Homework Answers
If a larger t or z value is used then margin of error will increase which in turn will increase the confidence interval.
Option B is correct.
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confidence interval is wider
A confidence interval is wider if a. A larger sample (n) is...
Does a confidence interval get wider or narrower if: (a) the percent of desired confidence decreases...
Does a confidence interval get wider or narrower if: (a) the percent of desired confidence decreases from 95% to 90%? (b) the size of the sample used to produce the confidence interval is decreased?
Question 5: Which statement is true: (a) A 90% confidence interval for μ is wider than...
Question 5: Which statement is true: (a) A 90% confidence interval for μ is wider than a 95% confidence interval for μ (b) The width (Le, the length) of a confidence interval is equal to its margin of error (c) Decreasing the sample size will make the confidence wider (d) The standard deviation of the sample mean is larger than the population standard deviation o. Question 6. A test of H0 : μ-128 against Ha : μ > 12.8 has...
(05.01 LC) A polling company has decided to increase the size of its random sample of...
(05.01 LC) A polling company has decided to increase the size of its random sample of voters from about 2,000 people to about 4,500 people right before an election. A poll was designed to estimate the proportion of voters who favor a new law to set an 11 p.m. curfew for teenagers. What is the effect of this increase? (4 points) a To reduce the bias of the estimate b To increase the bias of the estimate c To reduce...
Using Excel, find the value of the 95% confidence interval for a single sample using both...
Using Excel, find the value of the 95% confidence interval for a single sample using both the z variable and the student's t-distribution where the mean is 10.00 with a standard deviation of 0.50. When calculating the confidence interval for the z-value, assume any value of n is a large sample, and when calculating the confidence interval for the for the student's t-distribution, assume any value of n is a small sample. Compute the confidence intervals for: a. n 50...
Which of the following would produce a confidence interval with a larger margin of error than...
Which of the following would produce a confidence interval with a larger margin of error than the 95% confidence interval with a sample size of 50? A. using a sample size of 100 and fix the confidence level. B. using a confidence level of 90% and fix the sample size. C. using a confidence level of 99% and fix the sample size. D. using a sample size of 500 and fix the confidence level. E. None of the above.
c. Draw a graph to display both confidence intervals. smaller O A larger B. 96% CI...
c. Draw a graph to display both confidence intervals. smaller O A larger B. 96% CI for 99% CI for 99% CI for 95% CI for 7.5 5.5 O c. Q OD. 96% CI for 95% CI for 99% CI for 99% CI for 7.5 5.5 d. Which confidence interval yields a more accurate estimate of u? Explain your answer. The 95% confidence interval is a more accurate estimate, because it is narrower than the 99% confidence interval. A random...
Based on a random sample of 120 rhesus monkeys, a 95% confidence interval for the proportion...
Based on a random sample of 120 rhesus monkeys, a 95% confidence interval for the proportion of rhesus monkeys that live in a captive breeding facility and were assigned to research studies is (0.67, 0.83). Which of the following is true? A. If we used a different confidence level, the point estimate would remain in the center of the confidence interval. B. A larger sample size would yield a wider confidence interval. C. The margin of error for the confidence...
15. Use the given sample data: construct a 95% confidence interval for the population mean: n...
15. Use the given sample data: construct a 95% confidence interval for the population mean: n = 13, xbar = 14.2, A) (11.91, 16.49) B) (12.87, 15.54) C) (12.57, 15.83) D) (13.03, 15.37) E) None of the Above 16. The principal randomly selected 6 students to take an aptitude test. Their scores were: 91.5, 80.5, 74.0, 76.7, 76 and 77.1 Determine a 90% confidence interval for the mean score for all students. A) (74.23, 84.57) B) (65.90, 89.57) C) (70.19,...
two random samples from the same population have sample sizes of n=35 and n=50. Which of...
two random samples from the same population have sample sizes of n=35 and n=50. Which of the following is true for a 95% confidence interval. A. confidence interval for the sample size n=50 is narrower b. confidence interval for the sample size n=50 is wider c. sample size of n=35 has a greater degree of confidence d. sample size n=50 has a greater degree of confidence e. all of the above
Concept 4. Consider the following statement about a 95% confidence interval (CI) for the parameter p and enter the correct answer for the blank. If the sample size were increased to n 1000 then t...
Concept 4. Consider the following statement about a 95% confidence interval (CI) for the parameter p and enter the correct answer for the blank. If the sample size were increased to n 1000 then the confidence interval would be the confidence interval computed from a sample with n 64. A. Narrower than B. Wider than C. The same size as Concept 5. Consider the following statements for 10 non-negative numbers with mean 100. Select the letter(s) of each statement that...
Question 5: Which statement is true: (a) A 90% confidence interval for μ is wider than a 95% confidence interval for μ (b) The width (Le, the length) of a confidence interval is equal to its margin of error (c) Decreasing the sample size will make the confidence wider (d) The standard deviation of the sample mean is larger than the population standard deviation o. Question 6. A test of H0 : μ-128 against Ha : μ > 12.8 has...
Using Excel, find the value of the 95% confidence interval for a single sample using both the z variable and the student's t-distribution where the mean is 10.00 with a standard deviation of 0.50. When calculating the confidence interval for the z-value, assume any value of n is a large sample, and when calculating the confidence interval for the for the student's t-distribution, assume any value of n is a small sample. Compute the confidence intervals for: a. n 50...
c. Draw a graph to display both confidence intervals. smaller O A larger B. 96% CI for 99% CI for 99% CI for 95% CI for 7.5 5.5 O c. Q OD. 96% CI for 95% CI for 99% CI for 99% CI for 7.5 5.5 d. Which confidence interval yields a more accurate estimate of u? Explain your answer. The 95% confidence interval is a more accurate estimate, because it is narrower than the 99% confidence interval. A random...
15. Use the given sample data: construct a 95% confidence interval for the population mean: n = 13, xbar = 14.2, A) (11.91, 16.49) B) (12.87, 15.54) C) (12.57, 15.83) D) (13.03, 15.37) E) None of the Above 16. The principal randomly selected 6 students to take an aptitude test. Their scores were: 91.5, 80.5, 74.0, 76.7, 76 and 77.1 Determine a 90% confidence interval for the mean score for all students. A) (74.23, 84.57) B) (65.90, 89.57) C) (70.19,...
Concept 4. Consider the following statement about a 95% confidence interval (CI) for the parameter p and enter the correct answer for the blank. If the sample size were increased to n 1000 then the confidence interval would be the confidence interval computed from a sample with n 64. A. Narrower than B. Wider than C. The same size as Concept 5. Consider the following statements for 10 non-negative numbers with mean 100. Select the letter(s) of each statement that...
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