a) Given that is normally distributed and given that the sample values and Find the 98% confidence interval for

Q: Suppose the NCES would like to re-do their study. If they want a 95% confidence interval with a…

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Q: Suppose that the population standard deviation of students score is 20. what is the sample size so…

A:

Q: if n=50, bar-x = 35 and s = 16 construct a confidence interval at a 99% confidence level, assume the…

A: Answer: From the given data, Sample size(n) = 50 mean (X¯) = 35 Standard deviation(S) = 16 99%…

Q: Create a 95% confidence interval for the data set below. ( 48 48 48 [three decimal accuracy] 45 51…

A: xx2482304482304482304452025512601512601441936462116452025

Q: Assume that 66 % of single women and 81.9 % of single men own cars. Also assume that these estimates…

A: Given data, p1=66%=0.66 n1=1640 p2=81.9%=0.819 n2=1800 z-value at 99% confidence is Zc=2.576

Q: We take a sample of 50 people and obtain a sample mean of 147 pounds with a standard deviation of 15…

A: We have given that  Sample size n = 50 Sample mean = 147 Standard deviation = 15 90%confidence…

Q: A random sample of 100 Colorado residents is selected, and it is found that 82% of them have Subaru.…

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Q: need to show the 5 step hypothesis

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Q: If Xbar=81​,S=20​,and n=36​,and assuming that the population is normally​ distributed, construct a…

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Q: If n=41n=41, ¯xx¯=36, and s=9s=9, find the margin of error for a 80% confidence level.

A: Answer - Given, Sample size n = 41,    x  = 36    and s = 9               80% confidence interval…

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: 4. Assume that 66 % of single women and 81.9% of single men own cars. Also assume that these…

A: From the provided information,

Q: 90% confidence interval is narrower than a 95% confidence interval using the exact same data.…

A: Conditions on confidence interval:   As the confidence level increases, width of the confidence…

Q: Determine the sample size needed to create a 99%

A: Given that  Margin of error =E =0.05 The confidence level is 99%. The sample proportion can be taken…

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 497,…

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Q: If no previous study has been done, give the sample size we should use to find p with a margin of…

A: Given that, Critical value: Using the z-table, the critical value at 90% confidence level for two…

Q: if for some reason it was not possible to obtain the 99% confidence interval from SPSS, how could…

A: Given information: Confidence level=99%=0.99α=1%=0.01

Q: 3. The sample (1,2,3) is randomly selected from a normal population. Construct a 98% confidence…

A: Given Sample size, n=3 Sample = 1,2,3 Confidence interval =98% α=1-0.98α=0.02zα2=2.326

Q: in a random sample of 60 students from a very large university, only 25% were able to identify…

A: Given Sample size n=60, sample proportion p^=0.25  Construct 95% CI for population proportion p

Q: In what are we confident after we’ve calculated a 95% confidence interval – the value of that…

A: still wrong. The 95% is not for the construction of the interval, but for the method of constructing…

Q: A random sample of 25 business students required an average of 50.7 minutes to complete a statistics…

A: Given that, Mean = 50.7 Standard deviation = 10.4 Sample size = 25

Q: If the number of smokers in a sample of 40 students selected from university A is 12 and the number…

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Q: If a sample has has a 94% confidence interval of (4.68,5.43), what is the 2-decimal margin of error?

A: Given information- We have given the confidence interval is- C.I = (4.68, 5.43) Lower limit = 4.68…

Q: In a sample of 600 Ottawa families, it is found that 360 rent their dwellings while 240 own their…

A: It is given that sample size (n) is 360 and x is 240.

Q: Forty-two items are randomly selected from a population of 500 items. The sample mean is 40 and the…

A: Given : Population size (N) = 500 Sample size (n) = 42 Sample Mean (μ) = 40 Sample standard…

Q: If N=480 and p̂ (p-hat) =0.88, find the margin of error at a 95% confidence level.

A: From the provided information, Sample size (n) = 480 p̂ (p-hat) =0.88 Confidence level = 95%

Q: Independent samples from two different populations yield the following data. x1=200,x2=963,…

A: Given  x1=200,x2=963, s1=19,s2=86 Find 90%CI for u1-u2

Q: Find 80%, 85% and 99.9% confidence interval for the sample mean of a pouplation, if we know that in…

A: Given information: Sample mean=60 Standard deviation =5 Sample size=70

Q: Find the value of ta/2 and n = 25 for the 90% confidence interval for the mean if the population…

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Q: For a given sample, a 50% confidence terval for the population mean is narrower than a 90%…

A: For  a given sample size and population standard deviation, the interval estimation of the…

Q: If the number of smokers in a sample of 160 students selected from university A is 56 and the number…

A: From the provided information,

Q: If a 90% confidence interval for the difference of proportions contains some positive and some…

A: The 90% confidence interval for the difference of proportions contains some positive and some…

Q: 2. A group of students working on their thesis took a random sample of 100 families in a certain…

A: Given Sample size=100, sample mean x̄=1146, sample standard deviations s=650  Construct 90% CI for…

Q: the sample size affects the margin of error and the width of the interval . Report confidence…

A: here given ,   The St. Lucie County Economic Development Board needs to estimate the proportion of…

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.