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MATLAB: An Introduction with Applications
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Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Current Attempt in Progress
Use a t-distribution to find a confidence interval for the difference in means u, = , - 4, using the relevant sample results from
paired data. Assume the results come from random samples from populations that are approximately normally distributed, and that
differences are computed using d = x- x2.
A 99% confidence interval for u, using the paired data in the following table:
Case
1
2
4
Treatment
21
30
26
29
Treatment
17
29
21 22
Give the best estimate for u,, the margin of error, and the confidence interval.
Enter the exact answer for the best estimate, and round your answers for the margin of error and the confidence interval to two
decimal places.
best estimate
margin of error =
to
The 99% confidence interval is
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MacBook Air
II
24
3.
27](https://content.bartleby.com/qna-images/question/915c192e-d8ba-4859-b60e-5e514228af12/9050eac9-abad-474e-a1b0-50ef99e2c6ef/x4k86i_thumbnail.jpeg)
Transcribed Image Text:Question 1 of/
-/1
Current Attempt in Progress
Use a t-distribution to find a confidence interval for the difference in means u, = , - 4, using the relevant sample results from
paired data. Assume the results come from random samples from populations that are approximately normally distributed, and that
differences are computed using d = x- x2.
A 99% confidence interval for u, using the paired data in the following table:
Case
1
2
4
Treatment
21
30
26
29
Treatment
17
29
21 22
Give the best estimate for u,, the margin of error, and the confidence interval.
Enter the exact answer for the best estimate, and round your answers for the margin of error and the confidence interval to two
decimal places.
best estimate
margin of error =
to
The 99% confidence interval is
eTexthook and Media
MacBook Air
II
24
3.
27
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- A sample of 20 items provides a sample standard deviation of 4.arrow_forwardThe pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain storms. The sample mean is 4.6982 and the sample variance is 0.39623. Obtain a 99% confidence interval for the mean pH of the population of storms at that location.arrow_forwardThe following data represent the length of time, in days, to recovery for patients randomly treated with one of two medications to clear up severe bladder infections. Find a 99% confidence interval for the difference µ, - H, between in the mean recovery times for the two medications, assuming normal populations with equal variances. Medication 1 n = = 10 x, = 17 = 1.9 Medication 2 n2 = 14 X2 = Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. = 19 S2 = 1.5 .... . The confidence interval isarrow_forward
- Age Differences In a large hospital, a nursing director selected a random sample of 43 registered nurses and found that the mean of their ages was 31.5. The population standard deviation for the ages is 4.5. She selected a random sample of 32 nursing assistants and found the mean of their ages was 29.7. The population standard deviation of the ages for the assistants is 5.3. Find the 95% confidence interval of the differences in the ages. Use μ1 for the mean age of the nursing assistants. Round the answers to at least one decimal place. Use a TI-83 Plus/TI-84 Plus calculator. ? < μ1- μ2 < ?arrow_forwardFind the critical value x²R corresponding to a sample size of 19 and a confidence level of 99 percent. X²R = (Round to 3 decimals)arrow_forwardIn a random sample of 19 people, the mean commute time to work was 33.6 minutes and the standard deviation was 703 minutes. Assume the population is normally distributed and use a t- distribution construct a 80% confidence interval for the population mean u. What is the margin error of u? Interpret the results.arrow_forward
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