15. Pain after surgery: In a random sample of 50 patientsundergoing a standard surgical procedure, 15 requiredmedication for postoperative pain. In a random sample of 90patients undergoing a new procedure, only 16 required painmedication.a. Construct a 95% confidence interval for the difference in theproportions of patients needing pain medication between theold and new procedures.b. A physician claims that the proportion of patients who needpain medication is the same for both procedures. Does theconfidence interval contradict this claim?16

Given : n1 = 50 x1 = 15 n2 = 90 x2 = 16

Answered: 15. Pain after surgery: In a random…

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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A genetic experiment with peas resulted in one sample of offspring that consisted of 443 green peas and 156 yellow peas.a. Construct a 90% confidence interval to estimate of the percentage of yellow peas.Express the percentage in decimal form.b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not 25%, do the results contradict expectations?
4. A market-research firm asked 300 people about their shampoo-purchasing habits. Fifty-five people said they bought S'No Flakes. Determine a 95% confidence interval for the percent of people who purchase S'No Flakes.
An issue of Time Style and Design reported on a poll conducted by Schulman Ronca & Bucuvalas Public Affairs about the shopping habits of wealthy Americans. A total of 603 interviews were conducted among a national sample of adults with household incomes of at least $150,000. Of the adults interviewed, 410 said they had purchased clothing, accessories, or books online in the past year. Find a 95% confidence interval for the proportion of all U.S. adults with household incomes of at least $150,000 who purchased clothing, accessories, or books online in the past year. Interpret the confidence interval. Complete with graph and syntax Excel.
The branch manager of an outlet store (Store 1) of a nationwide chain of pet supply stores wants to study the characteristics of her customers. In particular, she decides to focus on two variables: the amount of money spent by customers and whether the customers own only one dog, only one cat, or more than one dog and/or cat. The accompanying results are from a sample of 78 customers. Complete parts (a) through (e) below. a. Construct a 95% confidence interval estimate for the population mean amount spent in the pet supply store. (Round to two decimal places as needed.) b. Construct a 99% confidence interval estimate for the population proportion of customers who own only a cat. (Round to four decimal places as needed.) c. The branch manager of another outlet (Store 2) wishes to conduct a similar survey in his store. The manager does not have access to the information generated by the manager of Store 1. What sample size is needed to have 95% confidence of…
A pharmaceutical company is running tests to see how well its new drug lowers cholesterol. Thirteen adults volunteer to participate in the study. The total cholesterol level of each participant (in mg/dL) is recorded once at the start of the study and then again after three months of taking the drug. The results are given in the following table. Construct a 95% confidence interval for the true mean difference between the cholesterol levels for people who take the new drug. Let Population 1 be the initial cholesterol level and Population 2 be the cholesterol level after three months. Round the endpoints of the interval to one decimal place, if necessary. Total Cholesterol Levels (in mg/dL) Initial Level Level after Three Months 208 220 230 207 226 182 198 189 192 216 205 212 217 192 224 211 213 183 216 202 209 211 219 182 219 199
A genetic experiment with peas resulted in one sample of offspring that consisted of 431 green peas and 163 yellow peas. a. Construct a 90% confidence interval to estimate of the percentage of yellow peas. b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas from the sample is not 25%, do the results contradict expectations?
A genetic experiment with peas resulted in one sample of offspring that consisted of 424 green peas and 151 yellow peas. a. Construct a 90% confidence interval to estimate of the percentage of yellow peas. b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas from the sample is not 25%, do the results contradict expectations?
The tobacco industry closely monitors all surveys that involve smoking. One survey showed that among 785 randomly selected subjects who completed four years of college, 18.3% smoke (based on data from the American Medical Association). Construct the 98% confidence interval for the true percentage of smokers among all people who completed four years of college.
Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,015 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,015 surveyed, 467 indicated that they were satisfied. Construct a 99% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. a) What are the null and alternative hypotheses? please pick from the following symbols = ≠ ˃ ˂ (Round to two decimal places as needed.) see attached b) Use technology to find the 99% confidence interval. (____, ____) (Round to two decimal places as needed.) c) What is the correct conclusion? A. Since the interval does not contain the proportion stated in the null hypothesis, there is sufficient evidence that parents' attitudes toward the quality of education have changed. B. Since the…
A genetic experiment with peas resulted in one sample of offspring that consisted of 444 green peas and 157 yellow peas. a. Construct a 95% confidence interval to estimate of the percentage of yellow peas. b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not 25%, do the results contradict expectations?
A genetic experiment with peas resulted in one sample of offspring that consisted of 449 green peas and 169 yellow peas. a. Construct a 95% confidence interval to estimate of the percentage of yellow peas. b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not 25%, do the results contradict expectations?
4. An investigative reporter contacts a random sample of hotels, and finds a 95% confidence interval for the proportion of hotels in the United States that have reported having bedbugs is (0.04, 0.11). a. Interpret this confidence interval in context.

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