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QUESTION 10 1. It is known that the standard deviation of a population equals 30. A...
QUESTION 9 It is known that the variance of a population equals 1444. A random sample...
QUESTION 9 It is known that the variance of a population equals 1444. A random sample of 100 observations is going to be taken from the population. Compute the margin of error corresponding to a 96% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 12 The average score of a sample of 100 senior business majors at UTC who took the Graduate Management Admission Test was 530 with a variance...
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?
Consider a population with a known standard deviation of 18.6. In order to compute an interval estimate for the populat...
Consider a population with a known standard deviation of 18.6. In order to compute an interval estimate for the population mean, a sample of 58 observations is drawn. [You may find it useful to reference the z table. a. Is the condition that X is normally distributed satisfied? Yes No b. Compute the margin of error at a 99% confidence level. (Round intermediate calculations to at least 4 decimal places. Round "z" value to 3 decimal places and final answer...
Consider a normal population with an unknown population standard deviation. A random sample results in x...
Consider a normal population with an unknown population standard deviation. A random sample results in x = 40.62 and s2 - 21.16. [You may find it useful to reference the t table.] a. Compute the 99% confidence interval for u if x and s2 were obtained from a sample of 8 observations. (Round intermediate calculations to at least 4 decimal places. Round "to" value to 3 decimal places and final answers to 2 decimal places.) Confidence intervalſ to b. Compute...
A statistics practitioner took a random sample of 54 observations from a population whose standard deviation...
A statistics practitioner took a random sample of 54 observations from a population whose standard deviation is 33 and computed the sample mean to be 105. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 90% confidence. Confidence interval = C. Estimate the population mean with 99%...
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55.
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55. Determine the 99% confidence interval for the population mean. (Round your answers to 2 decimal places.) Confidence interval for the population mean is _______ and _______ .A research firm conducted a survey to determine the mean amount Americans spend on coffee during a week. They found the distribution of weekly spending followed the normal distribution with a population standard deviation...
. A population has a known standard deviation of 1.27, and the sample space contains 85...
. A population has a known standard deviation of 1.27, and the sample space contains 85 values. Find the margin of error needed to create a 99% confidence interval estimate of the mean of the population.
3 Suppose that a population is being studied that has a known standard deviation of 110....
3 Suppose that a population is being studied that has a known standard deviation of 110. Further suppose a sample of size 90 is taken, resulting in a sample mean of 550. Determine the Point Estimate and the Margin of Error for a 95% Confidence Interval for this sample. Round all calculations to two (2) decimal places. 6 Blank # 1 550 A/ Blank # 2 Question 2 (4 points) Saved Suppose that a population is being studied that has...
Consider a normal population with an unknown population standard deviation. A random sample results in x...
Consider a normal population with an unknown population standard deviation. A random sample results in x = 42.55 and 52 = 28.09. [You may find it useful to reference the t table.] a. Compute the 99% confidence interval for u if x and s2 were obtained from a sample of 24 observations. (Round intermediate calculations to at least 4 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval b. Compute the...
#25 A simple random sample of size n equals 40 is drawn from a population. The...
#25 A simple random sample of size n equals 40 is drawn from a population. The sample mean is found to be x overbar equals 121.3 and the sample standard deviation is found to be s equals 12.2. Construct a 99% confidence interval for the population mean. The lower bound is nothing. (Round to two decimal places as needed.) The upper bound is nothing. (Round to two decimal places as needed.)
QUESTION 9 It is known that the variance of a population equals 1444. A random sample of 100 observations is going to be taken from the population. Compute the margin of error corresponding to a 96% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 12 The average score of a sample of 100 senior business majors at UTC who took the Graduate Management Admission Test was 530 with a variance...
Consider a population with a known standard deviation of 18.6. In order to compute an interval estimate for the population mean, a sample of 58 observations is drawn. [You may find it useful to reference the z table. a. Is the condition that X is normally distributed satisfied? Yes No b. Compute the margin of error at a 99% confidence level. (Round intermediate calculations to at least 4 decimal places. Round "z" value to 3 decimal places and final answer...
Consider a normal population with an unknown population standard deviation. A random sample results in x = 40.62 and s2 - 21.16. [You may find it useful to reference the t table.] a. Compute the 99% confidence interval for u if x and s2 were obtained from a sample of 8 observations. (Round intermediate calculations to at least 4 decimal places. Round "to" value to 3 decimal places and final answers to 2 decimal places.) Confidence intervalſ to b. Compute...
A statistics practitioner took a random sample of 54 observations from a population whose standard deviation is 33 and computed the sample mean to be 105. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 90% confidence. Confidence interval = C. Estimate the population mean with 99%...
3 Suppose that a population is being studied that has a known standard deviation of 110. Further suppose a sample of size 90 is taken, resulting in a sample mean of 550. Determine the Point Estimate and the Margin of Error for a 95% Confidence Interval for this sample. Round all calculations to two (2) decimal places. 6 Blank # 1 550 A/ Blank # 2 Question 2 (4 points) Saved Suppose that a population is being studied that has...
Consider a normal population with an unknown population standard deviation. A random sample results in x = 42.55 and 52 = 28.09. [You may find it useful to reference the t table.] a. Compute the 99% confidence interval for u if x and s2 were obtained from a sample of 24 observations. (Round intermediate calculations to at least 4 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval b. Compute the...
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