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QUESTION 9 It is known that the variance of a population equals 1444. A random sample...
QUESTION 10 1. It is known that the standard deviation of a population equals 30. A...
QUESTION 10 1. It is known that the standard deviation of a population equals 30. A random sample of 85 observations is going to be taken from the population. Compute the margin of error corresponding to a 99% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 11 The average score of a sample of 50 senior business majors at UTC who took the Graduate Management Admission Test was 510 with...
1)A random sample of 225 observations showed a mean of 25. The population variance is 961 Compute the lower limit of the...
1)A random sample of 225 observations showed a mean of 25. The population variance is 961 Compute the lower limit of the 93% confidence interval. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. 2) If the population standard deviation of the lifetime of a vacuum cleaner is 300 hours, how large of a sample must be taken in order to be 90% confident that the margin of error will not exceed 50 hours?
A random sample of 49 observations is used to estimate the population variance. The sample mean a...
A random sample of 49 observations is used to estimate the population variance. The sample mean and sample standard deviation are calculated as 59 and 3.1, respectively. Assume that the population is normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Construct the 90% interval estimate for the population variance. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence interval b. Construct the...
A random sample of 43 observations is used to estimate the population variance. The sample mean...
A random sample of 43 observations is used to estimate the population variance. The sample mean and sample standard deviation are calculated as 68.5 and 3.1, respectively. Assume that the population is normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Construct the 95% interval estimate for the population variance. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence interval to b. Construct...
All the savvy business statisticians know that the variance of a population equals 1780. A random...
All the savvy business statisticians know that the variance of a population equals 1780. A random sample of 121 observations is going to be taken from the population. a. With a 0.95 probability, what statement can be made about the size of the margin of error? b. With a 0.95 probability, how large of a sample would have to be taken to provide a margin of error of 8 or less? PLEASE SHOW DETAILED WORK ON EACH ANSWER
In order to construct a confidence interval for the population variance, a random sample of n...
In order to construct a confidence interval for the population variance, a random sample of n observations is drawn from a normal population. Use this information to find χ2a/2, df and χ21 L 2, df under the following scenarios. (Round your answers to 3 decimal places. You may find it useful to reference the appropriate table: chi-square table or Ftable) a/2,d.f X"1-a/2,df a. A 90% confidence level with n- 17. b. A 90% confidence level with n- 28. C. A...
In order to construct a confidence interval for the population variance, a random sample of n...
In order to construct a confidence interval for the population variance, a random sample of n observations is drawn from a normal population. Use this information to find χ2α/2,df and χ21-α/2,df under the following scenarios. (Round your answers to 3 decimal places. You may find it useful to reference the appropriate table: chi-square table or F table) χ2α/2,df χ21-α/2,df a. A 90% confidence level with n = 25. b. A 90% confidence level with n = 35. c. A 99%...
We draw a random sample of size 25 from a normal population with a known variance...
We draw a random sample of size 25 from a normal population with a known variance of 2.4. If the sample mean is 12.5, what is the Lower Confidence Limit for the 95% confidence interval for the population mean? Include 1 decimal place in your answer
3.97 and 52 Find a 90% confidence interval or the population variance σ2 ndom sample o...
3.97 and 52 Find a 90% confidence interval or the population variance σ2 ndom sample o n-13 observations was selected rom a normal Population. The sample mean and variance were x 176 x to 817 Round your answers to three decimal places 0.3214
A random sample of n=7 observations are drawn from a normal population with mean and variance...
A random sample of n=7 observations are drawn from a normal population with mean and variance σ^2. The mean and variance of the sample are 1.45 and 2.07 respectively. Calculate a 90% confidence interval for the population standard deviation.
QUESTION 10 1. It is known that the standard deviation of a population equals 30. A random sample of 85 observations is going to be taken from the population. Compute the margin of error corresponding to a 99% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 11 The average score of a sample of 50 senior business majors at UTC who took the Graduate Management Admission Test was 510 with...
A random sample of 49 observations is used to estimate the population variance. The sample mean and sample standard deviation are calculated as 59 and 3.1, respectively. Assume that the population is normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Construct the 90% interval estimate for the population variance. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence interval b. Construct the...
A random sample of 43 observations is used to estimate the population variance. The sample mean and sample standard deviation are calculated as 68.5 and 3.1, respectively. Assume that the population is normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Construct the 95% interval estimate for the population variance. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence interval to b. Construct...
In order to construct a confidence interval for the population variance, a random sample of n observations is drawn from a normal population. Use this information to find χ2a/2, df and χ21 L 2, df under the following scenarios. (Round your answers to 3 decimal places. You may find it useful to reference the appropriate table: chi-square table or Ftable) a/2,d.f X"1-a/2,df a. A 90% confidence level with n- 17. b. A 90% confidence level with n- 28. C. A...
3.97 and 52 Find a 90% confidence interval or the population variance σ2 ndom sample o n-13 observations was selected rom a normal Population. The sample mean and variance were x 176 x to 817 Round your answers to three decimal places 0.3214
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