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Section 11.7 Exercise 20 Question Help A random sample of the amounts for 20 purchases was...
Section 11.7 Exercise 19 Question Help A survey was conducted of the age (in years) of...
Section 11.7 Exercise 19 Question Help A survey was conducted of the age (in years) of 30 randomly selected customers. The mean was 29.83 years and the standard deviation was 11.56 years. a) How large would the sample size have to be to cut the margin of error in half? b) About how large would the sample size have to be to cut the margin of error by a factor of 20? a) The new sample size should be (Round...
Question Help 0 Arandom sample of 20 purchases showed the amounts in the table in $)....
Question Help 0 Arandom sample of 20 purchases showed the amounts in the table in $). The mean is $47.86 and the standard deviation is $19.25. a) Construct a 80% confidence interval for the mean purchases of all customers, assuming that the assumptions and conditions for the confidence interval have been met. b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the standard deviation was known to be $20?...
A simple random sample of size nis drawn from a population that is normally distributed. The...
A simple random sample of size nis drawn from a population that is normally distributed. The sample mean, X, is found to be 106, and the sample standard deviations, is found to be 9. (a) Construct a 95% confidence interval about if the sample size, n, is 26 (b) Construct a 95% confidence interval about if the sample size, n, is 13 (c) Construct a 90% confidence interval about if the sample size, n, is 26 (d) Should the confidence...
100 random samples were taken, and for each random sample we made a 95% confidence interval,...
100 random samples were taken, and for each random sample we made a 95% confidence interval, about how many of those 100 confidence intervals would actually contain the parameter? Increasing the confidence level (more than one) a increase the width of a confidence interval b increase the probability that the parameter is in the confidence interval c increase the percentage of samples which will create a confidence interval that contains the parameter d Increase the margin of error A...
A simple random sample of size n is drawn. The sample mean,x overbarx, is found to...
A simple random sample of size n is drawn. The sample mean,x overbarx, is found to be 17.8 and the sample standard deviation, s, is found to be 4.4 (a) Construct a 95% confidence interval about μ if the sample size, n, is 35 Lower bound: ____ Upper bound: ______ (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about μ if the sample size, n, is 51 Lower bound: ____ Upper bound:...
o be 4.5. A simple random sample of size n is drawn. The sample mean, X,...
o be 4.5. A simple random sample of size n is drawn. The sample mean, X, is found to be 17.9, and the sample standard deviation, s, is found Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about H if the sample size, n, is 35. Lower bound: Upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about if the sample...
A simple random sample of size n is drawn. The sample mean, , is found to...
A simple random sample of size n is drawn. The sample mean, , is found to be 19.2, and the sample standard deviation, s, is found to be 4.6. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about u if the sample size, n, is 35. Lower bound: I; Upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if...
Please solve: Question 3 of 16 (15 points) I Attempt 1 of 1 View question in...
Please solve:
Question 3 of 16 (15 points) I Attempt 1 of 1 View question in a popup | 卤 2h 28m Remaining 7.1 Section Exercise 39-40 A population has standard deviation 17.4. alo Part 1 of 2 (a) How large a sample must be drawn so that a 95% confidence interval for μ will have a margin of error equal to 4.2? Round the answer up to the nearest integer. (Round the critical value to no less than three...
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 113, and the sample standard deviation, s, is found to be 10 (a) Construct a 95% confidence interval about if the sample size, n, is 25. (b) Construct a 95% confidence interval about if the sample size, n, is 13 (c) Construct a 90% confidence interval about if the sample size, n, is 25. (d) Could...
A simple random sample of size n is drawn. The sample mean, x, is found to...
A simple random sample of size n is drawn. The sample mean, x, is found to be 19.2, and the sample standard deviation, s, is found to be 4.9. Click the icon to view the table of areas under the t-distribution (a) Construct a 95% confidence interval about ju if the sample size, n, is 34. Lower bound: upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if the...
Section 11.7 Exercise 19 Question Help A survey was conducted of the age (in years) of 30 randomly selected customers. The mean was 29.83 years and the standard deviation was 11.56 years. a) How large would the sample size have to be to cut the margin of error in half? b) About how large would the sample size have to be to cut the margin of error by a factor of 20? a) The new sample size should be (Round...
Question Help 0 Arandom sample of 20 purchases showed the amounts in the table in $). The mean is $47.86 and the standard deviation is $19.25. a) Construct a 80% confidence interval for the mean purchases of all customers, assuming that the assumptions and conditions for the confidence interval have been met. b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the standard deviation was known to be $20?...
A simple random sample of size nis drawn from a population that is normally distributed. The sample mean, X, is found to be 106, and the sample standard deviations, is found to be 9. (a) Construct a 95% confidence interval about if the sample size, n, is 26 (b) Construct a 95% confidence interval about if the sample size, n, is 13 (c) Construct a 90% confidence interval about if the sample size, n, is 26 (d) Should the confidence...
o be 4.5. A simple random sample of size n is drawn. The sample mean, X, is found to be 17.9, and the sample standard deviation, s, is found Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about H if the sample size, n, is 35. Lower bound: Upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about if the sample...
A simple random sample of size n is drawn. The sample mean, , is found to be 19.2, and the sample standard deviation, s, is found to be 4.6. Click the icon to view the table of areas under the t-distribution. (a) Construct a 95% confidence interval about u if the sample size, n, is 35. Lower bound: I; Upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if...
Please solve:
Question 3 of 16 (15 points) I Attempt 1 of 1 View question in a popup | 卤 2h 28m Remaining 7.1 Section Exercise 39-40 A population has standard deviation 17.4. alo Part 1 of 2 (a) How large a sample must be drawn so that a 95% confidence interval for μ will have a margin of error equal to 4.2? Round the answer up to the nearest integer. (Round the critical value to no less than three...
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 113, and the sample standard deviation, s, is found to be 10 (a) Construct a 95% confidence interval about if the sample size, n, is 25. (b) Construct a 95% confidence interval about if the sample size, n, is 13 (c) Construct a 90% confidence interval about if the sample size, n, is 25. (d) Could...
A simple random sample of size n is drawn. The sample mean, x, is found to be 19.2, and the sample standard deviation, s, is found to be 4.9. Click the icon to view the table of areas under the t-distribution (a) Construct a 95% confidence interval about ju if the sample size, n, is 34. Lower bound: upper bound: (Use ascending order. Round to two decimal places as needed.) (b) Construct a 95% confidence interval about u if the...
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