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A random sample of 79 light bulbs had a mean life of x...
1. A random sample of 56 fluorescent light bulbs has a mean life of 645 hours....
1. A random sample of 56 fluorescent light bulbs has a mean life of 645 hours. As- sume the population standard deviation is 31 hours. a) Construct a 95% confidence interval for the population mean. b) If one of the light bulbs only lasted 620 hours, would that be unusual? c) If the population mean of the all of the light bulbs turned out to be 620 hours, would you be surprised?
4) A random sample of 7 brand X light bulbs had a mean life of 891...
4) A random sample of 7 brand X light bulbs had a mean life of 891 hours and a variance of 9201 hours. A random sample of 10 brand Y light bulbs had a mean life of 592 hours and a variance of 4856 hours. Test the null hypothesis that the true variance of brand X bulbs equals the true variance of brand Y bulbs against the alternate hypothesis that the true variance of X exceeds the true variance of...
Use the confidence level and sample data to find a confidence interval for estimating the population....
Use the confidence level and sample data to find a confidence interval for estimating the population. Round your answer to the same number of decimal places as the sample mean A random sample of 87 light bulbs had a mean life of 479 hours with a standard deviation of a = 30 hours. Construct a 90% confidence interval for the mean life, ja, of all light bulbs of this type O A 472 hr < < 486 he B. 474...
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...
= 25 hours. A random sample of 22 bulbs The life in hours of a 75-watt...
= 25 hours. A random sample of 22 bulbs The life in hours of a 75-watt light bulb is known to be normally distributed with has a mean life of K = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a). Round your...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs,...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 11 bulbs of model A showed a mean lifetime of 1345 hours and a standard deviation of 102 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1389 hours and a standard deviation of 82 hours. Assume that the populations of lifetimes for each...
A company manufactures light bulbs. The company wants the bulbs to have a mean life span...
A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 991 hours. This average is maintained by periodically testing random samples of 16 light bulbs. If the t-value falls between -t0.95 and t0.95, then the company will be satisfied that it is manufacturing acceptable light bulbs. For a random sample, the mean life span of the sample is 999 hours and the standard deviation is 22 hours. Assume that life spans are approximately...
The quality control manager at a light bulb factory needs to estimate the mean life of...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 92 hours. A random sample of 64 light bulbs indicated a sample mean life of 360 hours. Complete parts (a) through (d) below. that the lightbulbs have a mean life of 410 hours. c. Must you assume that the population light bulb life is normally distributed? Explain. O A. Yes, the sample size is...
The quality control manager at a light bulb factory needs to estimate the mean life of...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 98 hours. A random sample of 49 light bulbs indicated a sample mean life of 300 hours. (a) Construct a 99% confidence interval estimate for the population mean life of light bulbs in this shipment. The 99% confidence interval estimate is from a lower limit of 263.9 hours to an upper limit of 336.1...
please answer neatly and correctly! light bulb manufacturer wants to compare the mean lifetimes of two...
please answer neatly and correctly!
light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 9 bulbs of model A showed a mean lifetime of 1234 hours and a standard deviation of 81 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1391 hours and a standard deviation of 110 hours. Assume that the populations...
1. A random sample of 56 fluorescent light bulbs has a mean life of 645 hours. As- sume the population standard deviation is 31 hours. a) Construct a 95% confidence interval for the population mean. b) If one of the light bulbs only lasted 620 hours, would that be unusual? c) If the population mean of the all of the light bulbs turned out to be 620 hours, would you be surprised?
4) A random sample of 7 brand X light bulbs had a mean life of 891 hours and a variance of 9201 hours. A random sample of 10 brand Y light bulbs had a mean life of 592 hours and a variance of 4856 hours. Test the null hypothesis that the true variance of brand X bulbs equals the true variance of brand Y bulbs against the alternate hypothesis that the true variance of X exceeds the true variance of...
Use the confidence level and sample data to find a confidence interval for estimating the population. Round your answer to the same number of decimal places as the sample mean A random sample of 87 light bulbs had a mean life of 479 hours with a standard deviation of a = 30 hours. Construct a 90% confidence interval for the mean life, ja, of all light bulbs of this type O A 472 hr < < 486 he B. 474...
= 25 hours. A random sample of 22 bulbs The life in hours of a 75-watt light bulb is known to be normally distributed with has a mean life of K = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a). Round your...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 11 bulbs of model A showed a mean lifetime of 1345 hours and a standard deviation of 102 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1389 hours and a standard deviation of 82 hours. Assume that the populations of lifetimes for each...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 92 hours. A random sample of 64 light bulbs indicated a sample mean life of 360 hours. Complete parts (a) through (d) below. that the lightbulbs have a mean life of 410 hours. c. Must you assume that the population light bulb life is normally distributed? Explain. O A. Yes, the sample size is...
please answer neatly and correctly!
light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 9 bulbs of model A showed a mean lifetime of 1234 hours and a standard deviation of 81 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1391 hours and a standard deviation of 110 hours. Assume that the populations...
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