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The operation manager at the light bulb factory wants to determine whether there is any difference in the average life expectancy of bulbs manufactured on two different types of machines. The process standard deviation of Machine 1 is 110 hours and of Machine II is 125 hours. A random sample of 25 light bulbs obtained from Machine 1 indicates a sample mean of 375 hours, and a similar sample of 25 from Machine II indicates a sample mean of 362 hours.
(a) Using the 0.05 level of significance, is there any evidence of a difference in the average life of bulbs produced by the two types of machines?
Finding probability for the given values of the uniform density curve
Find the probability that the mean weight of those loads is less than 42.00 tons. Assume that the variable is normally distributed.
What is the probability that 25% or fewer male employees will indicate that they have to pick up the slack for moms working flextime?
Last year the average deposit for all 10,000 clients was $25,000 with a standard deviation of $30,000. Do you think a small sample of 25 is enough to give them the margin of error they want? If not, how large a sample do you suggest they need to t..
What is the probability that she gets exactly 4 bull's-eyes? How many bull's-eyes do you expect her to get out of the 6 arrows and what is the standard deviation?
Three are selected, at random, without replacement from the batch. What is the probability that the third is not defective given that one of the previous two are defective?
He asks you to develop a proposal for the study and submit it to him. Develop the management-research question hierarchy that will help you to develop a specific proposal.
Cholesterol levels for women follow a normal distribution with mean = 185 mg/dL and standard deviation = 50 mg/dL. What percent of women have cholesterol levels above 240?
What is the standard deviation of the sampling distribution of the sample mean x if a sample of 64 students is selected at random from the entire freshman class?
Your customers have been divided into 3 groups. The first group represents 15% of customers, and these customers spent an average of $29.76 last year.
Suppose in a population of 100,000, the probability that an individual will die from bird flu in a given winter is .00009. If the data fits a Poisson distribution, then the mean number of people in that population that will die from bird flu in on..
A product sold by Home Depot, Inc., with an annual demand of 1000 units has Co = $25.50 and Ch = $8. The demand exhibits some variability such that the lead-time demand follows a normal probability distribution
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