Which of the following does NOT correctly describe how the width of a confidence interval for...
Which of the following does NOT correctly describe how the width of a confidence interval for a population mean changes when the population standard deviation is known?
The interval changes if the sample size decreases.
The interval changes if the sample size increases.
The interval narrows if the sample size increases and confidence level stays the same.
The interval widens if the sample size decreases and the confidence level stays the same.
The interval widens if the sample size stays the same and confidence level decreases.
Homework Answers
Margin of error = Z * sd / sqrt(n)
Option-E) The interval widens if the sample size stays the same and confidence level decreases.
Because if confidence level decreases, margin of error will also decrease. So width will also decrease.
Add Answer to:
Which of the following does NOT correctly describe how the width
of a confidence interval for...
Which of the following correctly describes how the width of a confidence interval for a population...
Which of the following correctly describes how the width of a confidence interval for a population mean changes when the population standard deviation is known? There is no change if just the sample size increases. The interval widens if the sample size stays the same and confidence level decreases. The interval narrows if the sample size increases and confidence level stays the same. The interval narrows if the sample size decreases and confidence level stays the same. The interval widens...
Please give explanation................................................. Multiple Choice. Select the best response 1. An estimator is said to be...
Please give
explanation.................................................
Multiple Choice. Select the best response 1. An estimator is said to be consistent if a. the difference between the estimator and the population parameter grows smaller as the sample b. C. d. size grows larger it is an unbiased estimator the variance of the estimator is zero. the difference between the estimator and the population parameter stays the same as the sample size grows larger 2. An unbiased estimator of a population parameter is defined as...
QUESTION 3 All things being equal, which is correct? As the confidence level increases, the margin...
QUESTION 3 All things being equal, which is correct? As the confidence level increases, the margin of error gets larger. As the sample size increases, the confidence interval gets wider. As the standard deviation increases, the margin of error gets smaller. As the sample mean increases, the margin of error gets larger. Which of the following is correct? As the sample size increases, the confidence level decreases. As the confidence level increases, the width of the confidence interval decreases. As...
Please show the process 6. In developing an interval estimate for a population mean, the population...
Please show the process
6. In developing an interval estimate for a population mean, the population standard deviation σ was assumed to be 10. The interval estimate was 50.92 2.14. Had ơ equaled 20, the interval estimate would be a. 60.92 t 2.14 b. 50.92 12.14 c. 101.84 4.28 d. 50.92t 4.28 7. If the confidence level is reduced, the confidence interval a. widens. b. remains the same. C. narrows. d. disappears. 8. The zal value for a 95% confidence...
Consider the usual confidence interval for the mean of a normal population with known variance. What...
Consider the usual confidence interval for the mean of a normal population with known variance. What is the relationship between confidence and precision as measured by interval width? A. For a fixed sample size, decreasing the confidence level has no effect on the precision B. For a fixed sample size, decreasing the confidence level decreases the precision C. For a fixed sample size, decreasing the confidence level increases the precision D. None of the above
1. What effect does raising the level of confidence have on the width of the confidence...
1. What effect does raising the level of confidence have on the width of the confidence interval? 2. What effect does lowering the the sample size have on the width of the confidence interval? 3. What effect does a smaller population standard deviation have on the width of the confidence interval? 4. Which of the following is the best interpretation for a 99% confidence interval? 5. Based on prior studies, you believe the standard deviation of IQ is normally distributed...
If you are constructing a confidence interval for a population mean, for the same confidence level,...
If you are constructing a confidence interval for a population mean, for the same confidence level, the width of the confidence interval will __________ as the sample size increases. Decrease Increase Stay the same Depends on the sample size
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean,...
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean, based on the following sample size of n-6. 1, 2, 3, 4, 5, and 19 Change the number 19 to 6 and recalculate the confidence interval. Using these results, describe the effect of an outlier (that is, an extreme value) on the confidence interval. Find a 90% confidence interval for the population mean, using the formula or calculator. [ ] SHS (Round to two...
QUESTION 6 Assume the population standard deviation o is known and the confidence level 1-a is...
QUESTION 6 Assume the population standard deviation o is known and the confidence level 1-a is fixed. As the sample size increases, the margin of error a. increases b. decreases OC. stays the same d. None of the other answers are correct
Consider a z confidence interval for the population mean. If the confidence level decreases but everything...
Consider a z confidence interval for the population mean. If the confidence level decreases but everything else stays the same then we can expect the size of the interval to: A test was conducted to determine if HO: Mu = 52.7 should be rejected in favor of Ha: Mu > 52.7 where mu refers to the population mean. A sample was selected and the resulting test statistic was found to be 2.15. What is the p-value for the sample statistic?...
Please give
explanation.................................................
Multiple Choice. Select the best response 1. An estimator is said to be consistent if a. the difference between the estimator and the population parameter grows smaller as the sample b. C. d. size grows larger it is an unbiased estimator the variance of the estimator is zero. the difference between the estimator and the population parameter stays the same as the sample size grows larger 2. An unbiased estimator of a population parameter is defined as...
QUESTION 3 All things being equal, which is correct? As the confidence level increases, the margin of error gets larger. As the sample size increases, the confidence interval gets wider. As the standard deviation increases, the margin of error gets smaller. As the sample mean increases, the margin of error gets larger. Which of the following is correct? As the sample size increases, the confidence level decreases. As the confidence level increases, the width of the confidence interval decreases. As...
Please show the process
6. In developing an interval estimate for a population mean, the population standard deviation σ was assumed to be 10. The interval estimate was 50.92 2.14. Had ơ equaled 20, the interval estimate would be a. 60.92 t 2.14 b. 50.92 12.14 c. 101.84 4.28 d. 50.92t 4.28 7. If the confidence level is reduced, the confidence interval a. widens. b. remains the same. C. narrows. d. disappears. 8. The zal value for a 95% confidence...
1. What effect does raising the level of confidence have on the width of the confidence interval? 2. What effect does lowering the the sample size have on the width of the confidence interval? 3. What effect does a smaller population standard deviation have on the width of the confidence interval? 4. Which of the following is the best interpretation for a 99% confidence interval? 5. Based on prior studies, you believe the standard deviation of IQ is normally distributed...
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean, based on the following sample size of n-6. 1, 2, 3, 4, 5, and 19 Change the number 19 to 6 and recalculate the confidence interval. Using these results, describe the effect of an outlier (that is, an extreme value) on the confidence interval. Find a 90% confidence interval for the population mean, using the formula or calculator. [ ] SHS (Round to two...
QUESTION 6 Assume the population standard deviation o is known and the confidence level 1-a is fixed. As the sample size increases, the margin of error a. increases b. decreases OC. stays the same d. None of the other answers are correct
Consider a z confidence interval for the population mean. If the confidence level decreases but everything else stays the same then we can expect the size of the interval to: A test was conducted to determine if HO: Mu = 52.7 should be rejected in favor of Ha: Mu > 52.7 where mu refers to the population mean. A sample was selected and the resulting test statistic was found to be 2.15. What is the p-value for the sample statistic?...
Most questions answered within 3 hours.
-
A statistics student finds herself struggling with a newspaper
article stating that only eighteen percent of...
asked 18 minutes ago -
People with beriberi, a disease caused by a thiamin deficiency,
have elevated levels of blood pyruvate...
asked 4 minutes ago -
PYTHON Programming Exercise 2: Create a Simple Cost Calculator
Write a program that displays input fields...
asked 10 minutes ago -
1.Seki agreed that Groupon could sell 18 hot air
balloon rides on his Magical Adventures company...
asked 11 minutes ago -
A cohort study is conducted to determine whether smoking is
associated with an increased risk of...
asked 17 minutes ago -
Create the pseudo-code/flowchart for an application class named
Monogram. Its main() method inputs three variables that...
asked 17 minutes ago -
How many liters of water are required to dissolve 1.00 g of
silver chromate? Express your...
asked 20 minutes ago -
Hot: T_inlet = 80, T_out = 65
Cold: T_inlet = 10, T_out = 25
Explain in...
asked 21 minutes ago -
Two protons fly in different directions and collide. They both
have a total energy of 1.5...
asked 30 minutes ago -
What is the oxidation number of each atom in sodium phosphate,
Na3PO4?
>>> SHOW YOUR WORK...
asked 36 minutes ago -
D company purchased goods with a list price of $60000, subject
to trade discounts of 20%...
asked 38 minutes ago -
Transposable elements make up more than 40% of the human genome
and are inserted more-or-less randomly...
asked 49 minutes ago