You want to make a 90% confidence interval for a population proportion with an error term no bigger than 0.02. If you have no other information, what is the smallest sample size that guarantees this?

Q: What is the critical t-value (found in the t-table) if you are making a 90% confidence interval with…

A: Confidence level=90%Sample size(n)=20

Q: Give the endpoints of the 90% confidence interval for the true population proportion of fruit flies…

A: Sample size is given by n = 500 And number of flies with gene, X = 200 At 90% confidence level, the…

Q: ference between two proportions. Find the sample size needed for a margin of ror of 0.2 if you do…

A: Given For 95% confidence interval, z value=1.96 Margin of Error =0.2

Q: You intend to estimate a population mean with a confidence interval. You believe the population to…

A: Sample size (n) = 63 Degree of freedom = n – 1 = 63 – 1 = 62 Confidence level = 81.2% Level of…

Q: If n=31, ¯xx¯(x-bar)=30, and s=7, find the margin of error at a 90% confidence level Give your…

A: Given,n=31x¯=30s=7degrees of freedom (df)=n-1df=31-1=30α=1-0.90=0.1α2=0.05t0.05(30)=1.697…

Q: For the same sample proportion and sample size, what happens to the width of a confidence interval…

A: Solution-: For the same sample proportion and sample size, what happens to the width of a confidence…

Q: Other than the typical 90%, 95% and 99% confidence intervals, we may want to work with any other…

A: Note: This critical value calculated from standard normal distribution table at level of…

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: You have a sample of 9 men and a sample of 8 women. The degrees of freedom for the t value in your…

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Q: Part A: Make a 90% confidence interval for given that you have a sample of size 49 which produced a…

A: Given,margin of error(E)=0.2standard error(σ)=3.2α=1-0.90=0.10α2=0.05Z0.05=1.645      (from Z-table)

Q: If n=13, x(x-bar)=30, and s=9, find the margin of error at a 99% confidence level Give your answer…

A: Given,n=13x=30s=9α=1-0.99=0.01α2=0.005degrees of freedom(df)=n-1=13-1=12t0.005(12)=3.055

Q: If n=24, x(x-bar)=33, and s=3, find the margin of error at a 90% confidence level Give your answer…

A: It is given that standard deviation (s) is 3 and sample size (n) is 24.

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: If n=28, ā(x-bar)=39, and s=3, find the margin of error at a 80% confidence level Give your answer…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: he lower end of the 95% confidence interval is Question Blank 1 of 2and the higher end of the 95%…

A: n=8 Sample sizex= 9.8 Sample mean s= 0.4 Sample standard deviation

Q: How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95%…

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Q: You are trying to calculate a confidence interval to estimate a population mean. After performing…

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Q: A sample of 700 from population A has a proportion of interest of 0.24 while a sample of 600 from…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: If n=31, ē(x-bar)=35, and s=5, find the margin of error at a 99% confidence level Give your answer…

A: We have to find margin of error.

Q: You are interested in studying whether students living in the dorms or students living off campus…

A: given information : n1=35,n2=50m1=5.7, m2=6.3s1=1.4 ,s2=1.3 for obtain 99% confidence interval first…

Q: Suppose that you are in charge to see if dropping a computer will damage it. You want to find the…

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Q: Is this correct or incorrect? Why?

A: Here use basic of confidence interval

Q: If n=27, (x-bar)=46, and s=2, find the margin of error at a 98% confidence level Give your answer to…

A: Given : n = 27 x¯ = 46 s = 2 Confidence level = 98% = 0.98

Q: The definition of a 90% confidence interval is that we expect that close to 90% of a large number of…

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Q: If n=21, x(x-bar)=47, and s=5, find the margin of error at a 98% confidence level Give your answer…

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Q: If n-20, -40, and s-7, find the margin of error at a 80% confidence level Give your answer to three…

A: given data  n = 20 x¯ = 40s = 780% ciE = ?

Q: You are going to construct a 99% confidence interval for the proportion of hip replacement…

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Q: The police department wants to reduce the margin of error for their 95% confidence interval. If they…

A: Here Given  The police department wants to reduce the margin of error for their 95% confidence…

Q: You plan to build a 95% confidence interval estimate of the mean of a large population. You want a…

A: Givenconfidence level=95%Margin of error(E)=10standard deviation(σ)=200

Q: If n = 440 and p = 0.52, construct a 90% confidence interval. %3D Give your answers to three…

A: Given information- Sample size, n = 440 Confidence level, c = 0.90 So, significance level (α) = 0.1…

Q: a sample of 25 automobiles shows that the mean price was $20,500 with standard deviation of $2,500.…

A: Givensample size = n = 25Mean price = $20,500Standard deviation = $2500 The distribution is normal.…

Q: We calculate a confidence interval. Then we gather additional data and find a new confidence…

A: The margin of error can be calculated as: E=z×σn  Here,  z= confidence level n = Sample size σ =…

Q: What is the effect on a confidence interval if one decreases both sample size and the level of…

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Q: If n=19, (x-bar)=34, and s-10, find the margin of error at a 99% confidence level Give your sprior…

A: Given that  n=19, (x-bar)=34, and s=10, confidence level = 99%

Q: If n=19, a(x-bar)=31, and s=9, find the margin of error at a 80% confidence level Give your answer…

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Q: Come up with  your own data for a problem that would ask for a 90% confidence interval utilizing Z.…

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Q: You want to estimate the difference between two population proportions using an 80% confidence…

A: Given the maximum width of the confidence interval is 5.0% and two samples (one from each…

Q: Suppose you compute a confidence interval with a sample size of 25. What will happen to the…

A: See the handwritten solution

Q: If n = 20, the sample mean = 250, SD = 15, SEM = 3.354, what is the confidence interval (using 95%…

A: The formula for a confidence interval for the population mean μ\mu when the population standard…