The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,508 hours. The population standard deviation is 840 hours. A random sample of 49
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The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the
hours. The population standard deviation is
A random sample of
light bulbs indicates a sample mean life of
hours.
Let
be the population mean. Determine the null hypothesis,
and the alternative hypothesis,
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- The daily yield for a local chemical plant has averaged 880 tons for the last several years. The quality control manager would like to know whether this average has changed in recent months. She randomly selects 50 days from the computer database and computes the average and standard deviation of the n = 50 yields as ?̅= 871 tons and s = 21 tons, respectively. Test the appropriate hypothesis using ? = 0.05. Calculate ? ??? ? when ? is actually equal to 870 tons. Also calculate interval estimate.On the planet of Mercury, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.4 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible. 1. 78% of all children spend at least how many hours per day unsupervised?On the planet of Mercury, 4-year-olds average 3.1 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.3 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible. b. Find the probability that the child spends less than 3.3 hours per day unsupervised. c. What percent of the children spend over 5.1 hours per day unsupervised. % (Round to 2 decimal places)d. 77% of all children spend at least how many hours per day unsupervised? hours.
- On the planet of Mercury, 4-year-olds average 2.9 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.4 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible.a. What is the distribution of X? X ~ N(_______ ,______) I know that question a is (2.9,1.4) b. Find the probability that the child spends less than 1.3 hours per day unsupervised. c. What percent of the children spend over 3.4 hours per day unsupervised. % (Round to 2 decimal places) d. 82% of all children spend at least how many hours per day unsupervised? hours. Please help me understand how to do the rest.On the planet of Mercury, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.7 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 3 decimal places where possible.a. What is the distribution of X? X ~ N(,)b. Find the probability that the child spends less than 3.3 hours per day unsupervised. c. What percent of the children spend over 3.3 hours per day unsupervised. % (Round to 2 decimal places)On the planet of Mercury, 4-year-olds average 3.1 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.6 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible.b. Find the probability that the child spends less than 1.7 hours per day unsupervised. c. What percent of the children spend over 3.7 hours per day unsupervised. % (Round to 2 decimal places)d. 74% of all children spend at least how many hours per day unsupervised? hours.
- On the planet of Mercury, 4-year-olds average 3.2 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.7 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places if not otherwise specified.c. What percent of the children spend over 4.6 hours per day unsupervised. % (Round to 2 decimal places) d. 84.85% of all children spend at least how many hours per day unsupervised? hours. (Round to 2 decimal places)On the planet of Mercury, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.4 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible.a. What is the distribution of X? b. 78% of all children spend at least how many hours per day unsupervised?On the planet of Mercury, 4-year-olds average 3.2 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.3 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible.a. What is the distribution of X? X ~ N(,)b. Find the probability that the child spends less than 1.9 hours per day unsupervised. c. What percent of the children spend over 5.2 hours per day unsupervised. % (Round to 2 decimal places)d. 88% of all children spend at least how many hours per day unsupervised? hours.
- The weights in pounds of a breed of yearling cattle follows the Normal model N(1157,77). What weight would be considered unusually low for such an animal? Select the correct choice below and fill in the answer boxes within your choice. O A. Any weight more than 2 standard deviations below the mean, or less than pounds, is unusually low. One would expect to see a steer 3 standard deviations below the mean, or less than pounds only rarely. O B. Any weight more than 3 standard deviations below the mean, or less than pounds, is unusually low. One would expect to see a steer standard deviations below the mean, or less than pounds only rarely. O C. Any weight more than 1 standard deviation below the mean, or less than pounds, is unusually low. One would expect to see a steer 2 standard deviations below the mean, or less than pounds only rarely.On the planet of Mercury, 4-year-olds average 3.1 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.6 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where possible.a. What is the distribution of X? X ~ N(,) b. Find the probability that the child spends less than 1.7 hours per day unsupervised. c. What percent of the children spend over 2.3 hours per day unsupervised. % (Round to 2 decimal places) d. 67% of all children spend at least how many hours per day unsupervised?A manufacturer makes ball bearings that are supposed to have a mean weight of 30 g. A retailer suspects that the mean weight is actually less than 30 g. The mean weight for a random sample of 16 ball bearings is 28.6 g with a standard deviation of 4.4 g. Assume the population standard deviation is not known. How many populations? O2 01 What is the parameter? O Proportion О Мean O Variance O tandard Deviation O Difference between Means
