is the probability that you get exactly one of the jobs?
Over the past 50 years, the number of hurricanes that have been reported are as follows: 9 times there were 7 hurricanes, 14 times there were 8 hurricanes, 19 times there were 11 hurricanes, and in the remaining years there were 14 hurricanes. Wha..
The manager of a paint supply store wants to determine whether the mean amount of paint conatined in 1- gallon cans purchased from a nationally known manufacturer is actually 1 gallon.
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