) Find the 99% confidence interval (CI) and margin of error (ME) used to estimate the population proportion for a clinical test with 175 subjects when p ̂=72% showed improvement from the treatment. Interpret your result

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Q: Several years ago, 50% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given claim: 50% of the parents who had children in grades K-12 were satisfied with the quality of…

Q: B. DEGREE OF CONFIDENCE AND MARGIN OF ERROR 1. Find the margin of eTor if the confidence…

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Q: Over the break, you do some reasearch. In a random sample of 250 U.S. adults, 56% said they ate…

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Q: Several years ago, 39% of parents who had children in grades K-12 were satisfied with the quality of…

A: I have used Excel function = NORMSINV() for finding critical value

Q: What is the purpose of finding a confidence interval for a proportion?

A: A true (or population) proportion (denoted as p), by definition, is essentially determined as the…

Q: There are many reasons adults use credit cards. A recent survey found that 66% of adults used credit…

A: 66% of adults use credit cards for convenience.Confidence level is 99% i.e., 0.99.Margin of error is…

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Q: have the same sample means but different confidence intervals. What are the implications for Dr.…

A: Dr. Richard's research study includes 3 fertilizers used for crop Fertilizer Mean, Crop Yield…

Q: Several years ago, 33% of parents who had children in grades K-12 were satisfied with the quality of…

A: The formula for the confidence interval for the proportion is, Here, confidence level is 0.90. Use…

Q: Several years ago, 49% of parents who had children in grades K-12 were satisfied with the quality of…

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Q: p'= α %4 || Margin of Error: E We are 87% confident that the proportion of Americans who feel that…

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Q: A credit score is used by credit agencies (such as mortgage companies and banks) to assess the…

A: We have to find conclusion from given solution.

Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

Q: How does the sample size and percentage of confidence influence the width of a confidence interval?

A: We have to define effect on width of C.I.

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: How do you solve? ref W9Q7.

A: For Women nw=10 α=1-0.90=0.10 Degrees of freedom is obtained as- df=10-1=9 The mean and standard…

Q: economy of cars manufactured in 2012. Use these statistics to calculate a 98% confidence interval…

A: Lower bound=-5.400 Upeer bound =1.670

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: An exterminator claims that no more than 10% of the homes he treats have termite problems within 1…

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Q: Several years ago, 50% of parents who had children in grades K-12 were satisfied with the quality of…

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Q: How can we compare the P-value to the significance level α.?

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Q: Construct a 99% confidence interval to assess whether this represents evidence that parents'…

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A: Given: Margin of error (E)= 30 The 99% confidence interval is (0.20, 0.21) The value of p is…

Q: Construct a 90% confidence interval estimate of the proportion of Lipitor users who will report…

A: The drug Lipitor is meant to lower cholesterol levels. In a clinical trial of 800 patients, 5%…

Q: Define the association between variables selected? What is the probability a car on the list will be…

A: Given information: Given data represents the values of the variables Price ($), cost (miles), road…

Q: What does Level of Confidence indicates?

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Q: A sample of 1,000 employees in an international company was taken to estimate the average…

A: Confidence interval of mean is given by, (X bar + - Z* sigma/√n) Where X bar is mean and sigma is…

Q: What are two ways to get a narrower confidence interval for a proportion?

A: Two ways to get a narrower confidence interval for a proportion are:

Q: Several years ago, 50% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given Data Sample Size, n = 1105 Number of successes, x = 491.0 confidence…

Q: As part of an effort to induce the public to conserve energy, a researcher wanted to analyze the…

A: Hypotheses:The hypotheses for testing the significance of the relationship between independent…

Q: Sample information: 24 out of 1000 people who were surveyed had type 2 diabetes. Use the above…

A: Given n=1000 x=24

Q: A SURVEY WAS CONDUCTED IN 2010 AND 2020. THE 2010 RESULTS SUMMARIZED T WHEREAS THE RESULTS OF THE…

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Q: What happens to the width of a confidence interval as the significance level, a, decreases?

A: There is two things Significance level: which is the prefixed probability of type I error before any…

Q: several years ago, 48% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given that  Sample size n =1035 Favorable cases x =497 Sample proportion p^=x/n  =497/1035 =0.4802

Q: A small business wanted to estimate the mean income from their customers. They took a sample of 256…

A: We have to find  the 90% confidence interval estimate for the population mean income of their…

Q: What is the multiplier for an interval that estimates the proportion with  a. 88% confidence?  b.…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: A soft drink company surveys 500 shoppers and finds that 61% of shoppers prefer diet soda to regular…

A: