Homework Answers
From the above information
33)The critical value of 92 % confidence interval of z
1.7507
34)true answers
a) the population mean may or may not be in the confidence interval
C) if the sample size is large central limit theoren says that interval will be valid
35)
C) sample proporion and population proportion only
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33. Find the z-score used in the formula to construct a 92% confidence interval for a...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A...
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A random sample of 36 scores is taken and gives a sample mean (sample mean score) of 68. EBM will be the largest O a when the population standard deviation is 12 points, when the population standard deviation is 18 points. OC when the population standard deviation is 15 points when the population standard deviation is 20 points Od b. Suppose we are interested to...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c)...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. Assume that x is normally distributed x= 27, n=9, 0 = 6 a. Find a 95% confidence interval for the population mean The 95% confidence interval is from to (Round to two decimal places as needed.) b. Identify and interpret the margin of error. The margin of error is (Round to two decimal places as needed.) Interpret the margin of error. Choose the...
1) 2) A (1-a) confidence interval procedure ensures that if a large number of confidence intervals...
1)
2)
A (1-a) confidence interval procedure ensures that if a large number of confidence intervals are computed, each based on n samples, then the proportion of the confidence intervals that contain the true value should be close to (1-a). True O False Suppose we are required to estimate the output from a simulation so that we are 95% confident that we are within plus or minus 1 of the true population mean. After taking a pilot sample of size...
? What does it mean if you use a sample of size 50 to construct a...
?
What does it mean if you use a sample of size 50 to construct a 95% Confidence interval for a population proportion? O A. If you construct 100 such intervals in the same manner, you would expect that 95 of the constructed intervals would contain the true population proportion. OB. The true population proportion is between 90% and 100%. OC. The true population proportion is less than 95% because the sample size is large enough to support this conclusion...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c)...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. x= 23, n= 36, 3 = 3 a. Find a 95% confidence interval for the population mean. The 95% confidence interval is from to (Round to two decimal places as needed.) b. Identify and interpret the margin of error. The margin of error is (Round to two decimal places as needed.) Interpret the margin of error. Choose the correct answer below. O A....
Find an estimate of the sample size needed to obtain a margin of error of 33...
Find an estimate of the sample size needed to obtain a margin of error of 33 for the 95% confidence interval of a population mean, given a sample standard deviation of 400. Do not round until the final answer O A 3 OB, 19,394 OC. 24 OD. 588
Given the confidence interval for a population mean, 55.4< < 58.6 , find the point estimate...
Given the confidence interval for a population mean, 55.4< < 58.6 , find the point estimate of . O A 1.6 OB. 57 OC. 2.8 OD. 114 E. not enough information is given to answer the question QUESTIONS We will use 800 simple random samples, each of size 30, from a given population to calculate a series of 92% confidence intervals to estimate . Approximately how many of the 800 intervals will contain the population mean? O A 700 OB....
Find the margin of error for a 95% confidence interval for estimating the population mean when...
Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 92, with a sample size of (a) 400,(b) 1800. What is the effect of the sample size? 2. The margin of error for a 95% confidence interval with a sample size of 400 is (Round to the nearest tenth as needed.) b. The margin of error for a 90% confidence interval with a sample size of 1600 is (Round...
Answers only is fine! Find the critical value zc necessary to form a confidence interval at...
Answers only is fine! Find the critical value zc necessary to form a confidence interval at the level of confidence shown below. c=0.92 Find the margin of error for the given values of c, σ, and n. c = 0.95, σ =2.4, n = 8.1 Level of Confidence. zc 90% 1.645 95% 1.96 99% 2.575 Construct the confidence interval for the population mean μ. c=0.98, x=9.5, σ=0.3, and n= 52 Construct the confidence interval for the population mean μ. c=0.95, x=16.7, σ=6.0, and n=...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A random sample of 36 scores is taken and gives a sample mean (sample mean score) of 68. EBM will be the largest O a when the population standard deviation is 12 points, when the population standard deviation is 18 points. OC when the population standard deviation is 15 points when the population standard deviation is 20 points Od b. Suppose we are interested to...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. Assume that x is normally distributed x= 27, n=9, 0 = 6 a. Find a 95% confidence interval for the population mean The 95% confidence interval is from to (Round to two decimal places as needed.) b. Identify and interpret the margin of error. The margin of error is (Round to two decimal places as needed.) Interpret the margin of error. Choose the...
1)
2)
A (1-a) confidence interval procedure ensures that if a large number of confidence intervals are computed, each based on n samples, then the proportion of the confidence intervals that contain the true value should be close to (1-a). True O False Suppose we are required to estimate the output from a simulation so that we are 95% confident that we are within plus or minus 1 of the true population mean. After taking a pilot sample of size...
?
What does it mean if you use a sample of size 50 to construct a 95% Confidence interval for a population proportion? O A. If you construct 100 such intervals in the same manner, you would expect that 95 of the constructed intervals would contain the true population proportion. OB. The true population proportion is between 90% and 100%. OC. The true population proportion is less than 95% because the sample size is large enough to support this conclusion...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. x= 23, n= 36, 3 = 3 a. Find a 95% confidence interval for the population mean. The 95% confidence interval is from to (Round to two decimal places as needed.) b. Identify and interpret the margin of error. The margin of error is (Round to two decimal places as needed.) Interpret the margin of error. Choose the correct answer below. O A....
Find an estimate of the sample size needed to obtain a margin of error of 33 for the 95% confidence interval of a population mean, given a sample standard deviation of 400. Do not round until the final answer O A 3 OB, 19,394 OC. 24 OD. 588
Given the confidence interval for a population mean, 55.4< < 58.6 , find the point estimate of . O A 1.6 OB. 57 OC. 2.8 OD. 114 E. not enough information is given to answer the question QUESTIONS We will use 800 simple random samples, each of size 30, from a given population to calculate a series of 92% confidence intervals to estimate . Approximately how many of the 800 intervals will contain the population mean? O A 700 OB....
Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 92, with a sample size of (a) 400,(b) 1800. What is the effect of the sample size? 2. The margin of error for a 95% confidence interval with a sample size of 400 is (Round to the nearest tenth as needed.) b. The margin of error for a 90% confidence interval with a sample size of 1600 is (Round...
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