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A national grocer's magazine reports the typical shopper spends nine and half minutes in line waiting to check out. A sample of 15 shoppers at the local Farmer Jack's showed a mean of 4.2 minutes with a standard deviation of 3.8 minutes. Is the waiting time at the local Farmer Jack's less than that reported in the national magazine? Use the 0.01 significance level.
(a) What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) Reject H0: µ ? 9.5 and fail to reject H1: µ < 9.5 when the test statistic is.
(b) The value of the test statistic is . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
What sample size would be needed to estimate he population mean to within one-half standard deviation with 95% confidence?
question in a city in italy 30 of the families have a mastercard 20 have an american express card and 25 have a visa
two models of color tv sets designated alpha and beta are produced by allison company. the profit on alpha is 300 and
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 70,000 miles and a standard deviation of 7,000 miles. What is the probability of having a tire that lasts more than 80,000 miles?
Cards are drawn one by one from a standard deck of 52 cards. Let X be the number of draws up to and including when the first diamond is drawn. If the cards are replaced in the deck, determine E(X). If the cards are not replaced in the deck, determ..
in a second grade class containing 12 girls and 10 boys 2 students are selected at random to give out the math papers.
Determine whether P constitutes a Bayesian network with the DAG X -> Y -> Z: Determine whether P constitutes a Bayesian network with the DAG X -> Z
Write a sample result section, discussing your data screening activity (this section should be in APA format).
use the frequency distribution table below that shows the results from a survey which asked 200 households how many
would this prove that they are exceeding their goal, using α = .025?
ACME will incur the cost of replacement, but will not receive any additional revenue. What is the profit earned/loss incurred on an all weather tire that exceeds 40,000 miles?
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