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Question: Yunan Corporation produces bolts that are supplied to other companies. These bolts are supposed to be 4 inches long. The machine that makes these bolts does not produce each bolt exactly 4 inches long. It is known that when the machine is working properly, the mean length of the bolts made on this machine is 4 inches. The standard deviation of the lengths of all bolts produced on this machine is always equal to .04 inch. The quality control department takes a sample of 20 such bolts every week, calculates the mean length of these bolts, and makes a 98% confidence interval for the population mean. If either the upper limit of this confidence interval is greater than 4.02 inches or the lower limit of this confidence interval is less than 3.98 inches, the machine is stopped and adjusted. A recent such sample of 20 bolts produced a mean length of 3.99 inches. Based on this sample, will you conclude that the machine needs an adjustment? Assume that the population distribution is normal.
Determine the percent of the days is the price between $38.00 and $40.00?
based on the number of voids a ferrite slab is classified as either high medium or low. historically 5 of the slabs
The following table is from the Social Security Actuarial Tables. For each age, it gives the probability of death within one year, the number of living out of an original 100,000 and the additional life expectancy for a person of that age.
Given two continuous random variables X and Y, use Theorem 4 to express E(X) in terms of (a) the joint density of X and Y; (b) the marginal density of X.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
a company manufacturing cds is working on a new technology. a random sample of 718 internet users were asked as you may
A part is produced with a mean of 6.2 ounces and a standard deviation of 0.2 ounce. What is the probability that the weight of 100 such items is between 6 l6 and 624 ounces?
Explain the use of and and or in probabilities. How would you change your calculation based on the language of the problem?
Valuation of an MNC Yahoo! has expanded its business by establishing portals in numerous countries, including Argentina, Australia, China, Germany, Ireland, Japan, and the United Kingdom.
The population standard deviation was 1.68 years. Using the 99% degree of confidence, what is the confidence interval for the population mean.
a. What is the null hypothesis for this test? b. What is the alternative hypothesis for this test? c. Is this a one-sided or two-sided test? How do you know? d. Will you use a z-test or a t-test in this situation? Why?
Between 180 and 230 (inclusive) of the drivers in the sample regularly wear a seatbelt? Hint: Use the BINOMDIST function in Excel.
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