Which statement is false? The "plus four" method is used when estimating a population proportion to...
Which statement is false?
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The "plus four" method is used when estimating a population proportion to obtain a more accurate confidence interval. |
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You can use Student's t distribution with both qualitative and quantitative data. |
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The error bound for a population mean (EBM) is sometimes called the margin of error. |
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When estimating a population mean, if the population standard deviation is unknown you should use Student's t distribution. |
Homework Answers
You can use students t distribution with both qualitative and quantitative data. This statement is false because students t is used only for quantitative data since it requires assumption of Normality.
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Which statement is
false?
The "plus four" method
is used when estimating a population proportion to...
6. An airline is interested in estimating the mean number of unoccupied seats per flight over...
6. An airline is interested in estimating the mean number of unoccupied seats per flight over the past year. They randomly select 250 flights and count the number of unoccupied seats per flight. The sample mean is 12.2 seats with a sample standard deviation of 3.5 seats. Based on previous studies they know that the population standard deviation is 3.6 seats. (a) Find each of the following quantities. • i= .0= s = n= (b) Use the following steps to...
Suppose that the wait times for patients in an emergency room are normally distributed with an...
Suppose that the wait times for patients in an emergency room are normally distributed with an unknown mean and standard deviation. A random sample of 18 patients is taken and gives a sample mean of 25 minutes and a sample standard deviation of 2 minutes. As found above, the EBM, margin of error, for a 95% confidence interval estimate for the population mean using the Student's t-distribution is 0.99. Find a 95% confidence interval estimate for the population mean using...
Constructing Confidence Intervals, Part 1: Estimating Proportion Assume that a sample is used to estimate a...
Constructing Confidence Intervals, Part 1: Estimating Proportion
Assume that a sample is used to estimate a population proportion p.
Find the margin of error E that corresponds to the given statistics
and confidence level: In a random sample of 200 college students,
110 had part-time jobs. Find the margin of error for the 98%
confidence interval used to estimate, for the entire population of
college students, the percentage who have part-time jobs. Round
your answer to three decimal places.
Please...
a. Assume that a sample is used to estimate a population proportion p. Find the 95%...
a. Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 198 with 42 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. 95% C.I. = b. A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 0.5% margin of error at a 99% confidence...
Question 1 to 11, True or False? Applied business statistics 1) The width of the confidence...
Question 1 to 11, True or False? Applied business statistics
1) The width of the confidence interval depends only on the desired level of confidence 2) When population standard deviation is unknown, sample standaird deviation is used and the interval estimation is based on values from the t- rather than the z-distribution n 3) The z value for a 98% confidence interval around the point estimate is 2.33 4) In order to construct a 90% confidence interval for the population...
Answers only is okay! Construct the indicated confidence interval for the population mean μ using the...
Answers only is okay! Construct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed. c=0.99, x=13.1, s=3.0, n= 6 Construct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed. c=0.95, x=14.5, s=0.55, n= 15 Use the given confidence interval to find the margin of error and the sample mean. (12.7,19.9The sample mean is In a random sample of 18 people, the mean...
Find the margin of error for a 95% confidence interval for estimating the population mean when...
Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 92, with a sample size of (a) 400,(b) 1800. What is the effect of the sample size? 2. The margin of error for a 95% confidence interval with a sample size of 400 is (Round to the nearest tenth as needed.) b. The margin of error for a 90% confidence interval with a sample size of 1600 is (Round...
Problem 3 There are 50 lamb snacks in a pack of Pateral for a population proportion...
Problem 3 There are 50 lamb snacks in a pack of Pateral for a population proportion of lamb snacks "Doggy Meat Snacks". Te total number of snacks in the bag is 100 we wish to calulate 90% cotidece Expand Al 03%) which distribution should you use for this problem?[(pick one)v] a. b. (3%) The sample proportion is c. (3%) The critical value 4r" of the standard normal distribution for the 90% confidence interval is d. (3%) The standard error for...
The difference between the T distribution and the standard normal (z) distribution decreases as the degrees...
The difference between the T distribution and the standard normal (z) distribution decreases as the degrees of freedom increase. True False When estimating the number of responses to be collected in order to achieve a desired margin of error on a proportion, what value should be used for the population proportion if no estimate is available? Enter your answer as a decimal to 2 decimal places. A population is believed to have a standard deviation of 23.1. An analyst wants...
Question 1 Why can you never have 100% confidence in correctly estimating the population characteristic of interest? Whe...
Question 1 Why can you never have 100% confidence in correctly estimating the population characteristic of interest? When are you able to use the t distribution to develop the confidence interval estimation for the mean? Why is it true that for a given sample size, n, an increase in confidence is acheived by widening (and making less precise) the confidence interval? Why is the sample size needed to determine the proportion smaller when the population proportion is 0.20 than when...
6. An airline is interested in estimating the mean number of unoccupied seats per flight over the past year. They randomly select 250 flights and count the number of unoccupied seats per flight. The sample mean is 12.2 seats with a sample standard deviation of 3.5 seats. Based on previous studies they know that the population standard deviation is 3.6 seats. (a) Find each of the following quantities. • i= .0= s = n= (b) Use the following steps to...
Constructing Confidence Intervals, Part 1: Estimating Proportion
Assume that a sample is used to estimate a population proportion p.
Find the margin of error E that corresponds to the given statistics
and confidence level: In a random sample of 200 college students,
110 had part-time jobs. Find the margin of error for the 98%
confidence interval used to estimate, for the entire population of
college students, the percentage who have part-time jobs. Round
your answer to three decimal places.
Please...
Question 1 to 11, True or False? Applied business statistics
1) The width of the confidence interval depends only on the desired level of confidence 2) When population standard deviation is unknown, sample standaird deviation is used and the interval estimation is based on values from the t- rather than the z-distribution n 3) The z value for a 98% confidence interval around the point estimate is 2.33 4) In order to construct a 90% confidence interval for the population...
Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 92, with a sample size of (a) 400,(b) 1800. What is the effect of the sample size? 2. The margin of error for a 95% confidence interval with a sample size of 400 is (Round to the nearest tenth as needed.) b. The margin of error for a 90% confidence interval with a sample size of 1600 is (Round...
Problem 3 There are 50 lamb snacks in a pack of Pateral for a population proportion of lamb snacks "Doggy Meat Snacks". Te total number of snacks in the bag is 100 we wish to calulate 90% cotidece Expand Al 03%) which distribution should you use for this problem?[(pick one)v] a. b. (3%) The sample proportion is c. (3%) The critical value 4r" of the standard normal distribution for the 90% confidence interval is d. (3%) The standard error for...
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