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The maker of refrigerators buys bolts from two suppliers, and it is very important that the mean widths of the bolts received from both suppliers are equal since they must be used interchangeably. The refrigerator maker receives a large shipment of volts from each supplier and draws a random sample of 49 bolts from each shipment. The refrigerator maker wants to test whether the mean width is the same in both shipments.
a)State the Null and the Alternate Hypothesis:
b)Is the Alternate Hypothesis one-sided or two sided?
Suppose that the refrigerator manufacturer finds that the mean width of the bolts taken from the one shipment is 1.14 inches, and that the mean width of the bolts taken from the other shipment is 1.09 inches. The standard deviation of the widths of bolts in each 0.10 inches. Based on this experience, should the manufacturer reject the hypothesis that the mean widths are equal. Test the hypothesis at the .o5 significance level.
c)What is the test statistic?
d)What is your decision regarding Ho?
Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1.
Given length an athlete throws a hammer is a normal random variable with mean 50 feet and standard deviation five feet, what is the probability he throws it: Between 50 feet and 60 feet.
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The national average SAT score (for Verbal and Math) is 1028. Suppose that nothing is known about the shape of the distribution and that the standard deviation is 100. If a random sample of 200 scores were selected and the sample mean were calcula..
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She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
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What is the critical value for a two-tailed F-Test with a=0.10, when the sample size from which the variance for the numerator was obtained was 10,
What kind of probability uses sample spaces to find out numerical probability that event will happen?
Four different types of fertilizers are used on raspberry plants. The number of raspberries on each randomly selected plaint is given below.
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
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