A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 2% margin of error at a 99.5% 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: You are interested in finding a 95% confidence interval for the mean number of visits for physical…

A: Given,mean(x¯)=13.6standard deviation (s)=9.1918sample size(n)=10degrees of…

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

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Q: survey to determine if the percentage of adults who use social media has changed from 52%, which was…

A: The sample proportion is computed as follows, The critical value for 96% confidence level, i.e.,…

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: 2ndP1] INSTRUCTION: Solve for the following. Show your complete solution and emphasize your final…

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

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Q: A software company is interested in improving customer satisfaction rate from the 60% currently…

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Q: additionally how would you find the: test statistic & p-value

A: The claim is that mean lead concentration is less than 19 μg/g Null hypothesis: H0 : µ=9 μg/g…

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

A: It is given that both sample sizes are 200, number of strokes for aspirin alone is 60 and number of…

Q: The table below summarizes the  results of a survey in which randomly selected people were asked how…

A: It is needed to test, whether the feelings on medical marijuana and gender are independent or not.

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: The time it takes for an airline to get the luggage to the airport baggage carousel after a flight…

A: Let X: The time takes for the luggage to reach the airport baggage carousel.X has a uniform…

Q: The Sky Train from the terminal to the rental car and long-term parking center is supposed to arrive…

A: GivenThe Sky Train from the terminal to the rental car and long-term parking center is supposed to…

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: ​Claim: Fewer than 95​% of adults have a cell phone. In a reputable poll of 1073 ​adults, 90​%…

A: Formula for Test statistic  Test statistic ( z ) z = ( p^ - p ) / ( √( p * ( 1 - p) / n) )

Q: Thirty randomly selected students took the calculus final. If the sample mean was 74.2 and the…

A: From the provided information, Sample size (n) = 30 Sample mean (x̅) = 74.2 Standard deviation (s) =…

Q: How

A: solution :  [ option B is correct 1068 ] given data Margin of Error E=0.03 Significance Level alpha…

Q: The third quartile of the data: 22,17,10,35,40,18,9 is equal to

A: we know that  It is the median of uppar values of data. Uppar values mean the data values which are…

Q: The first quartile of the data values 45, 48, 31, 48, 50, 30  equals ?

A: Arranging the data into ascending order: 30, 31, 45, 48, 48, 50

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: 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: z-score that is greater

A: we can assume it to be standard normal distribution with mean = 0 standard deviation = 1

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

A: from given data n=1087 x=562

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

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Q: Regan is interested in comparing the outdoor activity of people from different parts of the country.…

A: Analysis of variance (ANOVA) is a statistical technique that is used to check if the means of two or…

Q: A survey of 1195 CEOS finds that 717 believe the economy will improve next year. We are trying to…

A: We have given that,  Population proportion (p)= 66% = 0.66 and favorable cases (X) = 717 , sample…

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: There is a population of test scores. You take a sample of 11 scores and use them to estimate the…

A: From the given information, Sample size (n) =11 Assuming population is normally distributed with…

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: Thanks. Why is Kathy's score considered better-is it because it is a posituve score? What does the Z…

A: Bobby' Z- score ( wasZ=Bobby's score  of 1080 was between 1 and 2 standard deviation above the mean…

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

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Q: Two samples are randomly selected from a population. One sample has n = 5 and the second has n = 30.…

A: In this case, there are two samples. One sample has size of n = 5 and another has size of n = 30.

Q: Describe when you would use an independent samples t-test versus a dependent samples t-test.

A: In an independent samples t-test, two different groups are investigated and in a dependent samples…

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.