Course: BSMT-3250-10 Business Statistics Chapter 8 Question 1 Suppose you construct a confidence interval for the...
Course: BSMT-3250-10 Business Statistics
Chapter 8
Question 1
Suppose you construct a confidence interval for the difference between two population proportions. All other things equal, the confidence interval will necessarily be wider
|
A. |
the sample sizes are larger |
|
B. |
the confidence level is larger |
|
C. |
the difference between the sample proportions is larger |
|
D. |
the sample proportions are known |
Homework Answers
A narrow confidence interval implies that there is a smaller chance of obtaining an observation within that interval,
therefore, our accuracy is higher.
A 95% confidence interval is narrower than a 99% confidence interval which is wider.
The confidence interval will necessarily be wider when the confidence level is larger.
So Answer is B) the confidence level is larger.
Add Answer to:
Course: BSMT-3250-10 Business Statistics
Chapter 8
Question 1
Suppose you construct a confidence interval for the...
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%...
11. Construct the indicated confidence interval for the difference between population proportions. Assume that the samples...
11. Construct the indicated confidence interval for the
difference between population proportions. Assume
that the samples are independent and that they have been randomly
selected.
A marketing survey involves product recognition in New York and
California. Of 558 New Yorkers surveyed, 193 knew the product while
196 out of 614 Californians knew the product. Construct a 99%
confidence interval for the difference between the two population
proportions.
12. Construct the indicated confidence interval for the
difference between population proportions. Assume...
construct a confidence interval: Construct a confidence interval for Pi-P2 at the given level of confidence...
construct a confidence interval:
Construct a confidence interval for Pi-P2 at the given level of confidence x = 27.-253. x2 40,12 - 321, 95% confidence The researchers are confident the difference between the two population proportions. Pr - P2, is between and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed)
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....
11.1.15 Question Help Construct a confidence interval for P1-P2 at the given level of confidence. X1...
11.1.15 Question Help Construct a confidence interval for P1-P2 at the given level of confidence. X1 = 30, n = 269, X2 = 32, n = 300, 99% confidence and The researchers are % confident the difference between the two population proportions, P1 - P2, is between (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
Question 6 of 17 > Attempt 4 Suppose a researcher wishes to construct a 95% t-confidence...
Question 6 of 17 > Attempt 4 Suppose a researcher wishes to construct a 95% t-confidence interval for the difference of two independent means with unknown population standard deviations. His sample sizes are ni = 8 and n2 = 9, and his calculated Satterthwaite approximate degrees of freedom are 9.913. What is the positive t-critical value for this confidence interval, rounded to 3 decimal places? 1 = 2.228 Incorrect
Construct a confidence interval for P1 - P2 at the given level of confidence. Xy =...
Construct a confidence interval for P1 - P2 at the given level of confidence. Xy = 33, ny = 265, X2 = 30, n2 = 283, 90% confidence and : The researchers are % confident the difference between the two population proportions, P1-P2, is between (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
Construct a confidence interval for P1 - P2 at the given level of confidence. X1 =...
Construct a confidence interval for P1 - P2 at the given level of confidence. X1 = 366, n = 512, X2 = 422, n2 = 563, 95% confidence and The researchers are % confident the difference between the two population proportions, P1-P2, is between (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
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...
X11.1.15 Construct a confidence interval for p - p2 at the given level of confidence. X1...
X11.1.15 Construct a confidence interval for p - p2 at the given level of confidence. X1 28, n1 236, x2 40, n2 308, 99% confidence % confident the difference between the two population proportions, p - P2. is between The researchers are and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
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%...
11. Construct the indicated confidence interval for the
difference between population proportions. Assume
that the samples are independent and that they have been randomly
selected.
A marketing survey involves product recognition in New York and
California. Of 558 New Yorkers surveyed, 193 knew the product while
196 out of 614 Californians knew the product. Construct a 99%
confidence interval for the difference between the two population
proportions.
12. Construct the indicated confidence interval for the
difference between population proportions. Assume...
construct a confidence interval:
Construct a confidence interval for Pi-P2 at the given level of confidence x = 27.-253. x2 40,12 - 321, 95% confidence The researchers are confident the difference between the two population proportions. Pr - P2, is between and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed)
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....
11.1.15 Question Help Construct a confidence interval for P1-P2 at the given level of confidence. X1 = 30, n = 269, X2 = 32, n = 300, 99% confidence and The researchers are % confident the difference between the two population proportions, P1 - P2, is between (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
Question 6 of 17 > Attempt 4 Suppose a researcher wishes to construct a 95% t-confidence interval for the difference of two independent means with unknown population standard deviations. His sample sizes are ni = 8 and n2 = 9, and his calculated Satterthwaite approximate degrees of freedom are 9.913. What is the positive t-critical value for this confidence interval, rounded to 3 decimal places? 1 = 2.228 Incorrect
Construct a confidence interval for P1 - P2 at the given level of confidence. Xy = 33, ny = 265, X2 = 30, n2 = 283, 90% confidence and : The researchers are % confident the difference between the two population proportions, P1-P2, is between (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
Construct a confidence interval for P1 - P2 at the given level of confidence. X1 = 366, n = 512, X2 = 422, n2 = 563, 95% confidence and The researchers are % confident the difference between the two population proportions, P1-P2, is between (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
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...
X11.1.15 Construct a confidence interval for p - p2 at the given level of confidence. X1 28, n1 236, x2 40, n2 308, 99% confidence % confident the difference between the two population proportions, p - P2. is between The researchers are and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
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