Question 7 In a random sample of 62 items produced by a machine, the quality control...
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A company makes auto batteries. They claim that 81% of their LL70 batteries are good for 70 months or longer. Assume that this claim is true. Let p be the proportion in a random sample of 70 such batteries that are good for 70 months or more. a. What is the probability that this sample proportion is within 0.02 of the population proportion? Round your answer to two decimal places b. What is the probability that this...
A random sample of n = 400 observations from a binomial population produced x = 133 successes. Give the best point estimate for the binomial proportion p. (Round your answer to three decimal places.) p̂ = Calculate the 95% margin of error. (Round your answer to three decimal places.) ______
A random sample of 400 bolts from machine A contained 36 defective bolts, while an independently chosen, random sample of 325 bolts from machine 8 contained 26 defective bolts. Let p1 be the proportion of the population of all bolt from machine A that are defective, and let p2 be the proportion of the population of all bolts from machine B that are defective. Find a 95% confidenceinterval for Pi-P2. Then complete the table below. Carry your intermediate computations to...
Suppose that when a machine is adjusted properly, 83% of the items produced by it are of high quality and the others are of medium quality. Suppose, however, that the machine is improperly adjusted during 17% of the time and that under these conditions 14% of the items produced by it are of high quality and the remaining are of medium quality. If an item is selected at random and found to be of high quality, what is the probability...
Suppose that when a machine is adjusted properly, 91% of the items produced by it are of high quality and the others are of medium quality. Suppose, however, that the machine is improperly adjusted during 13% of the time and that under these conditions 14% of the items produced by it are of high quality and the remaining are of medium quality. If an item is selected at random and found to be of high quality, what is the probability...
Question #5 A-D. Please show work!
5. The quality control department of a company has decided to select a sample of items from each shipment of goods it receives and inspect them for defects. It has been decided that if the sample contains no defective parts, the entire lot will be accepted. Thirty samples, each consisting of 200 items, were selected and examined when the shipping process was known to be operating correctly. The numbers of defective items found in...
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A random sample of 250 bolts from machine A contained 17 defective bolts, while an independently chosen, random sample of 225 bolts from machine B contained 24 defective bolts. Let p, be the proportion of the population of all bolts from machine A that are defective, and let p, be the proportion of the population of all bolts from machine B that are defective. Find a 95% confidence interval for p-p.. Then complete the table...
In a factory, machine A produces 60% of the daily output, and machine B produces 40% of the daily output. After quality control process, 2% of machine A's output is defective, and 3% of machine B's output is defective. If an item was inspected at random, 1- What is the probability that the item is defective? 2- What is the probability that the item was produced by machine A given that it was found defective?
In a random sample of 250 items, 87 are defective. If the null hypothesis is that 25% of the items in the population are defective, what is the value of ZSTAT? ZSTAT = (Round to two decimal places as needed.)
A random sample of 300 items reveals that 192 of the items have the attribute of interest. a. What is the point estimate for the population proportion for all items having this attribute? b. Use the information from the random sample to develop a 90% confidence interval estimate for the population proportion, p, of all items having this attribute of interest.