7.What value of z would you use to calculate the 98% confidence interval for a population mean, given that you know the population standard deviation, the sample size and the sample mean of your sample? a) z = 1.96 b) z=2.58 c) z= 1.28 d) z = 2.33

Q: 4. A teacher noted that the mean scores of a random sample of 15 grade 8 students who had taken a…

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Q: 3, Interpret the statement, "I am 95% confident that the Determine the value of z, that would be…

A: Provided statement is “I am 95% confident that the interval estimate contains µ” Interval is…

Q: (b) Estimate the sample size needed if no estimate of p is available. A sample of elementary school…

A: From the provided information, Confidence level = 95% Margin of error = 0.06

Q: Suppose you wish to estimate the average height of adults using a sample of 20 adults where the mean…

A:

Q: c) Find the sample size necessary for a 95% confidence level with maximal margin of error E = 1.10…

A:

Q: Determine the margin of error for the confidence interval for the mean: 70 <u< 95 The margin of…

A: Margin of error for mean is given by, ME= Z*sigma/√n Lower limit of mean is = x bar - Z*Sigma/√n X…

Q: Find the sample size necessary for a 99% confidence level with maximal margin of error E = 2.00 for…

A: Solution

Q: Determine the margin of error for the confidence interval for the mean: 65<u<92 The margin of error…

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Q: What is the critical value t* for constructing a 95% confidence interval for a mean from a sample…

A: The objective is finding the critical value for constructing a 95% confidence interval for a mean.

Q: The mean and standard deviation of the quality grade-points of a random sample of 36 students from a…

A: Given n=36 xbar=2.6 Standard deviation (Sigma) =0.3

Q: Determine the margin of error for the confidence interval for the mean 68 < u < 85 The margin of…

A:

Q: Determine the margin of error for the confidence interval for the mean: 62<u<88 The margin of error…

A: Given Confidence interval for Mean is 62&lt;μ&lt;88Lower limit = 62Upper limit = 88

Q: 4) A study of 29 female Sumatran elephants provided a 96% confidence t-interval for the mean the…

A: Solution: 4. The standard error of the mean is calculated by using the formula:

Q: (iii) How large would the sample size need to be so that the margin of error for your 95% confidence…

A: Given: Sample size, n = 9           Sample mean, m = 94.619           SAmple variance, s2 = 49.0001…

Q: using the confidence interval method, to test that population mean equals 14, a researcher obtains…

A: Solution: State the hypotheses. Null hypothesis: H0: µ=14. That is, the population mean is equal to…

Q: 1) Given lower and upper limits of the confidence interval for a population mean (84, 120) a)…

A: Given : Lower and upper limits of the confidence interval for a population mean (84,120).  The…

Q: Determine the sample size necessary to construct a 85% confidence interval with an error of 0.07 if…

A: Given,margin of error (E)=0.07sample proportion…

Q: B. Construct a 95% confidence interval estimate of 4-4, the difference between the mean weight of…

A: Given Information: B) 95% confidence interval estimate of difference between the mean weight of…

Q: A t value is to be used in calculating a 99% confidence interval for the population mean μ, based on…

A:

Q: a. How many workers are there in each stratum? b. Estimate the mean forced vital capacity among the…

A: Here population is 1200(i.e. workers employing at a plant). Out of 1200 sample is taken of size 40.…

Q: A simple random sample of 400 individuals provides 100 Yes responses. a. What is the point estimate…

A: It is given that a random survey, 100 responses (x) in “Yes” in a sample of 400 individuals (n).…

Q: What value of tn-1 would be used to construct a 99% confidence interval for the mean with a sample…

A: Givenconfidence level(c)=99%sample size(n)=17

Q: Suppose that you wish to obtain a confidence interval for a population mean. Under the conditions…

A: Given The Pop. sd is unknown. The pop. is normally distributed. The sample size (n) is small.

Q: sports in China and those made in America. shop selects a random sample and records the sales of…

A: (a) The SE for the sales from china is calculated as: SEChina=sn=9.7550=1.379 Hence, the SE Mean for…

Q: 7) The state education commission wants to estimate the proportion of tenth grade students that have…

A:

Q: Let the observed value of the mean of a random sample of size n=20 from a normal distribution with…

A:

Q: 8. Which of the following is not needed in computing the minimum sample size for the estimation of…

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Q: (3) Construct the indicated confidence interval for the difference between the two population means.…

A:

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

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

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Q: Estimate the population mean by finding a 99% confidence interval given a sample of size 9, with a…

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Q: 2) Use the given data to find the minimum sample size required to estimate the population…

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Q: (b) Estimate the sample size needed if no estimate of p is available. A sample of 504 adults is…

A: Given that m.e=0.03,alpha=0.002 ( 2 ) n=?

Q: Use the given confidence interval to find the margin of error and the sample proportion.…

A: Plug in all the values in the formula, we get Therefore,

Q: 2. A marketing officer wishes to select 300 female receptionists from a group of employees. The…

A: We can estimate the true population mean by using the confidence interval for mean.A…

Q: For the sample data set: (0,0) (2,3) (3,3) (6,4) (9,8) a. Give a point estimate for the mean value…

A: The given data set is (0, 0), (2, 3), (3, 3), (6, 4), and (9, 8).

Q: 2.The administration at a college wishes to estimate, the proportion of all its entering freshmen…

A: Given;margin of error(E) = 4population standard deviation(σ)= 1.3for confidence level 95%,…

Q: 4. A teacher noted that the mean scores of a random sample of 15 grade 8 students who had taken a…

A:

Q: 4. The mean and standard deviation of n measurements randomly sampled from a normally distributed…

A:

Q: 2. Construct a 90%, 95%, and 99% confidence interval of the mean weight of fresh oranges if 100…

A: Given : Mean , μ = 180 gm Standard deviation, σ = 30 gm sample size, n = 100 a) Confidence Level =…

Q: What value of z would you use to calculate the 98% confidence interval for a population mean, given…

A:

Q: 14. Find the sample size that will produce the maximum error of a 99% confidence interval for a…

A:

Q: Suppose 10 Texas counties are randomly selected to study the average percent of residents who are…

A:

Q: 11. ( Assume that population means are to be estimated from the samples described. Sample size = 81,…

A:

Q: Which of the following terms is added and subtracted to the sample mean ir order to obtain a 90%…

A: Solution

Q: 9. Find the minimum sample size needed to be within a margin of error of 2% of the population…

A:

Q: Compute a 95% confidence interval for the true population mean given the following  10 data that…

A: Given, Sample size = 10 Sample mean = 15.3 Sample standard deviation = 3.5   Since the population…

Q: 6) According to the International Journal of Retail and Distribution Management (Vol. 39, 2011)…

A: The variable is number of hours spent shopping on Black Friday. We have to find out the sample size…

Q: 2. Estimate the proportion of WCU students who have type B blood using 95% confidence interval.…

A: Given , n=100x=24p^=xn=24100=0.241-p^=1-0.24=0.76α=1-0.95=0.05α2=0.025Z0.025=1.96

Q: For the specified margin of​ error, confidence​ level, and educated guess for the observed​ value,…

A: Zα/2 = 1.645  at α = 0.1 _____________________________ Use Excel function =NORMSINV(0.05) OR Z-…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.