Homework Answers
Confidence itnervals (43.25, 46.75)
To calculate the sample mean: 
To calculate error bound: 
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The typing speeds for secretaries are normally distributed. If a random sample of secretaries is taken...
The cost per week on office repairs is normally distributed. If a random sample of repair...
The cost per week on office repairs is normally distributed. If a random sample of repair bills is taken and the confidence interval is (95.25, 98.75), what is the error bound?
Suppose a random sample of size 17 was taken from a normally distributed population, and the...
Suppose a random sample of size 17 was taken from a normally distributed population, and the sample standard deviation was calculated to be s = 5.0. a) Calculate the margin of error for a 95% confidence interval for the population mean. Round your response to at least 3 decimal places. b) Calculate the margin of error for a 90% confidence interval for the population mean. Round your response to at least 3 decimal places.
The population standard deviation for the typing speeds for secretaries is 4 words per minute. If...
The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table above for the z-score, and be sure to round up to the nearest integer.
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...
simple random sample of size n is drawn from a population that is normally distributed. The...
simple random sample of size n is drawn from a population that is normally distributed. The sample mean, X. is found to be 111, and the sample standard deviation is found to be 10. a) Construct a 95% confidence interval about if the sample size, n, is 28. b) Construct a 95% confidence interval about if the sample size, n, is 11 c) Construct a 90% confidence interval about if the sample size, n, is 28 ) Could we have...
is found to be 10 A simple random sample of size nis drawn from a population that is normally distributed. The sam...
is found to be 10 A simple random sample of size nis drawn from a population that is normally distributed. The sample mean is found to be 112, and the sample standard deviation (a) Construct a 90% confidence interval about the sample sen, 29. (b) Construct a 96confidence interval about if the sample size is 11 (c) Construct a 70% condence interval about the sample sen, 29. (d) Could we have computed the confidence intervals in parts (He) if the...
random sample of 16 observations was taken from a normally distributed population. The average in the...
random sample of 16 observations was taken from a normally distributed population. The average in the sample was 80 with a variance of 144. a Construct a 90% confidence interval for 1. b. Construct a 99% confidence interval for . c. Discuss why the 90% and 99% confidence intervals are different. What would you expect to happen to the confidence interval in part a if the sample size was increased? Be sure to explain your answer d.
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 110, and the sample standard deviation, s, is found to be 10 (a) Construct an 80% confidence interval about p if the sample size, n, is 14 (b) Construct an 80% confidence interval about if the sample size, n, is 18. (c) Construct a 98% confidence interval about if the sample size, n, is 14. (d)...
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 random sample of n=12 values taken from a normally distributed population resulted in the sample...
A random sample of n=12 values taken from a normally distributed population resulted in the sample values below. Use the sample information to construct a 98% confidence interval estimate for the population mean. 112 111 90 109 111 102 115 100 108 102 108 110 The 98% confidence interval is from $ to $?
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...
simple random sample of size n is drawn from a population that is normally distributed. The sample mean, X. is found to be 111, and the sample standard deviation is found to be 10. a) Construct a 95% confidence interval about if the sample size, n, is 28. b) Construct a 95% confidence interval about if the sample size, n, is 11 c) Construct a 90% confidence interval about if the sample size, n, is 28 ) Could we have...
is found to be 10 A simple random sample of size nis drawn from a population that is normally distributed. The sample mean is found to be 112, and the sample standard deviation (a) Construct a 90% confidence interval about the sample sen, 29. (b) Construct a 96confidence interval about if the sample size is 11 (c) Construct a 70% condence interval about the sample sen, 29. (d) Could we have computed the confidence intervals in parts (He) if the...
random sample of 16 observations was taken from a normally distributed population. The average in the sample was 80 with a variance of 144. a Construct a 90% confidence interval for 1. b. Construct a 99% confidence interval for . c. Discuss why the 90% and 99% confidence intervals are different. What would you expect to happen to the confidence interval in part a if the sample size was increased? Be sure to explain your answer d.
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, X, is found to be 110, and the sample standard deviation, s, is found to be 10 (a) Construct an 80% confidence interval about p if the sample size, n, is 14 (b) Construct an 80% confidence interval about if the sample size, n, is 18. (c) Construct a 98% confidence interval about if the sample size, n, is 14. (d)...
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...
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