A bulb manufacturer claims that its compact fluorescent bulbs have an average of less than 3.5...
A bulb manufacturer claims that its compact fluorescent bulbs have an average of less than 3.5 mg of mercury. A sample of 25 bulbs showed a mean of 3.39 mg of mercury. The population standard deviation is 0.18 mg. Using α = 0.1, does the sample support the manufacturer’s claim? (use both methods)
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A bulb manufacturer claims that its compact fluorescent bulbs
have an average of less than 3.5...
GreenBeam Ltd. claims that its compact fluorescent bulbs average no more than 3.45 mg of mercury....
GreenBeam Ltd. claims that its compact fluorescent bulbs average no more than 3.45 mg of mercury. A sample of 55 bulbs shows a mean of 3.57 mg of mercury. (a) State the hypotheses for a right-tailed test, using GreenBeam’s claim as the null hypothesis about the mean. H0: μ ≤ 3.45 mg vs. H1: μ > 3.45 mg (b) Assuming a known standard deviation of 0.26 mg, calculate the z test statistic to test the manufacturer’s claim. (Round your answer...
"Tarzan lights, Inc" claims that its compact fluorescent bulbs average no more than 3.50 mg of...
"Tarzan lights, Inc" claims that its compact fluorescent bulbs average no more than 3.50 mg of mercury. A sample of 25 bulbs shows a mean of 3.59 mg of mercury. As the company's statistician, you are worried that the lot may be defective for having too much mercury. Assume a known population standard deviation of 0.18, the population has a normal distribution, and a = .01. What kind of test should be done here? Seleccione una: O a. binomial test...
"Tarzan lights, Inc" claims that its compact fluorescent bulbs average no more than 3.50 mg of...
"Tarzan lights, Inc" claims that its compact fluorescent bulbs average no more than 3.50 mg of mercury. A sample of 25 bulbs shows a mean of 3.59 mg of mercury. As the company's statistician, you are worried that the lot may be defective for having too much mercury. Assume a known population standard deviation of 0.18, the population has a normal distribution, and a = .01. What kind of test should be done here? Seleccione una: O a. one tailed...
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner...
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufacturer's claim. Use α = 0.05.
General Instructions: Any hypothesis test should have five parts as illustrated in the examples in your...
General Instructions: Any hypothesis test should have five parts as illustrated in the examples in your textbook. Clearly identify each part. 1. GreenBeam Ltd. claims that its compact fluorescent bulbs average no more than 3.50 mg of mercury. Historical data reveal a standard deviation of 0.18 mg, based upon years of production records. A random sample of 24 bulbs has a mean of 3.62 mg of mercury. If we give the benefit of the doubt to GreenBeam: (a) test whether...
Suppose the manufacturer claims that the mean lifetime of a light bulb is more than 10,000...
Suppose the manufacturer claims that the mean lifetime of a light bulb is more than 10,000 hours. In a sample of 30 light bulbs, it was found that they only last 9,900 hours on average. Assume the population standard deviation is 120 hours. At 0.05 significance level, can we reject the claim by the manufacturer? Select one: a. We reject the claim b. We accept the claim
A light bulb manufacturer claims that the mean life of a certain type of light bulb is 750 hours. If a random sample of 36 light bulbs has a mean life of 725 hours with a standard deviation of 60 hours. Use a=0.05
A light bulb manufacturer claims that the mean life of a certain type of light bulb is 750 hours. If a random sample of 36 light bulbs has a mean life of 725 hours with a standard deviation of 60 hours. Use a=0.05a. State the null and alternative hypotheses.b. State the Type I and Type II errors.c. Find the critical value. Do you have enough evidence to reject the manufacturer’s claim?d. Find the p-value.e. Construct a 95% confidence interval for...
A manufacturer of light bulbs advertises that, on average, its long-life bulb will last more than...
A manufacturer of light bulbs advertises that, on average, its long-life bulb will last more than 5500hours. To test this claim, a statistician took a random sample of 90 bulbs and measured the amount of time until each bulb burned out. The mean lifetime of the sample of bulbs is 5551 hours and has a standard deviation of 420 hours. Can we conclude with 99% confidence that the claim is true? Fill in the requested information below. (a) The value...
12. A manufacturer claims that the average tensile strength of thread A exceeds the average tensile...
12. A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B by at least 12kg. To test this claim, 50 pieces of each type of thread are tested under similar conditions. Type A had a sample average tensile strength of 86.7 kg with known population standard deviation of σA =6.28kg., while type B had a sample average tensile strength of 77.8 kg with a known population standard deviation of σB =5.61kg....
Stats Hw- Please Help 3. A company that manufactures compact fluorescent light bulbs (CFL) claims that...
Stats Hw- Please Help 3. A company that manufactures compact fluorescent light bulbs (CFL) claims that they will operate for a mean of 10,000 hours with a level of significance equal to 0.05. An engineer from the company performs a test to validate this claim. The hypotheses are: Null hypothesis: μ = 10,000 hours Alternate hypothesis: μ ≠ 10,000 hours The engineer does accelerated lifetime testing on 50 of these bulbs and finds that the mean lifetime is 9875 hours...
"Tarzan lights, Inc" claims that its compact fluorescent bulbs average no more than 3.50 mg of mercury. A sample of 25 bulbs shows a mean of 3.59 mg of mercury. As the company's statistician, you are worried that the lot may be defective for having too much mercury. Assume a known population standard deviation of 0.18, the population has a normal distribution, and a = .01. What kind of test should be done here? Seleccione una: O a. binomial test...
"Tarzan lights, Inc" claims that its compact fluorescent bulbs average no more than 3.50 mg of mercury. A sample of 25 bulbs shows a mean of 3.59 mg of mercury. As the company's statistician, you are worried that the lot may be defective for having too much mercury. Assume a known population standard deviation of 0.18, the population has a normal distribution, and a = .01. What kind of test should be done here? Seleccione una: O a. one tailed...
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