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QUESTION 4 Which distribution would you make use of when constructing a confidence interval given the...
Procedures for constructing a confidence interval for a sample mean are given in section 7-2 on...
Procedures for constructing a confidence interval for a sample mean are given in section 7-2 on page 319. Example 2 worked on pages 320 and 321 can guide us. In my homework problem 40, the scenario is data on the salaries of 61 players on a football team. We are given that we are interested in the 95% confidence level and the population standard deviation is 3723 thousand dollars. From section 7-2, we know that to be able to use...
For most distributions, we can use the normal distribution to make a confidence interval for a...
For most distributions, we can use the normal distribution to make a confidence interval for a populatiorl mean provided that the population standard deviation σ is known and the sample size is: O greater than or equal to 30. O greater than 100 O greater than 30. O less than 25.
Use the standard nomal distribution or the distribution to construct a 95% confidence interval for the...
Use the standard nomal distribution or the distribution to construct a 95% confidence interval for the population mean. Justily your decisioni neither distribution can be used, explain why. Interpret the results In a random sample of 41 people, the mean body mass index (BMI) was 27.8 and the standard deviation was 6.11 Which distribution should be used to construct the confidence interval? Choose the correct answer below. O A Use a distribution because the sample is random, na 30, and...
Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the...
Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 48 people, the mean body mass index (BMI) was 26.1 and the standard deviation was 6.06. Which distribution should be used to construct the confidence interval? Choose the correct answer below.
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval...
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval for the population mean Justify your decision if neither distribution can be used, explain why Interpret the results ln a random sample of 17 mortgage institutions, the mean interest rate was 3.69% and the standard deviation was 36% Assume the iterest rates are normally distributed Which distribution should be used to construct the confidence interval? ○ A. Use a t-distribution because it is a...
a. Find a 95% confidence interval for μ. b. What do you mean when you say...
a. Find a 95% confidence interval for μ.
b. What do you mean when you say that a confidence coefficient
is .90?
c. Find a 99% confidence interval for μ.
d. What happens to the width of a confidence interval as the
value of the confidence coefficient is increased while the sample
size is held fixed?
e. Would your confidence intervals of parts a and c be valid if
the distribution of the original population were not normal?
Explain.
A...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
Use the standard normal distribution or the t-distribution to construct the indicated confidence interval for the...
Use the standard normal distribution or the t-distribution to construct the indicated confidence interval for the population mean of each data set. Justify your decision. If neither distribution can be used, explain why. Interpret the results. (a) In a random sample of 36 patients, the mean waiting time at a dentist’s office was 24 minutes and the standard deviation was 7.5 minutes. Construct a 90% confidence interval for the population mean. (b) In a random sample of 25 cereal boxes,...
When constructing a 95% confidence interval for a population mean μ, what is the most important...
When constructing a 95% confidence interval for a population mean μ, what is the most important condition that must be approximately satisfied so that in 95% of repeated samples the calculated intervals will cover the unknown value μ? A. The population standard deviation must always be small. B. The sample size n must be at least 100 (so that the Central Limit Theorem applies). C. The population from which the sample is drawn must be at least 10 times the...
QUESTION 21 If we change a 90% confidence interval estimate to a 99% confidence interval estimate...
QUESTION 21 If we change a 90% confidence interval estimate to a 99% confidence interval estimate while holding sample size constant, we can expect a. the width of the confidence interval to increase. b. the width of the confidence interval to decrease. c. the width of the confidence interval to remain the same. d. the sample size to increase. QUESTION 22 Which one of the following is a correct statement about the probability distribution of a t random variable? a....
For most distributions, we can use the normal distribution to make a confidence interval for a populatiorl mean provided that the population standard deviation σ is known and the sample size is: O greater than or equal to 30. O greater than 100 O greater than 30. O less than 25.
Use the standard nomal distribution or the distribution to construct a 95% confidence interval for the population mean. Justily your decisioni neither distribution can be used, explain why. Interpret the results In a random sample of 41 people, the mean body mass index (BMI) was 27.8 and the standard deviation was 6.11 Which distribution should be used to construct the confidence interval? Choose the correct answer below. O A Use a distribution because the sample is random, na 30, and...
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval for the population mean Justify your decision if neither distribution can be used, explain why Interpret the results ln a random sample of 17 mortgage institutions, the mean interest rate was 3.69% and the standard deviation was 36% Assume the iterest rates are normally distributed Which distribution should be used to construct the confidence interval? ○ A. Use a t-distribution because it is a...
a. Find a 95% confidence interval for μ.
b. What do you mean when you say that a confidence coefficient
is .90?
c. Find a 99% confidence interval for μ.
d. What happens to the width of a confidence interval as the
value of the confidence coefficient is increased while the sample
size is held fixed?
e. Would your confidence intervals of parts a and c be valid if
the distribution of the original population were not normal?
Explain.
A...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
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