A quality control specialist wants to estimate the percentage of defective batteries within 5% from the true value, at the 90% confidence level. How many batteries should be randomly sampled? Round your answer up to a whole number.

Q: The confidence interval was (52, 62) What was the point estimate? What was the margin of error?…

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Q: In a survey, the planning value for the population proportion is  p* = 0.33.  How large a sample…

A: It is given that the population proportion is 0.33.It is known that the critical value for 95%…

Q: given certain level of significance, what is the relationship between the confidence interval and…

A: Margin of error: Margin of error is a range of values that lie above and below the sample statistic…

Q: Why does increasing the confidence level result in a larger margin of error?

A: We know that the Margin of error is directly proportional to the test statistic's critical value,…

Q: Explain when you would use the paired-samples procedure to make confidence intervals  and test…

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Q: Decreasing the sample size, while holding the confidence level the same, will do what to the length…

A: Introduction: Confidence interval is the interval estimate of the population parameter. It is the…

Q: Determine the margin of error for the confidence interval for the proportion: 0.509<p<0.845 The…

A: The given confidence interval is about population mean. We have to find the margin of error. Margin…

Q: What is the role of the sample size in the determination of confidence interval? Explain.

A: Let us first define sample size and confidence interval. Sample size: It is determination of the…

Q: In a survey, the planning value for the population proportion is p*=0.25 . How large a sample should…

A: Sample size: The sample size for a desired confidence level, α with a given margin of error, E is…

Q: In a survey, the planning value for the population proportion is .25. How large a sample should be…

A: Solution: It is given that the planning value for the population proportion is 0.25. The confidence…

Q: For the same sample statistics, which level of confidence would produce the widest confidence…

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Q: We would like to know: "What percentage of college students drink alcohol every day?" In a random…

A: Given that, N=500 X=75

Q: A poll of 350 people is taken and the confidence level is 90%. What is the margin of error (MOE)?…

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Q: We would like to know: "What percentage of college students read the college newspaper every day?"…

A: It is provided that there is random sample of 500 college students in which 231 students said that…

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large sample should…

A: Given information Error = 0.09 Population proportion = 0.25 Confidence level = 0.95

Q: how many people should you sample? 4 80 125 382 383

A: Given : Margin of error: ME = 0.05

Q: Given certain level of significance, what is the relationship between the confidence interval and…

A: We want to know that relationship between confidence interval sand sample size.

Q: Is the difference between the two indicators significant at the 95% confidence level?

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Q: A researcher would like to know the proportion of the households that has a cable subscription. She…

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Q: A poll asked 800 people their choice for mayor. What is the approximate margin of error for a 95%…

A: Given: P=0.5 q=0.5 z-critical value for 95% confidence interval is 1.96. The approximate margin of…

Q: In a survey, the planning value for the population proportion is p* =0.25 . How large a sample…

A: Given: p* = 0.25α=0.05MOE=0.09

Q: Professor Smith loves dark chocolate, and she would like to find out the proportion of the…

A: Given Information: Sample size (n) = 850 Out of which x = 600 people chose dark chocolate.…

Q: In order to make the decision for one business, your team constructed a 90% confidence interval, the…

A: For 90% confidence interval, the width of that confidence interval is 500.We have to reduce the…

Q: A quality controller wants to estimate the proportion of high quaity goods out of a batch of…

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Q: In a survey, the planning value for the population proportion is p* = 0.25. How large a sample…

A:

Q: What is the relationship between α and the confidence level of a hypothesis test?

A: In hypothesis testing, α is the level of significance, which provides details about the chance of…

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: Given information Error = 3% = 0.03 Confidence level = 0.95

Q: In general, when you increase the confidence level for a confidence interval using the same sample…

A: As confidence level increases critical value is going to increase .  Here they given sample…

Q: The confidence interval was (77, 83) What was the point estimate? What was the margin of error?

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Q: In a survey, the planning value for the population proportion is .25. How large a sample should be…

A: We have to find sample size..

Q: Determine the margin of error for the confidence interval for the proportion: 0.575 <p<0.722

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Q: Why is a 99% confidence interval wider than a 95% confidence interval?

A: The confidence interval formula is sample statistic±Margin of error. The margin of error is the…

Q: What is z* for a 92% confidence level?

A: To find value of Z* for a 92% confidence level ??

Q: Suppose we would like to estimate the proportion of all NBA fans who thought Aaron Gordon won the…

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Q: (a) What is the meaning of a confidence interval? (b) For a given set of measurements, will the 95%…

A: Confidence Interval can be expressed as a range of values, where it is likely for our true value of…

Q: What Z score would be used to construct a 90% confidence level? Is it ... a. 1.65 b. 2.33 c.…

A: Confidence Level = 90 Significance Level = α = (100-90)% = 0.1 Critical value = z* = 1.65   […

Q: Angela is trying to figure out the sample size for the data set she wants to collect. She is…

A: The larger the sample size, the less will be the value of standard error. Therefore, the range of…

Q: Find the confidence level and a for an 88% confidence interval.

A: Here use confidence level and significance level as alternative of each other

Q: If about 75% of the students of a certain university are expected to use a laptop for online…

A: Given,sample proportion (p^)=0.75margin of error(E)=0.05α=1-0.99=0.01α2=0.005Z0.005=2.5758…

Q: Determine the margin of error for the confidence interval for the proportion: 0.518 <p<0.774 The…

A: We have to find margin of error

Q: Given a sample mean 59.86 and a margin of error 2.77, what is the left boundary of the confidence…

A: The sample mean is 59.86 and the margin of error is 2.77.

Q: The confidence interval was (64, 76) What was the point estimate? What was the margin of error?

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Q: Consider a Tukey multiple comparison of four population means with a family confidence level of…

A: Family confidence level: The family confidence level is the confidence that the all confidence…

Q: identify the population proportion, the value of margin of error E, and construct the confidence…

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Q: Michelle, a student studying music, randomly sampled fellow music majors and asked whether they…

A: Given information- Confidence interval = (0.09, 0.26) We have to find margin of error. We know that-…

Q: What is the relationship between confidence intervals and hypothesis tests?

A: Confidence Interval:Confidence interval is the interval estimate of the population parameter. It is…

Q: Aston’s Career Service wants to find out what proportion of Aston’s students work in a part-time…

A: From the given information, Population proportion = p = 60% = 0.60 Margin of error = E = 4% = 0.04…

Q: Find the margin of error for the given confidence level and values of x and n. x = 111, n = 194,…

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Q: what is the confidence coefficient of the following confidence levels? 99% Confident? 90%…

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Q: For what type of variable does it make sense to construct a confidence interval about a population​…

A: Qualitative variable: A variable which cannot be measured in numerically is known as a Qualitative…

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.