A study is to be performed to determine a certain parameter in a community. From a previous study a sd of 46 was obtained. If a sample error of up to 4 is to be accepted. How many subjects should be included in this study at 99% level of confidence?

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A: At 95% confidence level, the z value is 1.96 which can be obtained by using the standard normal…

Q: Suppose that you take 1000 simple random samples from a population and​ that, for each​ sample, you…

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Q: In a sample of 30 participants, a researcher estimates the 95% CI for a sample with a mean of Μ1-Μ2…

A: From the given questionSample size (n) =30, mean difference (M1-M2) =0.7 and standard error…

Q: a) Find a 99% confidence interval for the population mean price (per 100 pounds) that farmers in…

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A: Formulae to find x¯ and s from confidence interval is as follows ,    x¯ = Lower limit +Upper limit…

Q: If we want a 95% confidence interval for proportion within 3% how large a sample do we need?

A: It is given that margin of error (E) is 0.03 and the confidence level is 0.95.

Q: The 95 % confidence interval for the mean lead content per litre of waste water produced by her…

A: It is given that Sample size n = 500 Sample mean M = 641 Population SD = 20 The critical value of Z…

Q: A sample of size 85 from a population having standard deviation o = 45 produced a mean of 254.00.…

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Q: If you wish to estimate a population mean with a sampling distribution error SE = 0.28 using a 95%…

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Q: Please answer e-h

A: (a): in regression analysis we use t test for hypothesis testing so here the value of test…

Q: We want to estimate a population proportion with a 95% confidence interval and we want the margin of…

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Q: Suppose that the sample size had been​ 240, with x bar=4.1 and s=3.1. Use technology to find a​ 95%…

A: Sample mean = x̅ = 4.1 Sample size = n = 240 Sample S.D = s = 3.1 Standard Error = s/√n  =…

Q: A statistical research yields to the sample proportion of a certain feature in a certain community…

A: Givensample proportion(p^)=0.80Margin of error(E)=0.09Confidence level(α)=90%

Q: A confidence interval for the difference between the means of two normally distributed populations…

A: Confidence interval is an inference process which gives the change of plausible values of population…

Q: Find the critical value z(a/2) that corresponds to the confidence level 91%

A: Find the critical value z(a/2) that corresponds to the confidence level 91%

Q: Suppose that you take 500 simple random samples from a population and that, for each sample, you…

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Q: Given a sample size of 400 with a mean of 80 and the population standard deviation is found to be 35…

A: We have given that,  Sample mean (x̄) = 80, population standard deviation (σ) = 35 and sample size…

Q: ) The parameter of interest is       ["", "", "", ""]  b) The value of the population mean is…

A: here given, A company that produces white bread is concerned about the distribution of the amount of…

Q: For a confidence level of 80% with a sample size of 32, find the critical t value.

A: Given that n =32, alpha =0.2

Q: If a 95% confidence interval for the difference in two independent means is (-4.5 to 2.1), then the…

A: Point estimate= (-4.5+2.1/2) Point estimate=-2.4/2 Point estimate= -1.2

Q: Use the given data to find the minimum sample size required to estimate the population proportion.…

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Q: A random sample of 12 hollyhock plants grown from the seed in a particular packet was taken, and the…

A: Given Data: n=12    ∑x=28.43              ∑x2=88.4704   Mean=∑xn=28.4312=2.369…

Q: If you were constructing a 95% confidence interval of the population mean based on a sample of n =…

A: Obtain the critical value of t. The critical value of t is obtained below: Obtain the degrees of…

Q: If n = 15, ¯x = 50, and s = 9, construct a confidence interval at a 90% confidence level. Assume the…

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Q: 1. Dr. Edgar Anderson was a botanist who collected vast amounts of data for several species of wild…

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

Q: Find the minimum sample size you should use to assure that your estimate of p will be within a…

A: We have to find sample size required.

Q: Suppose we created a 90% confidence interval for B1, and wanted to use it to determine if the linear…

A: If confidence interval contains 0, then we fail to reject the Null.    Hence, only first interval…

Q: a sample of n=16 scores has mean of M=58 with SS=540. Use the sample to construct the 95% confidence…

A: Solution: From the given information, n=16, M=58 and SS=540.

Q: A sample of size 26 has a sample variance of 100. Then a 90% Confidence Interval for o? is < o? <

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Q: A sample of size 16 was taken from a very large population. Sample statistics, x¯ and s, were used…

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Q: If we want a 96% confidence interval on population mean with a sample size of 23, find zα2 or tα2

A: It is given that the confidence level is 96%.

Q: A símple random sample of size 100 has mean 15, the population variance being 25. Find an interval…

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Q: An interval estimate with a 99% confidence means that there is 0.99 probability that the population…

A: We have to interpret the confidence interval.

Q: the given data beloW, form a 95 % confidence interval for the difference between the population mean…

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Q: When we regress a variable Y on another variable X, which of the following will NOT lead to a wider…

A: Here use formula of confidence interval of slope coefficient

Q: we want a 96% confidence interval on population mean with a sample size of 23, find z o

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Q: For a population data set sigma = 12.7 How large a sample should be selected so that the margin of…

A: Given that standard deviation (σ)=12.7Margin of Error (E)=3.20confidence level=0.96

Q: Given that you need to construct a 90% confidence interval, having 12 measurements, and you don't…

A: The confidence level is c = 0.90.

Q: If n = 23, ¯x = 35, and s = 3, construct a confidence interval at a 95% confidence level. Assume the…

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Q: A random sample of student applicants who took the college entrance test is desired to be known. The…

A: From the provided information, Population variance (σ2) = 27.4

Q: suppose that you take 1000 simple random samples from a population and that, for each sample, you…

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Q: A random sample of 500 observations yields x̅ =400 and s=50. What is the  95% confidence interval…

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Q: Based upon the results of the sample in #1, can you say with 95% confidence that your confidence…

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Q: Find a 90% confidence interval for the mean if a sample of size 12 has a mean = 34.2 and the…

A: The sample size is 12, sample mean is 34.2, and sample standard deviation is 8.5. The degrees of…

Q: How many people should I poll to guarantee the actual error on pN is less than e with 90%…

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Q: Question 4 The Department of Energy wants to determine the percentage of mining firms that follow…

A: Given data, n=250 x=95   sample proportion p=x/n =95/250 =0.38   z-value at 99% confidence is…

Q: (a) Assume that the hay fever rate in each age group has an approximately normal distribution. Do…

A: Hay fever A random sample of n1=16 communities in westerns Kansas gave the following information…

Q: If you wish to estimate a population mean with a sampling distribution error SE = 0.21 using a 95%…

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Q: A random sample of 130 observations produced a mean of T = 23.5 and a standard deviations = 2.16.…

A: Given:   Sample size  n          =  130       mean  x¯               =  23.5 Standard deviation s  =…