Lipitor In clinical trials of the drug Lipitor (atorvastatin), 270 subjects were given a placebo and 7 of them had allergic reactions. Among 863 subjects treated with 10 mg of the drug, 8 experienced allergic reactions. Construct the two 95% confidence interval estimates of the percentages of allergic reactions. Compare the results. What do you conclude?

Q: Researchers are testing whether a new treatment significantly changes the happiness of a group as…

A: The given data is measure of happiness for both groups after a month of receiving treatment.

Q: A survey of 700 non-fatal accidents showed that 167 involved uninsured drivers. Construct a 99%…

A: Given data,n=700x=167Point estimate isp=xn=167700=0.2386Construct a 99% confidence interval?

Q: A random sample of 230 people living in Seattle found that 83 of them had a pet. A random sample of…

A: Solution: Given information: n1= 230 Sample size of people iving in Seattle n2= 172  Sample size of…

Q: We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 500…

A: The sample proportion of the sample of size n can be defined as:  Here, X = Total number of success…

Q: A study investigated ways to prevent staph infections in surgery patients. The researchers examined…

A: From the provided information, Sample size (n) = 100 From which 88 patients tested positive for…

Q: What is the upper bound of the confidence interval? A 98% confidence interval for the data: 25, 38,…

A: We have given data, X 25 38 62 45 61 38 21 42 31 35 The confidence level is 1-α=0.98.

Q: According to a report on consumer fraud and identity theft, Indiana had 1671 complaints of identity…

A:

Q: How much more likely are college men than college women to participate in intramural sports?  A…

A: Given information: Number of college men surveyed, n1=688 Number of college women surveyed, n2=579…

Q: You plan to conduct a survey to find out the proportion of students who enjoy taking classes…

A: Given  The margin of error is given as m=0.02 At a 90% confidence interval, α=0.1 As the proportion…

Q: A study at Harvard found that 44% of their students binge drink. You are at Princeton doing a…

A:

Q: Psychologists at a university compared the levels of alcohol consumption of male and female freshman…

A: Fol

Q: What is the impact of changing from the 95% confidence interval to the 90% confidence interval? The…

A: Confidence Interval Confidence Interval refers to the range of the value that we expect our estimate…

Q: This was a question on my homework and I would like to know if I answered it correctly. Thank you…

A: Odds (O):The “odds” of the occurrence of an event is the ratio of the number of occurrences of the…

Q: Sales of trumpets in a day is modeled as Normal. A random sample of 36 days is looked at. The sample…

A:

Q: 20. OxyContin The drug OxyContin (oxycodone) is used to treat pain, but it is dangerou because it is…

A:

Q: How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95%…

A:

Q: oning in

A: To determine if the confidence interval supports the claim, check if the claimed population…

Q: 25. Lipitor In clinical trials of the drug Lipitor (atorvastatin), 270 subjects were given a pla-…

A: In this case, the estimated population proportion (i.e., the proportion of subjects with allergic…

Q: you used the percentage of alcohol to predict wine quality. The data are stored in Vinho Verde. For…

A: a. To construct a 95% confidence interval estimate of the mean wine quality rating for all wines…

Q: You want to get a 95% confidence interval for the difference between the percentage of females with…

A:

Q: What does Level of Confidence indicates?

A:

Q: For each scenario below, decide if it would be appropriate to use (1) Critical z-values or (2)…

A: Solution To find the confidence interval we will use Excel According to the guidelines we solve only…

Q: Explain when you would use the z value or the t-value to calculate a confidence interval

A: Z value: The z value is used for finding the confidence intervals for single population proportion,…

Q: A study found a confidence interval on the proportion of children that are hearing impaired was 0.04…

A: Given confidence interval is 0.04 to 0.16 i.e., p-E=0.04 -->1 p+E=0.16 -->2

Q: For a confidence level of 99% with a sample size of 22, find the t-score. Did not see how to work…

A: The provided information is:

Q: What proportion of new drivers fail the written portion of their driver's license examination? You…

A: Given Data: p=196/500=0.392   n=500   z-value corresponding to 95% Confidence level=1.96

Q: Determine the margin of error. It has been determined with 95% confidence that the proportion of…

A: Given: 95% confidence interval is (0.78, 0.82) So, Lower limit = 0.78 Upper limit = 0.82

Q: Construct the 99.8% confidence interval for the difference P1 - P2 when x, = 23, n, = 53, x2 = 15,…

A:

Q: In a science fair​ project, Emily conducted an experiment in which she tested professional touch…

A: Given data, n=330 x=155 sample proportion p=x/n =155/330=0.47   z-value at 95% confidence is zc=1.96

Q: If n = 440 and p = 0.52, construct a 90% confidence interval. %3D Give your answers to three…

A: Given information- Sample size, n = 440 Confidence level, c = 0.90 So, significance level (α) = 0.1…

Q: What is the lower endpoint of a 95% confidence interval for the percent of students who like online…

A: Given Level of significance ɑ=0.05, x=92, n=134

Q: In a clinical test with 500 subjects, 2500 showed improvement from the treatment. find the margin of…

A: we have given that  sample size=N=2500 . , favorable cases =X=500 sample proportion…

Q: How effective is the flu shot?  In a control study, 94 of the 859 participants who received the…

A: Given ,  x1==94 , n1=859x2==46 , n2=923p1=x1n1=94859=0.1094p2=x2n2=46923=0.0498 α=0.05

Q: A researcher surveys a group of college students to determine the negative life events that they…

A: The given values are

Q: A recent study of over 1000 parents on cyberbullying showed that a 95% confidence interval of…

A: From the given information, 95% confidence interval of proportion of kids who faced bullying in…

Q: In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with…

A: We have given that  Sample size n=45 Sample mean =3.3 , standard deviation =18.4 Degree of freedom =…

Q: You are comparing men and women on hours spent watching TV. You pick a sample of 12 men and 14 women…

A:

Q: A researcher gathered a sample of participants who volunteered for a studying of phobias. She…

A: A researcher gathered a sample of participants who volunteered for a studying of phobias. She…

Q: A random sample of 500 males included 215 that approved of the performance of a President. A random…

A: Given X1=215 X2=185 n1=n2=500

Q: c=99 o= 3 n= 11 what is 99% confidence interval?

A: The given dataset is: c=99σ=3n=11

Q: A random sample of 300 college freshmen found that 112 of them own an iPhone. Find a 95% confidence…

A: Let n be the random sample , X be the number of own iPhone  Given n=300, X=112  Construct 95% CI for…

Q: In a simple random sample of 1200 Americans age 20 and over, 138 of them were found to have Type I…

A: In a simple random sample of 1200 Americans age 20 and over, 138 of them were found to have Type I…

Q: Identify the t-score for a 95% confidence interval if the sample size is 15. t =

A: Givenconfidence interval = 95%sample size(n)=15

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.