Surgical complications: A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result incomplications.Part: 0 / 2Part 1 of 2(a) An article in a medical journal suggested that approximately 13% of such operations result in complications. Using this estimate, what sample size isneeded so that the confidence interval will have a margin of error of 0.07?A sample of | operations is needed to obtain a 99% confidence interval with a margin of error of 0.07 using the estimate0.13 for p.NOVWMacBook AirDIIDDF11吕0888F7F4F2F3$%&@2346* 00

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Answered: Surgical complications: A medical…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0 2 32 34 -2 3 24 25 -1 4 28 30 -2 5 26 29 -3 Calculate the Upper 95% Confidence Interval (of the difference). (round to 2 decimal places)
Suppose a drug for stomach discomfort is tested on 50 subjects, and the mean time for it to take effect on these 50 subjects is 80 seconds, with a population standard deviation of 10 seconds. (a) What is the 95% confidence interval for the (population) mean amount of time it will take effect on a person from that given population? (b) What about the 99% confidence interval?
In a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1=not attractive; 10=extremely attractive). A) Construct a confidence interval using a 95% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females? 7, 9, 3, 10, 6, 4, 6, 9, 9, 10, 4, 8 What is the confidence interval for the population mean μ? ___<μ<___. (Round to one decimal place as needed.) B) What does the confidence intervcal tell us about the population of all adult females? Select the choices below. A. We are 95 percent confident that the interval from ___ to ___ actually contains the true mean attractiveness rating of all adult females. (Round to one decimal place as needed). B. The results tell nothing about the population of all adult females, because participants in speed dating are not a representative sample of all adult…
What is different about the normality requirement for a confidence interval estimate of the population standard deviation and the normality requirement for a confidence interval estimate of the population mean?
A multiple-comparison procedure for comparing four treatment means produced the confidence intervals shown to the right. Rank the means from smallest to largest. Which means are significantly different? (H1 - H2): (4,17) (H1 - H3): (5,8) (H1 - H4): (- 12,2) (H2 - H3):(-4,11) (H2 - H4):(-13, - 5) (H3 - H4):(-8, - 3) Rank the means from smallest to largest. Select the correct answer below. O A. (H1 H4) < (H2.H3) Oc. (41.42) < (H3-H4) O E. (H2.H3) (H1.H4) O B. (H3-H4) < (H1 2) O D. (41.43) < (42-H4) OF. (42:4) < (41.H3) Which means are significantly different? Select all that apply. O A. H, and P4 O B. H, and µ2 O C. H, and H3 O D. H, and H4 O E. Ha and H4 O F. H, and H3
What critical values would you use to calculate the 90% confidence interval if your sample size is 25?
Rock band The Rolling Stones have played scores of concerts in the last twenty years. For 30 randomly selected Rolling Stones concerts, the mean gross earnings is 2.18 million dollars. Part a) Assuming a population standard deviation gross earnings of 0.53 million dollars, obtain a 99% confidence interval for the mean gross earnings of all Rolling Stones concerts (in millions).Confidence interval: ( , ). Part b)Which of the following is the correct interpretation for your answer in part (a)?A. If we repeat the study many times, 99% of the calculated confidence intervals will contain the mean gross earning of all Rolling Stones concerts.B. We can be 99% confident that the mean gross earnings for this sample of 30 Rolling Stones concerts lies in the intervalC. There is a 99% chance that the mean gross earnings of all Rolling Stones concerts lies in the intervalD. None of the above
Question: How is the confidence interval for the difference between the means of two independent samples calculated using the t-test?
True or false? A researcher wants to estimate the impact prenatal care during pregnancy can have on premature deliveries by conducting a retrospective case-controlled study on new moms. If the prevalence of premature births is 10.9%, the researcher should enroll a total of 586 women in the study if the researchers want to construct a 90% confidence interval fir the difference in proportions that has a margin of error of no more than 3%.
True or False? A researcher wants to be sure the mean difference in the change in blood pressure has a margin of error no more than 5 points and the difference in the standard deviation between the mean blood pressure points from the first medication used to treat high blood pressure and the second medication used to treat high blood pressure is 14 points. The desired sample size required to ensure a 95% confidence interval for the proposed study used to compare the efficacy of two medications used to treat high blood pressure during a cross-over trial is n = 31.
27)
A large multinational corporation recently implemented an ERP system. A survey was done to determine the level of satisfaction with the new system. Out of the 350 managers surveyed, 280 indicated that they were satisfied. - What is the lower limit of the 95% confidence interval on the proportion of satisfied managers? (three decimal places) -What is the upper limit of the 95% confidence interval on the proportion of satisfied managers? (three decimal places)

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