Homework Answers
Answer : Q.6)
You can be 95% confident that you have selected a sample whose interval includes the population mean.
( Explanation : 95% CI is range of values that you can 95% certain contain the true mean of the population. This is not the same as a range of contain 95% of the values. )
Answer : Q.7)
All of the above are properties of the t distribution.
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QUESTION 6 A 95% confiden ce interval for the mean can be interpreted to mean which of the following? If all possi...
Which of the following is NOT a property of the t-distribution? a. it is symmetric b....
Which of the following is NOT a property of the t-distribution? a. it is symmetric b. its a shape size grows large, it gradually approaches the normal distribution c. its shape (spread) is determined by the degrees of of freedom d. it has fatter tails than the normal distribution e. all the above are properties of the t distribution
urgent one hours plz help quick The correct interpretation of a 95% confidence interval (a, b)...
urgent one hours plz help quick The correct interpretation of a 95% confidence interval (a, b) for the population mean μ is: Question 10 options: No answer is correct. We are 95% confident that the mean of the sampling distribution is the population mean μ. We are 95% confident that sample statistic is near the population parameter. We are 5% confident that the interval (a,b) will not contain the sample mean. We are 95% confident that the population mean μ...
which of the following correctly describes a 95% confidence interval for a mean? Circle the correct...
which of the following correctly describes a 95% confidence interval for a mean? Circle the correct answer. e, A range within which 95% of all possible sample means fall An interval constructed using a procedure such that 95% of intervals constructed this way will contain the population mean. A range within which 90% of all data values in the population fall All of the above None of the above . ii. iii. iv. v.
Let's say we have constructed a 95% confidence interval estimate for a population mean. Which of...
Let's say we have constructed a 95% confidence interval estimate for a population mean. Which of the following statements would be correct? A. We expect that 95% of the intervals so constructed would contain the true population mean. B. We are 95% sure that the true population mean lies either within the constructed interval or outside the constructed interval. C. Taking 100 samples of the same size, and constructing a new confidence interval from each sample, would yield five intervals...
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....
8.1.5 Question Help Determine the 95% confidence interval estimate for the population mean of a normal...
8.1.5 Question Help Determine the 95% confidence interval estimate for the population mean of a normal distribution given n = 100, o = 133, and x = 1,500 The 95% confidence interval for the population mean is from to (Round to two decimal places as needed. Use ascending order.) 8.1.14-T Question Help As a follow-up to a report on gas consumption, a consumer group conducted a study of SUV owners to estimate the mean mileage for their vehicles. A simple...
Question 6 are Consider a sannple 2,Z2, . .. , arn from M2(μ Σ). The sample mean and sample covariance , and S11 $12 821 S22 CE respectively (a) Find a 95% confidence interval of μ1-μ2. (b) Assume...
Question 6 are Consider a sannple 2,Z2, . .. , arn from M2(μ Σ). The sample mean and sample covariance , and S11 $12 821 S22 CE respectively (a) Find a 95% confidence interval of μ1-μ2. (b) Assume s12 > 0, and someone ignores this positive correlation and takes the wrong sample covariance 811 0 0 822 ill this person derive a wider or narrower 95% confidence interval of μ-μ2 than the correct one? Explain.
Question 6 are Consider a...
Which of the following is true about a 95% confidence interval, with a known sigma? a....
Which of the following is true about a 95% confidence interval, with a known sigma? a. The corresponding value for z is 1.65 b. 95% of similarly constructed intervals would contain the population mean. c. we can use either the t or z distribution, whichever we prefer d. All options are true
Question 6 (6 points) Compute a 95% confidence interval for the population mean, based on the...
Question 6 (6 points) Compute a 95% confidence interval for the population mean, based on the sample numbers 21, 28, 33, 34, 25, 26, and 135 Which table do we use to find the margin of error? Z-Table T-Table G-Table F-Table
In a 95% confidence interval. i 1-0.0s is called the confidence coefficient. A) True lB) False...
In a 95% confidence interval. i 1-0.0s is called the confidence coefficient. A) True lB) False If a 95% confidence interval on the mean has a lower limit of 10 and an upper limit that 95% of the time the true value of the mean is between 10 and 15. ) True B) False For a fixed value of the standard deviation and a fixed sample size, a confidence inte population mean will get longer as the level of confidence...
which of the following correctly describes a 95% confidence interval for a mean? Circle the correct answer. e, A range within which 95% of all possible sample means fall An interval constructed using a procedure such that 95% of intervals constructed this way will contain the population mean. A range within which 90% of all data values in the population fall All of the above None of the above . ii. iii. iv. v.
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....
8.1.5 Question Help Determine the 95% confidence interval estimate for the population mean of a normal distribution given n = 100, o = 133, and x = 1,500 The 95% confidence interval for the population mean is from to (Round to two decimal places as needed. Use ascending order.) 8.1.14-T Question Help As a follow-up to a report on gas consumption, a consumer group conducted a study of SUV owners to estimate the mean mileage for their vehicles. A simple...
Question 6 are Consider a sannple 2,Z2, . .. , arn from M2(μ Σ). The sample mean and sample covariance , and S11 $12 821 S22 CE respectively (a) Find a 95% confidence interval of μ1-μ2. (b) Assume s12 > 0, and someone ignores this positive correlation and takes the wrong sample covariance 811 0 0 822 ill this person derive a wider or narrower 95% confidence interval of μ-μ2 than the correct one? Explain.
Question 6 are Consider a...
Question 6 (6 points) Compute a 95% confidence interval for the population mean, based on the sample numbers 21, 28, 33, 34, 25, 26, and 135 Which table do we use to find the margin of error? Z-Table T-Table G-Table F-Table
In a 95% confidence interval. i 1-0.0s is called the confidence coefficient. A) True lB) False If a 95% confidence interval on the mean has a lower limit of 10 and an upper limit that 95% of the time the true value of the mean is between 10 and 15. ) True B) False For a fixed value of the standard deviation and a fixed sample size, a confidence inte population mean will get longer as the level of confidence...
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