For a population of normally distributed scores, μ = 155 and σ = 12, approximately what would be the 95% confidence interval of the population mean based upon a random sample of 16 scores with a mean of 140?

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A: Given that    Sample sizes n1=13    , n2=11      Sample means X̄1=103      , X̄2=116      s1 =15…

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Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if the…

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Q: A doctor wants to estimate the mean HDL cholesterol of all 20-29 year old females. How many subjects…

A: formula for the sample size needed to estimate a population mean is

Q: If a 90% confidence interval for the mean is (75.3 to 80.9), we would reject H0 : = 70 in favor of…

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Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: The formula for the sample size is as follows:

Q: An study was conducted to compare the difference in math scores between police foundations (group 1)…

A: Given : x¯1=68.6s1=3.7n1=30x¯2=69.4s2=4.0n2=32 We want to find 99% confidence interval for the…

Q: Suppose you take a sample of size 45 from a Normal distribution with unknown population mean and a…

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Q: A sample of n = 43 data values randomly selected from a normally distributed population has varlance…

A: Degrees of freedom = n-1=43-1=42 (by using the standard normal table)

Q: if E=0.07 and population standard deviation=0.8 then find the sample size for 99% confidence…

A: Margin of error(E)=0.07 population standard deviation(σ)=0.8 confidence level=99%

Q: A psychologist wants to estimate the variance of scores obtained by employees on a test. A random…

A: Confidence interval:A confidence interval shows the probability that a parameter will fall between a…

Q: Suppose we are interested in a confidence interval for the population mean scores on an exam. A…

A: We have given that,  Sample mean (x̄) = 67.89, population standard deviation (σ) = 9.90 and sample…

Q: If n = 180 and X = 144, construct a 90% confidence interval for the population proportion, p. Give…

A: Solution: From the given information, X=144, n=180 and the confidence level is 0.90. The sample…

Q: You collect a sample of 61 observations of animal heights, in mm. The sample mean is 65.19 and the…

A:

Q: Suppose we are interested in a confidence interval for the population mean scores on an exam. A…

A: We have given that,  Sample mean (x̄) = 107.65, population standard deviation (σ) = 4.72 Then,  We…

Q: use this to find a 95% confidence interval for the mean height of all red maple trees

A: The sample size is n = 146 Sample mean = 59 And sample SD = 12 Since the sample size is large then…

Q: The data for an independent –measures research study produced a sample mean difference of 6 points…

A: Following information is given:

Q: A sample of 25 observations is taken from a normal distribution with unknown mean. The sample mean…

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Q: A random sample of 20 students yielded a mean of 68,55 and standar deviation of 4,59 for scores on a…

A: Introduction:

Q: A random sample of 10 items is taken from a normal population. The sample had a mean of 82 and a…

A: Given: Sample size, n=10 Sample mean, x¯=82Sample sd, s=26Confidence level =99%

Q: (ii) Let (a, b) be the 95 confidence interval for the population mean u. Find the values of a and b.

A: Givenstandard deviation(σ)=1sample size(n)=16Mean(x)=7.3

Q: A sample of n = 16 scores has a mean of M = 58 with SS = 960. Use the sample to construct the 90%…

A: Given  N = 16 M = 58  SS = 960  C1 = 90 For SS we will solve S2 = 64 df = n-1 = 16-1 =15

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: Find the critical value, t c,  used for a 95% confidence interval for the mean with a sample size of…

A:

Q: If n=590 and p=0.93, construct a 90% confidence interval.

A: Express the expression for the confidence interval. C.I=p±Z*p(1-p)n Here, Z* is the critical value .…

Q: Suppose we are interested in a confidence interval for the population mean scores on an exam. A…

A: We have given that.Sample size (n) = 99Sample mean (x̅) = 95.71Population Standard deviations (σ) =…

Q: If the sample mean is 70 and the standard error of the sample mean is 8, what will be the 90%…

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Q: You would like to construct a  99%  confidence interval to estimate the population mean time it…

A: given data,μ=2.2σ=0.5we have to find out the 99% confidence interval for the given…

Q: A group of students go to a lake that you fished in, and caught 28 adult striped bass fish. The mean…

A: Obtain the 95% confidence interval for the population mean of adult striped bass for that lake. The…

Q: doctor wants to estimate the mean HDL cholesterol of all 20 to 29 year old females. How many…

A: Given s=11.2 E=2

Q: the sample proportion of females is  x=118  n=164 P = .720  #1 Make a 95% confidence interval for…

A:

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: If X= 102, o=9, and n=63, construct a 95% confidence interval estimate of the population mean, μ.

A: Formula to constructing the confidence interval about mean , when the population standard deviation…

Q: Suppose scores on exams in Biology are normally distributed with an unknown population mean and a…

A: given data σ = 5.4n = 60 x¯ = 81find 90% ci for μ = ?

Q: We draw a random sample of size 25 from the normal population with the variance 2.4. If the sample…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…