2. When calculating confidence interval, if you want a wider interval do you: which of the...
2. When calculating confidence interval, if you want a wider interval do you: which of the option is correct
a) Increase the confidence level.
b) Decrease the confidence level
. c) Increase the sample size.
d) Decrease the sample size.
Homework Answers
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2. When calculating confidence interval, if you want a wider
interval do you: which of the...
If you decide you want a smaller margin of error for a confidence interval, should you...
If you decide you want a smaller margin of error for a confidence interval, should you increase or decrease the sample size? A) Increase B) Decrease C) Do not need to change
confidence interval is wider A confidence interval is wider if a. A larger sample (n) is...
confidence interval is wider
A confidence interval is wider if a. A larger sample (n) is used b.A larger t or z value is used. C. It is changed from a 95% Cl to a 90% CI d. Both (b) and (c) e. All of the above
Suppose you construct a 96% confidence interval for a population mean from a normal distribution with...
Suppose you construct a 96% confidence interval for a population
mean from a normal distribution with known
.
Scenario 1: If you increase the size of the sample while keeping
the same 95% level of confidence, how would your confidence
interval be affected? Circle answer.
a. would be wider
b. would be narrower
c. there would be no change
d. no way to know without additional information
Scenario 2: If you increase the level of confidence from 96% to
99%...
QUESTION 12 "If you wish to decrease the width of a confidence interval, you may do...
QUESTION 12 "If you wish to decrease the width of a confidence interval, you may do which one of the following: " Reduce sample size. Reduce the size of the population. Decrease the level of confidence. Both b and c
19. When calculating a confidence interval, keeping the sample size the same but decreasing the confidence level, will a. decrease the width of the confidence interval b. decrease the margin of error...
19. When calculating a confidence interval, keeping the sample size the same but decreasing the confidence level, will a. decrease the width of the confidence interval b. decrease the margin of error c. make us less sure that our confidence interval contains the true parameter d. all of the above 20. A research company polled a random sample of 799 U.S. teens about internet use.0.49 of those teens reported that they had misrepresented their age online to gain access to...
QUESTION 24 Answer the following 2 questions using the information below. Researchers want to know if...
QUESTION 24 Answer the following 2 questions using the information below. Researchers want to know if students working part-time jobs are working too much, therefore, spending less time on their classes than they should be. First, the researchers need to find out how many hours a week students are working on average. From previous studies, the standard deviation of this variable is about 3.2 hours. They know from previous studies that the standard deviation of this variable is about 5...
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...
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?
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....
Recall that the formula for a confidence interval is Statistc + MOE. Next you will need...
Recall that the formula for a confidence interval is Statistc + MOE. Next you will need to interpret the confidence interval. The interpretation of a confidence interval should always include 3 things: the level of confidence, reference to the parameter in context and the calculated interval. Notice that the only difference between this worksheet and the calculating confidence intervals worksheet from module 8 is that you now need to calculate the margin of error. 1. Suppose that a recent study...
confidence interval is wider
A confidence interval is wider if a. A larger sample (n) is used b.A larger t or z value is used. C. It is changed from a 95% Cl to a 90% CI d. Both (b) and (c) e. All of the above
Suppose you construct a 96% confidence interval for a population
mean from a normal distribution with known
.
Scenario 1: If you increase the size of the sample while keeping
the same 95% level of confidence, how would your confidence
interval be affected? Circle answer.
a. would be wider
b. would be narrower
c. there would be no change
d. no way to know without additional information
Scenario 2: If you increase the level of confidence from 96% to
99%...
19. When calculating a confidence interval, keeping the sample size the same but decreasing the confidence level, will a. decrease the width of the confidence interval b. decrease the margin of error c. make us less sure that our confidence interval contains the true parameter d. all of the above 20. A research company polled a random sample of 799 U.S. teens about internet use.0.49 of those teens reported that they had misrepresented their age online to gain access to...
QUESTION 24 Answer the following 2 questions using the information below. Researchers want to know if students working part-time jobs are working too much, therefore, spending less time on their classes than they should be. First, the researchers need to find out how many hours a week students are working on average. From previous studies, the standard deviation of this variable is about 3.2 hours. They know from previous studies that the standard deviation of this variable is about 5...
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...
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....
Recall that the formula for a confidence interval is Statistc + MOE. Next you will need to interpret the confidence interval. The interpretation of a confidence interval should always include 3 things: the level of confidence, reference to the parameter in context and the calculated interval. Notice that the only difference between this worksheet and the calculating confidence intervals worksheet from module 8 is that you now need to calculate the margin of error. 1. Suppose that a recent study...
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