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A study of the checkout lines at the Safeway Supermarket in the South Strand area revealed that between 4 and 7 P.M. on weekdays there is an average of four customers waiting in line. What is the pr
The university has decided to purchase the new brand if, when tested, the evidence supports the manufactuer claim at the .05 significance level. Suppose 49 bulbs were tested with the folowing result
An independent second stage is normally distributed with a mean of 43 minutes and variance of 10 minutes. What is the probability that the two stages take over 80 minutes?
the number of goals scored at state college hockey games follows a poisson distribution with a mean of 3 goals per game.find the probability that each of four randomly selected state college hockey
Use the data to estimate the true population mean gas tax with 90% confidence. Does your interval contain the national average of 21 cents?
In a study of 11,000 car crashes, it was found that 5720 of them occurred within 5 miles of home. Use a 0.01 significance level to test the claim that more than 50% of car crashes occur within 5 mil
Yielding a sample mean of 190.7 days and a sample standard deviation of 54.2 days. Estimate the true mean population of the growing season with 95% confidence.
A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-failures (MTBF). The manufacturer then changes a manufacturing process and produces another batch and again m
a sample of the personal files of eight male employees revealed that during a six month period they lost the following number of days due to illness 2, 0, 6, 3, 10, 4, 1, 2 calculate the standard de
The downtime per day for a certain computing facility averages 4.0 hours, with a standard deviation of 0.8 hours. Find the probability that the average daily downtime for a period of 30 days is betwee
Suppose that a highway patrol person wants to estimate the proportion of all drivers speed, and that she wants to be able to assert with probability of at least 0.95 that the error of her estimate w
the oven will cause a core to be defective? What is the probability that the temperature of the oven will range from 460 degree F to 470 degrees F?
According to U.S. Department of Transportation Data, in April of 2008, there were 253,190 complaints related to mishandling of baggage by U.S. Airlines. Mishandling includes lost, damaged, delayed,
Note that X is a binomial random variable. state the four requirements necessary to establish this and explain why each of these requirements is valid in the context of this multiple choice exam.
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
Gary Schwartz is top saleman for his company. records indicate that he makes a sale on 70% of his sales calls. If he calls on four potential clients, what is the probability that he makes exactly 3
The hypothesis is that the average number of customers served per hour is 24 or less against the alternative hypothesis that the mean number of customers waiting is greater than 24.
the number of calls received by a switch board per hour follows a poisson distribution with parameter 25. Find the probabilities that in 1 hour (a) there are between 23 and 26 calls inclusive, (b) m
If the standard deviation of back charges is $500, and alpha = 0.04, should the engineering firm be concerned? Perform an appropriate hypothesis test, showing the necessary calculations and/or expla
A shipment of 40 computers contains five that are defective. How many ways can a small business buy three of these computers and receive no defective ones?
Calculate the 95% confidence interval for the population proportion of patients who are successfully treated. (c) Write a sentence that correctly interprets this interval.
The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or b
The economist needs to know how large a sample should be taken so that a 90% confidence interval for their mean income with an error of $500 can be constructed. If the population standard deviation
The recent average starting salary for new college graduates in computer information systems is $47,500. Assume salaries are normally distributed with a standard deviation of $4,500. What is the pro
Use the normal approximation to the binomial to approximate the probability that a) exactly 96 flights are on time. b) at least 96 flights are on time.