A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 1.5% margin of error at a 97.5% confidence level, what size of sample is needed? When finding the z-value, round it to four decimal places.

Q: One sample of scores has a mean of M = 45 and a sample size of n = 10 scores.  A second sample of…

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Q: Aspirin prevents blood from clotting and helps prevent strokes. The Second European Stroke…

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Q: Professor Fair believes that extra time does not improve grades on exams. He randomly divided a…

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Q: A sample of 25 bottles of orange juice were measured and the sample standard deviation is 1.8…

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Q: Work Time Lost due to Accidents At a large company, the DIirector of Research found that the average…

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Q: A health researcher computed 90%, 95%, 98%, and 99% confidence intervals for the proportion of…

A: Given that a health researcher computed 90%, 95%, 98%, and 99% confidence intervals for the…

Q: n 1971, there was a shift in attitudes, as Americans’ “ideal” family switched from four kids to two…

A: The median would stay the same as it is not affected by outliers   The mean would increase as it is…

Q: Dylan wants to determine a 95% confidence interval for the true proportion of high school students…

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Q: main, the

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Q: Compute the test statistic. Round to two decimal places.

A: Sample size, n=2027 No. of adults who drank diet soda, x=485

Q: Use the sample data and confidence level given below to complete parts (a) through (d). A research…

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Q: rouble locating the Sample proportion and confidence level

A: It is given that n = 2,321 and x = 719.

Q: Twenty years​ ago, 47​% of parents of children in high school felt it was a serious problem that…

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Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…

A: The given situation follows binomial distribution. The proportion of people born in United States…

Q: Out of 600 people sampled, 270 preferred Candidate A. Based on this, estimate what proportion of the…

A: Given information: The sample size is n=600. Let x be the number of people who preferred Candidate…

Q: Emilio wants to estimate the percentage of people who have a financial adviser. He surveys 350…

A: given data  n = 350 x = 76 we have to interprete 99% confidence intervl.

Q: A school counselor randomly selects a sample of 30 students to investigate the impact of a behavior…

A: Solution-:A school counselor randomly selects a sample of 30 students to investigate the impact of a…

Q: Aspirin prevents blood from clotting and helps prevent strokes. The Second European Stroke…

A: Given ,  Aspirin alone :  Sample size = n1 = 200  Number of strokes = x1= 60 Sample proportion = p^1…

Q: . A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

A: The 95% confidence interval for proportion of fans who love music of David Wilcox is 0.74 to 0.86

Q: You would like to construct a 99% confidence interval to estimate the population mean score on a…

A: Solution: Let X be the score. From the given information, x-bar=485 and S=70. Here, it needed to…

Q: Yessica thought that there was a correlation between the amount of time students slept the evening…

A: From the given information assume that x defines the sleep time the evening before the final exam…

Q: A new fertilizer was applied to the soil of 222 bean plants. 28% showed increased growth. Find the…

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Q: Scott wants to find a 95% confidence interval for the average GPA for Allegany College of Maryland…

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Q: USA Today reported that about 47% of the general consumer population in the United States is loyal…

A: From the provided information, 47% of the general consumer population in the United States is loyal…

Q: medicine. In a recent survey, 2500 teenagers are asked whether or not they use that particular…

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Q: Use the confidence interval to find the margin of error and the sample mean. (12, 20) O E = 4, X =…

A: confidence interval for mean : (12,20)

Q: State the appropriate null and altemate hypotheses. Ho This hypothesis test is a (Choose one) test.…

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Q: Which of the following Z values would you use to calculate the 95% confidence interval? 1.28 1.96…

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Q: Number of Jobs The U.S. Bureau of Labor and Statistics reported that a person between the ages of 18…

A: Claim : The U.S Bureau of labor and Statistic reported that a person between the ages of 18 and 34…

Q: - 0.287). This means ance that a pair of rande

A: here we can see that administrator found no significant difference between mean GPA for male and…

Q: Construct the 99% confidence interval for the difference when 3-47688, -318.32, -42.11, -2680, -19,…

A: Test hypothesisNull Hypothesis H0: μ1=μ2Alternative Hypothesis Ha: μ1≠μ2For group 1 Sample size…

Q: You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You…

A: Suppose p is the true population proportion of workforce has two or more jobs.

Q: A professor believes that his math students have different IQ than the average college students. He…

A: Given that, The random variable X is normally distributed. And sample size is 30=~ infinite so we…

Q: you take a sample in equal 25 of test scores from a population. The sample mean is 38, and the…

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

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Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.25…

A: The provided information are:

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.