The EPA wants to test a randomly selected sample of n water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the EPA wants a 95% confidence interval with a bound of error of 2 milligram per liter (mg/L), how many water specimens are required in the sample? Assume prior knowledge indicates that pollution readings in water samples taken during a day have been approximately normally distributed with a standard deviation of 5.3 (mg/L).

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

A:

Q: 2. A study of recent graduates from your school reveals that for a accounting majors the mean salary…

A: Given that  Sample sizes n1=20 , n2=18 Sample mean s x1=30000 , x2=29000 s1=2000 , s2=1500

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Q: (a) Does a two-sided hypothesis test with size a = 0.01 accept or reject the null hypothesis that…

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Q: 10. The average salary of college graduates who have taken a statisti distributed with a population…

A: Given that: n= 36.0 , x̄= 45600.0 s= 6000.0 At 95.0 % confidence level , z score= 1.96 So, 95.0 %…

Q: In a sample of n=19 lichen​ specimens, the researchers found the mean and standard deviation of the…

A: We have to find out sample size

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A: Given that, Critical value: Using the z-table, the critical value at 95% confidence level is,

Q: A sample of 51 recent graduates from a specific program yielded an average starting salary of…

A: From the provided information, Sample size (n) = 51 Sample mean (x̅) = $38500 Sample standard…

Q: 2. A researcher wants to test if the mean GPAS (grade point averages) of all male and all female…

A: Comment: As per the our company guidelines we are supposed to answer only one question. Kindly…

Q: The EPA wants to test a randomly selected sample of nn water specimens and estimate the mean daily…

A: From the provided information, Population standard deviation (σ) = 4 Margin of error (E) = 1…

Q: Suppose that Susie is an analyst for the bicycling industry and wants to estimate the asking price…

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Q: Assume that six samples of pesticide concentrations in Ohio plants are gathered, yielding  a sample…

A: Given, S = 4.3x¯ = 28.2n = 6     To find, a) 50% confidence interval for mean? b) Interpretation c)…

Q: 3) A factory produces batteries that have a lifetime that is approximately normally distributed with…

A: In question, We have given the population standard deviation of 40 hours and sample of 30 batteries…

Q: In a study of the lifetimes of electronic components, a random sample of 400 components are tested…

A: Note: Hey, since multiple subparts are posted, we will answer first three subparts according to our…

Q: 2. A marketing research company desires to know the mean consumption of milk per week among males…

A: Solution (2) The provided information are: Margin of error (E) = = 0.08 Confidence level = 80%…

Q: Suppose a random sample of 32 canned products are inspected and an average of 7 of them are reported…

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Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

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Q: The bottlers of a new fruit juice daily select a random sample of 12 bottles of the drink to…

A: Given information: The sample size is 12. Sample mean is 12.03. Population standard deviation is…

Q: 13. How large a sample should be selected so that the maximum error of estimate for a 95% confidence…

A: Given thatMargin of error (E)  = 0.048Significance level (α) = 1 - 0.95 = 0.05population percentage…

Q: 3) An electrical company manufactures a plastic connector module that have depths that is…

A: Given,sample size(n)=75mean(x¯)=0.310standard deviation(σ)=0.0015α=1-0.95=0.05α2=0.025Z0.025=1.96…

Q: 1. The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: . Find the 99% confidence interval of the mean. If a meteorolo- gist wanted to use the highest speed…

A: Given : Sample Size, n = 13 Sample Mean, x̄ = 15 sample standard…

Q: 1. An semicon company manufactures LED bulbs that have a length of life that is approximately…

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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: Suppose that for a random sample of 250 firms that revalued their fixed assets, the mean ratio of…

A: Sample Mean 1 (\bar X_1)(Xˉ1​) = 0.6290.629 Sample Standard Deviation 1 (s_1)(s1​) = 0.1770.177…

Q: To assess the accuracy of a laboratory scale, a standard weight known to weigh 1 gram is repeatedly…

A: Solution: From the given information, confidence level is 0.95, σ=0.01 and E=0.0001.

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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: Suppose that a random sample of 11 scores from a population of test scores is to be used to estimate…

A: Chebyshev's rule and empirical rule and related to the proportion of data that falls with different…

Q: 2. Given a random sample with size 39 taken from a normally distributed population or 200 members,…

A: Given : n= 39 x¯=66 σ=11

Q: 12.10. Question attached. Thank you for answering my question!

A: Bonferrroni's formula for half-width is given by the formula shown below where I = number of means…

Q: 1. The lifetime of a 75 watts lightbulb is normally distributed with mean µ hours and variance σ2.…

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Q: In a sample of 56 tax returns filed by local hotel managers in a recent year, the taxable incomes…

A: 1)At 99% confidence interval the critical value is z0.005 = 2.58 The 99% confidence interval is  +/-…

Q: 1) An electronic manufacturer produces lampshades with a life span of approximately normally…

A: Given: standard deviation(σ)=35

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

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Q: Suppose the scale readings are normally distributed with an unknown mean and standard deviation of…

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Q: The EPA wants to test a randomly selected sample of nn water specimens and estimate the mean daily…

A: It is given that margin of error (E) is 2 and the confidence level is 88.36%.

Q: In a sample of n= 19 lichen specimens, the researchers found the mean and standard deviation of the…

A:

Q: (a) Determine the minimum sample size required to construct a 99% confidence interval for the…

A: Given ME=0.10 Alpha =0.01

Q: A survey of a random sample of 40 actuarial scientists who passed all their exams and are 7. working…

A:

Q: many water specimens are required in the sample?

A: Here use basic of confidence internet and margin of error

Q: suppose X has a mounded-shaped distribution with a standard deviation of O= 3. Find the minimal…

A:

Q: Suppose a randomly selected sample of n = 69 men has a mean foot length of x = 27.9 cm, and the…

A: It is given that sample mean is 27.9 and standard deviation is 3.

Q: Suppose that for a random sample of 200 firms that revalued their fixed assets, the mean ratio of…

A: Given, n1=200 x-1=0.5170 S1=0.148 n2=400 x-2=0.489 S2=0.158 c=99%=0.99

Q: Suppose that the melting point of a brand of ice cream is normally distributed with variance o =…

A: Given information- Population variance, σ2 = 2.75˚C Population standard deviation, σ = 1.6583…

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.