Life Time of IC Chips manufactured by a semiconductor manufacturer is approximately normally distributed with mean = 5 × 106 hours and standard deviation of 5 x 105 hours. A mainframe manufacturer requires that at least 95% of a batch should have a lifetime greater than 4 x 106 hours. Will the deal be made?
Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…
A: Claim; μ>136mm x=148 s=15
Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…
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Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…
A: claim : μ < 130x¯ = 122s = 18 accept Ho Reject Ho Ho True correct conclusion Type I…
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Q: researcher studying stress is interested in the blood pressure measurements of chief executive…
A: The hypothesized mean is 132 mm.
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A: We have given that Sample size n =36 Sample mean =6.9 Standard deviation =2.6
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A: Population mean μ=136 mm Hg Population SD σ=16 mm Hg n=150
Q: E confidempe interval for the mean percentage
A: here given, n = sample size = 390 p^ = 0.48% z score for 95 % confidence level =1.96
Q: Unfortunately, arsenic occurs naturally in some ground water.† A mean arsenic level of ? = 8.0 parts…
A: mu=8, n=36, Xbar=7.1, s=2.2, Ho:mu=8 vs H1: mu<8 We use t statistic
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Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…
A: Answer Given The mean systolic blood pressure, , of CEOs of major corporations is more than 134 mm…
Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…
A: The test to be carried out will be- H0:μ is 132 H1:μ is less than 132 Type-II error occurs when the…
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Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…
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A: Claim is that the mean systolic blood pressure of CEOs of major corporation is less than 134 mm Hg.…
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Q: Unfortunately, arsenic occurs naturally in some ground water.† A mean arsenic level of μ = 8.0 parts…
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A: Given Population Mean, μ=136 Sample Mean, x=130 Sample sd, s=15
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Q: variance, standard deviation and coefficient of variation.
A: Here use formula of standard deviation and mean
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- A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOS) of major corporations. He has good reason to believe that the mean systolic blood pressure, u, of CEOS of major corporations is less than 130 mm Hg, which is the value reported in a possibly outdated journal article. He plans to perform a statistical test. He measures the systolic blood pressures of a random sample of CEOS of major corporations and finds the mean of the sample to be 120 mm Hg and the standard deviation of the sample to be 15 mm Hg. Based on this information, complete the parts below. (a) What are the null hypothesis H, and the alternative hypothesis H, that should be used for the test? H :0 OUnfortunately, arsenic occurs naturally in some ground water.† A mean arsenic level of μ = 8.3 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 41 tests gave a sample mean of x = 7.3 ppb arsenic, with s = 2.4 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8.3 ppb? Use ? = 0.01. (a) What is the level of significance? State the null hypotheses H0 and the alternate hypothesis H1 . H0 : μ ---Select--- < ≥ ≤ = > ≠ H1 : μ ---Select--- < > ≤ ≥ = ≠ (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. The standard normal, since the sample size is large and σ is known.The Student's t, since the sample size is large and σ is known. The standard normal, since the sample size is large and σ is unknown. The Student's t, since the…A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOs) of major corporations. He has good reason to believe that the mean systolic blood pressure, μ, of CEOs of major corporations is different from 132 mm Hg, which is the value reported in a possibly outdated journal article. He plans to perform a statistical test. He measures the systolic blood pressures of a random sample of CEOs of major corporations and finds the mean of the sample to be 124 mm Hg and the standard deviation of the sample to be 20 mm Hg. Based on this information, complete the parts below. A. H0: H1: B. Suppose that the researcher decides to reject the null hypothesis. Would the research be making a type I or type II error?The mean life span of an African savanna elephant in the wild used to be 60 years. A recent sample of 15 deceased elephants in the wild yielded a mean life span of 62 years. Assume a normally distributed population with = 6 years. Test if the population mean life span of African savanna elephants has increased, using a = 0.05. Select one: O a. p-value = 0.0984, do not reject Ho. O b. p-value = 0.0984, reject Ho. c. p-value = 0.1968, do not reject Ho. d. p-value = 0.4522, do not Reject Ho.A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.1 years, and standard deviation of 2.2 years. The 8% of items with the shortest lifespan will last less than how many years? Please show your answer to one decimal place. # of years =The mean age of a random sample of 70 adults is 55yrs with SD=7yrs •Find a 95%CI, 90% & a 99%A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOS) of major corporations. He believes that the mean systolic blood pressure, H, of CEOS of major corporations is less than 136 mm Hg, which is the value reported in a possibly outdated journal article. He plans to perform a statistical test. He measures the systolic blood pressures of a random sample of CEOs of major corporations and finds the mean of the sample to be 128 mm Hg and the standard deviation of the sample to be 16 mm Hg. Based on this information, answer the questions below. What are the null hypothesis (H) and the alternative hypothesis (H,) that should be used for the test? |Ho: H is ? |H,: µ is ? In the context of this test, what is a Type II error? A Type II error is ? fact, µ is ? v the hypothesis that u is ? when, in Suppose that the researcher decides not to reject the null hypothesis. What sort of error might he be making? ? Continue Save For Later Submit…A manufacturer of phone batteries determines that the average length of talk time for one of its batteries is 470 minutes. Suppose that the standard deviation is known to be 32 minutes and that the data are approximately bell-shaped. Estimate the percentage of batteries whose talk time is between 406 minutes and 534 minutes. Estimate the percentage of batteries whose talk time is less than 438 minutes. Estimate the percentage of batteries whose talk time is more than 534 minutes. answer in excelFrom generation to generation, the mean age when smokers first start to smoke varies. However, the standard deviation of the age when smokers first start to smoke remains constant at around 2.1 years. The American Lung Association claims that the mean age when smokers first start to smoke is at least 17. A survey of 40 randomly selected smokers of this generation was done and it was found that the mean age when smokers first started to smoke was 18.1. Is there enough evidence to reject the claim? Describe what a Type I error is for this situation. Describe what a Type II error is for this situation.A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOs) of major corporations. He has good reason to believe that the mean systolic blood pressure, μ, of CEOs of major corporations is different from 132 mm Hg, which is the value reported in a possibly outdated journal article. He plans to perform a statistical test. He measures the systolic blood pressures of a random sample of CEOs of major corporations and finds the mean of the sample to be 124 mm Hg and the standard deviation of the sample to be 20 mm Hg. Based on this information, complete the parts below. Suppose the true mean systolic blood pressure of CEOs of major corporations is 132 mm Hg. Fill in the four blanks to describe a Type I error. 1. A Type I error would be (rejecting) or (failing to reject) the hypothesis 2. that μ is (less than) (less than or = to) (greater than) (greater than or = to) (not = to) or (= to) 3. the number (124) (132) or (20)…On an exam, there is a mean score of 80 with a standard deviation of 12 If each exam is multiplied by 1.2, what will mean and standard deviation be? Please show computationIn 2017, the entire fleet of light‑duty vehicles sold in the United States by each manufacturer must emit an average of no more than 9090 milligrams per mile (mg/mi) of nitrogen oxides (NOX) and nonmethane organic gas (NMOG) over the useful life (150,000150,000 miles of driving) of the vehicle. NOX ++ NMOG emissions over the useful life for one car model vary Normally with mean 8484 mg/mi and standard deviation 66 mg/mi. (a) What is the probability that a single car of this model emits more than 9090 mg/mi of NOX ++ NMOG? (Enter your answer rounded to four decimal places.) (b) A company has 1616 cars of this model in its fleet. What is the probability that the average NOX ++ NMOG level ?¯x¯ of these cars is above 9090 mg/mi? (Enter your answer rounded to four decimal places.)