What value of z should be used to calculate a confidence interval with a 95% confidence level?

Q: A random sample of 80 people was selected, and 22 of the selected people indicated that it would be…

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Q: It was observed that 30 of the 100 randomly selected students smoked. Find the confidence interval…

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Q: A June 2020 Angus Reid poll of 1510 Canadian adults found that 53% support the idea of a 30 hour…

A: Given Data: p^=0.53n=1510   z-value corresponding to 95% Confidence level=1.96

Q: In a random sample of 100 men in the United States, 55 of them were married. Using a 95% confidence…

A: We have given that,  Sample size (n) = 100 and favorable cases (X) = 55  Then,  We will find the 95…

Q: A sample survey finds that 30% of a sample of 880 Ohio adults said good health was the thing they…

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Q: The following data were collected in a clinical trial to compare a new drug to a placebo for its…

A: Hello. Since your question has multiple parts, we will solve first question for you. If you want…

Q: Campus athletics is interested in the proportion of registered students living on campus who play…

A: We are given that 95% confidence interval is correctly calculated from the given data as (0.12,…

Q: A November 2018 CBS News Poll found that 35% of its sample planned to use online retailers for most…

A: Given that, A November 2018 CBS News Poll found that 35% of its sample planned to use online…

Q: he drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that…

A: a).

Q: In a survey of 950 randomly selected individuals, 17% answered yes to the question "Do you think the…

A: Sample size, n = 950Probability = 17% = 0.17 90% confidence level

Q: To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random.…

A: we wants to bulid the 97 % confidence interval to check the efficacy of a new cholesterol -lowering…

Q: In a recent questionnaire about home ownership, a random sample of 545 homeowners were asked about…

A: A random sample of 545 homeowners were asked about the rate of mortgage, whether that is fixed or…

Q: In a Gallup Poll of 1005 individuals, 452 thought they were better off financially than a year ago.…

A: Given; p=452n=1005 95% confidence interval is given by- p^±z×p^(1-p^)n true proportion is given as-…

Q: In a random sample of 850 consumers. 385 reported that they were able to purchase a Playstation 5.…

A: According to the given information, we have In a random sample of 850 consumers. 385 reported that…

Q: In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that…

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Q: Gallup is a company that carries out daily opinion polls on a variety of topics. In a recent daily…

A: The confidence interval can be found by using the formula p±zp(1-p)n

Q: A &B

A: The provided data mentions the value of sample size, n is 928 and the value of x is 128. The…

Q: Researchers at Carleton University in Canada studied a random sample of 10 first-year students who…

A: Given Data : For Sample 1 x̄1 = 2.46 n1= 10 s1= 3.26 For Sample 2…

Q: to judge the effectiveness of an advertising campaign for a certain brand of pretzel, a company…

A: There are two independent samples which are before and after the ad campaign. We have to construct…

Q: An independent-measures research study uses a total of 18 participants to compare two treatment…

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Q: Using the accompanying colleges and universities data to find 95% confidence intervals for the…

A: Given:   Liberal Arts Colleges Research Universities 1169 1117 1194 1133 1204 1148 1210…

Q: In a recent survey of US adults, 35 people were asked the question:   “Do you own a smart phone?”.…

A: Given data,n=35x=29Sample proportion p=xn=2935=0.83z-value at 90% confidence is Zc=1.645

Q: A random sample of enrollments from medical schools that specialize in research and from those that…

A: Given,   Group 1 Group 2   593.59 482.81 mean 160.70 181.23 std. dev. 17 16 n

Q: A survey of 620620 men shoppers found that 1111% of them shop on impulse. What is the 9595%…

A: Given,sample size(n)=620sample proportion(p^)=0.111-p^=1-0.11=0.89α=1-0.95=0.05α2=0.025Z0.025=1.96…

Q: b. In a random sample, 165 of 500 persons given a flu vaccine experienced some discomfort. i.…

A: Given that  Sample size n =500 Favorable cases x =165 Sample proportion p^=x/n  =165/500 =0.33

Q: Using p′=0.167, q′=0.833, and n=180, what is the 95% confidence interval for the proportion of the…

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Q: A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence…

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Q: A random sample of 80 University of Missouri sophomores showed that 36 were planning to live…

A: From the provided information, Sample size (n) = 80 From which 36 were planning to live off campus…

Q: The following are airborne times (in minutes) for 10 randomly selected flights from San Francisco to…

A: Determine the mean and standard deviation:   Mean=∑xn=270110=270.1 s=∑x-μ2(n-1)=782.9(10-1)=9.3268…

Q: A survey of 800 women shoppers found that 17% of them shop on impulse What is the 98% confidence…

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Q: Would you guess that people tend to buy more jeans when the weather is warm or when it is cold? The…

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Q: In an articie in the Journal of Advertising, Weinberger and Spotts compare the use of humor in…

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Q: A random sample of 100 people from Country S had 15 people with blue eyes. A separate random sample…

A: The provided information are:

Q: A random sample of students at a college shows that 54 of 200 students had part-time jobs. Which of…

A: It is given that x is 54 and n is 200.

Q: In a survey funded by the UW school of medicine, 750 of 1000 adult Seattle residents said they did…

A: Find z-critical value:…

Q: In the context of the previous problem, construct a 99% confidence interval estimate of the mean red…

A: Given information Sample size n = 50 Sample mean = 4.63 Population standard deviation = 0.54…

Q: In a poll conducted, 439 of 1007 adults in a certain country polled said they were "picky eaters."…

A: a. The proportion of the respondents said they were picky eaters is, p^=xn=4391007=0.4359≈0.44 Thus,…

Q: 1) In a four-year psychedelic-mushroom experiment, 93 of the 300 subjects reported experiencing…

A: It is given that:

Q: A poll commissioned by the Center on Addiction and Substance Abuse at Columbia University found that…

A: Given that, X = 1340 N = 2000 98% confidence level

Q: In a recent questionnaire about homeownership, a random sample of 545 homeowners were asked about…

A:

Q: From a random sample of 100 women, 15 have dangerous reading blood sugar levels higher than 300…

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Q: In a recent survey of US adults, 50 people were asked the question:   “Do you use a ride sharing…

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Q: 11th - It was observed that 30 out of 100 randomly selected students smoked. Estimate the 95%…

A: we associate with the interval estimate is called confidence interval. This probability indicates…

Q: The table below shows the number of car wrecks that occur during certain times of the day: Time 12 -…

A: Part (A) The 95% confidence interval for proportion of wrecks is given by the formula: Find the…

Q: In a recent poll, 19% of respondents answered option A. The margin of sampling error was plus or…

A: Given information- The percentage of the population answered A is, p = 19% The margin of error, E…

Q: The data below were collected in a clinical trial to compare a new drug to a placebo for its…

A: Given that :   New Drug Placebo Total Sample   (n=75) (n=75) (n=150) Mean (SD) Total Serum…

Q: A survey of a random sample of 256 college students found that 36% said they frequently experience…

A: For a known sample proportion, we want an interval to be estimated, which will include the true…

Q: A random sample of 80 people was selected, and 22 of the selected people indicated that it would be…

A: Given information: Sample size n=80 Number of selected people who indicated that it would be a good…

Q: The following data were collected in a clinical trial to compare a new drug to a placebo for its…

A: For New drug, -> n = 75 -> Mean serum cholesterol = 182 -> Proportion of Patients with…

Q: 95% confidence interval for the proportion of college students who have texted during class was…

A: Given that  95% confidence interval=(0.75 , 0.95)

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.