In a sample survey, 138 students failed the exam out of 200 total students.  1. Calculate the 95% confidence interval for the population prportion of students who failed the exam.  2. Compare the margin of errors at 90%, 95%, and 99% confidence intervals. What happens when the confidence interval increases?

Q: 5. In a random sample of 400 college students, 16 had perfect attendance Find the 95% confidence…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

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Q: In a survey of 2304 ​adults, 746 say they believe in UFOs.   Construct a 95% confidence interval for…

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Q: You are given the sample mean and the population standard deviation. Use this information to…

A: We have given that , Mean = 145 , SD = 18.8 , Sampl size = 55 , We have to find, 90% of Confidence…

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A: Construct 90% Confidence interval for population proportion p

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A: 1) Given Data :  We will calculate the point estimate which will be the mean of this sample data,…

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A: The data shows 32 workers ages 16 years and over who did not work from home and asked how ling it…

Q: Q4. You conduct a poll comparing two candidates. In a poll of 400 people, 190 prefer candidate A,…

A: Here, let πA and πB be the true population proportion of the supported people for A and B candidate…

Q: 14. Direct Mail A survey shows that 51% of adults prefer to receive advertisements through the mail.…

A: Given percent of adults prefer to receive advertisements through the mail=51%Margin of error(E)=5.2%

Q: 1. How is the expected length of a confidence interval related to the margin of error?

A: here use basic of confidence interval

Q: Suppose you calculate a 99% confidence interval to be: 13.05 to 20.75. Determine the margin of error

A: Given data: The given upper limit is b=20.75. The given lower limit is a=13.05.   The expression for…

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A: Given sample is : 10 25 11 16 20 27 10 24 14 28 Sample size n = 10 sample mean = 185/10 = 18.5…

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Q: 13. This summer, when I was doing gardening, I got some seeds. The packet with seeds said that 95%…

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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: Calculate the mean and standard deviation for the two sets of data. Calculate the 95% confidence…

A: Mean and standard deviation for dataset A: Mean x¯=∑i=1nXin=70.24+70.22+70.103=210.563=70.1867…

Q: A &B

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Q: Use the confidence interval to find the margin of error and the sample mean. (0.072,0.210) The…

A: Given Confidence of interval (0.072,0.210)

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A: What is confidence interval and explain it to non statistics person.

Q: Which of the following decreases the margin of error for a confidence interval? Decreasing the…

A: given data we want to decrease margin of error for a confidence interval.

Q: Suppose you calculate a 95% confidence interval for a proportion to to be: 0.39 to 0.78. Determine…

A: Given,   Lower bound = 0.39​ Upper bound = 0.78   Here, we use to determine the margin of error.

Q: Frum Data Set VI in Appendix B. select a sample of 20 values and find the 90% confidence interval of…

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Q: /hat is the 95% confidence interval for this sample mean? to 82.0 to 67.4 to 82.9 to 67.6

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Q: Determine whether the statement below makes sense or does not make sense. Explain clearly.

A: Here given , Based on our sample, the 95% confidence interval for the mean amount of television…

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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.

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A: From the provided information, Sample proportion (p̂) = 0.24 Margin of error for a 95% confidence…

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Q: According to a telephone survey of adults, 86% of homeowners said that owning a home was a good…

A: From the given information, According to a telephone survey of adults, 86% of homeowners said that…

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A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

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A: From the provided information, Sample size (n) = 36 Sample mean (x̅) = 54 Population standard…

Q: You observe 40 customers at a coffee shop, and 77% of them tip. What is the 95% confidence interval…

A: p=0.77 n=400

Q: A professor is interested in how attendance influences her class. She goes through her records and…

A: 1. The recorded data is,

Q: Get an education: In 2012 the General Social Survey asked 844 adults how many years of education…

A: From the provided information, Sample size (n) = 844 Sample mean (x̄) = 8.54 Standard deviation (s)…

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

A: Given; x=561n=935The level of significance is;α=1-0.95=0.05 (a) The best point estimate of the…