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A courier service advertises that its average delivery time is less than 6 hours for local deliveries. A random sample of times for 12 deliveries to an address across town was recorded. These data are shown here. Is this sufficient evidence to support the courier's advertisement, at the 5% level of significance? 3.03, 4.33, 6.50, 5.22, 3.56, 6.76, 3.98, 4.82, 3.96, 4.54, 5.09, 6.46
What are the lower and upper specifications limits (a, b) such that only 2.5% of the pistons ring would exceed the limits. What is the power of the test if the true mean shifts by one standard deviation?
Little Kona is a small coffee corporation that is planning entering a market dominated through Big Brew. Each corporation's profit depends on whether Little Kona enters and whether Big Brew sets a high price or a low price.
A worker faces a review every year. He prefers to spend time making if he will be reviewed; otherwise he would prefer to use time somewhere else.
An injection molding machine produces golf tees that are 20.0% nonconforming. Using the normal distribution as an approximation to the binomial, find the probability that, in a random sample of 360 golf tees, 65 or less are nonconforming. Show you..
According to a survey, only 15% of customers who visited the web site of a major retail store made a purchase. Random samples of size 50 are selected.Referring to the information, the average of all the sample proportions of customers who will mak..
The national average for a new car loan is 8.28%. If the rates are normally distributed with a standard deviation of 3.5%, find the probability one can receive a rate less than 9%
A 5-card poker hand is said to be a full house if it consists of 3 cards of the same denomination and two other cards of the same denomination(of course,different from the first denomination). How many hands of full house are possible?
There is 0.02% probability that a credit card holder of a company reports the loss or theft of the credit card each month. The company has 15,000 credit cards in Memphis. Use the Poisson distribution to answer the following questions.
Ken and Gerard are roommates for a weekend and have succeeded in making their living quarters cluttered in very little time.
If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evidence to reject the claim that the lab technician's accuracy is within the target accuracy?
Find a real-world example where the uncertain quantity you are interested in can be modeled as a random variable with exponential distribution. Explain why the memoryless property indeed holds.
The market for olive oil in new York City is controlled by 2-families, Sopranos and Contraltos. Both families will ruthlessly eliminate any other family that attempts to enter New York City olive oil market.
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