What sample size should the flower shop take?

Q: Isabel Myers was a pioneer in the study of personality types. According to one of her surveys, in a…

A: Solution

Q: Suppose the NCES would like to re-do their study. If they want a 95% confidence interval with a…

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Q: A manager needs to know the proportion of employees who have insurance. He selects 200 employees and…

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Q: find the sample size needed to estimate the percentage of democrats who have tattoos. Use a 0.05…

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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: A researcher wants to estimate the proportion of electric car owners in Los Angeles County. The…

A: According to the given information, we havePopulation proportion, p = 10% = 0.10Margin of error, E =…

Q: A 20-minute consumer survey mailed to 500 adults aged 25 to 34 included a $5 Starbucks gift…

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Q: adults in a recent​ year, 742 made a New​ Year's resolution to eat healthier.   Construct​ 90% and​…

A: The value of z at a 90% confidence level is 1.645, which can be found by using the standard normal…

Q: Suppose we take a survey of 200 students and ask how much they study per week. The result is an…

A: From the above data  We are given that the  95% confidence interval is (10, 10.5). The population…

Q: A sample of 80 respondents was taken to determine whether the clients of an internet provider are…

A: Given that  Sample size (n) = 80 Respondents satisfied with the service (x) = 60 Sample proportion…

Q: cream truck driver randomly sampled people that purchased ice cream on a Friday night. He wanted to…

A: Proportion=p^=0.56 , Margin of error=E=0.12

Q: Out of 200 people sampled, 42 had kids. Based on this, construct a 95% confidence interval for the…

A: For 95% confidence intervalα=1-CI=1-0.95=0.05So, zα2=z0.052=z0.025=1.96

Q: Suppose I wanted to know the proportion of students who are paying attention in class, so I give a…

A: Confidence Interval for Proportion A confidence interval is a statistical method that denotes a…

Q: In a survey of 2004 adults in a recent​ year, 717 made a New​ Year's resolution to eat healthier.…

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Q: A poll of 827 students at Alpha state college found that 61% of those polled preferred a quarter…

A: It is given that the proportion of the students who preferred a quarter system to a trimester…

Q: A researcher wanted to check whether the percentage of Canadian adults with obesity has decreased in…

A: Number of Canadian adults in 2005= 75 Number of Canadian adults in 2009 = 120   significance level =…

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

A: Confidence interval:

Q: Jane

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Q: What is the t-value for a 95% confidence interval given that the sample size is 16? Write the exact…

A: Given: confidence level =95%  Sample size n=16  Then degree of freedom for t-test is =n-1  To find…

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: We want to estimate the proportion of vegetarian restaurants in a country. We observe 20 such…

A: We observe 20 such restaurants out of 100 p⏞ =xn=20100=0.5 90% confidence interval for the…

Q: We wish to estimate what percent of adult residents in a certain county are parents. Out of 500…

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Q: Jane wants to estimate the proportion of 13 students on her campus 4 who eat cauliflower. After…

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Q: in a survey of 2042 adults in a recent​ year, 715 made a New​ Year's resolution to eat healthier.…

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Q: If n=590 and p=0.93, construct a 90% confidence interval.

A: Express the expression for the confidence interval. C.I=p±Z*p(1-p)n Here, Z* is the critical value .…

Q: What should your sample size be if you want a confidence level of 90 percent and a margin of error…

A: We want to find the sample size (n)

Q: Out of 300 people sampled, 171 had kids. Based on this, construct a 95% confidence interval for the…

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Q: Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a…

A: It is given that Margin of error E = 0.04 Confidence level = 95% The critical value of Z at 95%…

Q: business conducts a random sample of 89 of its customers and find that 44 of them think the company…

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Q: We plan to sample students to construct a 98% confidence interval for the proportion who uses Yelp…

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Q: Find the margin of error that corresponds to a sample of size 210 with 70% successes at a confidence…

A: Sample size is 210. Percentage of successes is 70%. Percentage of confidence level is 90%.

Q: Cough and Headache At the 98% confidence level, should be nurse inform the managers that their…

A: The number of sampled patients that complained of cough and headache, n=230.The number of patients…

Q: Identify the y-score for a 99% confidence interval if the sample size is 35.

A: We have to find critical value for given data..

Q: Leana is interested in the proportion of people who live in her area who own a dog. She randomly…

A: Suppose p is the population proportion of people who live within one mile of Person L’s home who own…

Q: A researcher wanted to compare the percentages of men and women who play the lottery.  They randomly…

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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: Out of 300 people sampled, 279 had kids. Based on this, construct a 90% confidence interval for the…

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

A: The confidence level is 0.95.

Q: If N=480 and p̂ (p-hat) =0.88, find the margin of error at a 95% confidence level.

A: From the provided information, Sample size (n) = 480 p̂ (p-hat) =0.88 Confidence level = 95%

Q: Ve want to know how many people plan on buying a cell phone this year. Determine the sample size…

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Q: For a confidence level of 94%, find the critical value for a confidence interval on a one sample…

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Q: second-semester junior at a large high school wants to estimate the number of colleges a senior…

A: Solution

Q: The local newspaper is conducting a poll about how the residents of the city feel about the traffic…

A: sample size(n)=666x=57confidence level=95%sample proportion()=

Q: After an advertisement campaign of polish, the manufacturers wanted to know how many of the possible…

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