The z value for a 96.6% confidence interval estimate is A. 2.00 B. 2.12 C. 1.96 D. 1.82

Q: If n = 520 and (p hat )= 0.45, find the margin of error at a 95% confidence level

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Q: Question 3: A random sample of 55 observations produced a mean value of 28 and a standard deviation…

A: Given  mean=x̄=28, n=55, s=1.3

Q: Find a 99% confidence interval for the population mean for the data set (120, 80, 83, 115, 95, 90,…

A: Solution-:

Q: If X = 114, α= 20, and n = 33, construct a 99% confidence interval estimate for the population mean,…

A: Given data:  Sample Mean = 114 Population standard deviation = 20 Sample size = 33 Confidence level…

Q: The width of a confidence interval for the population proportion will be: Select one: a. wider for…

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Q: If n = 28, ¯xx¯ = 49, and s = 19, construct a confidence interval at a 90% confidence level. Assume…

A: Given information- Sample size, n = 28 Sample mean, x-bar = 49 Sample standard deviation, s = 19…

Q: The foot lengths of a random sample of 53 men had a mean of 27 cm and a standard deviation of 2 cm,…

A: Solution-:   Given: n1=53 (men), n2=100 (women), x1¯=27, x2¯=23.5, s1=2, s2=2, α=0.05 We want to…

Q: if ue want a 96%. confidence nterval on populatron mean with a sample size of a3, find or 土

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Q: Answer part b

A: Solution Weight can be written in fraction

Q: You may need to use the appropriate appendix table or technology to answer this question. What is…

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Q: Conduct a confidence interval for the following data: Confidence interval % = .98 Sample…

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Q: Find n for a 98% confidence interval for p with E = 0.017 using an estimate of p = 0.8. (Round up to…

A: Proportion = p = 0.8 Margin of Error = E = 0.017 Confidence Level = 98 Significance Level = α…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given95% confidence interval N=361 x = 59.1 seconds. z= 4.9 SecondsFind the margin of error?

Q: If a 90% confidence interval for the difference of means ?1 – ?2 contains all positive values, what…

A: Introduction: A 90% confidence interval indicates an interval, which, the researcher is 90%…

Q: Form a 90% confidence interval on the difference in the means. population std dev group mean 6.

A: Given,    Group n Mean Population standard  deviation 1 30 20.5 1.5 2 30 14.5 1.5

Q: Provide an appropriate response. Assume that the heights of bookcases are normally distributed. A…

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Q: If X 121, o =27, and n 38, construct a 95% confidence interval estimate of the population mean, u.…

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Q: Question IX Find za/2 for each of the following confidence levels used In estimating the populatlon…

A: Confidence Interval: In statistics, we can say a range of values of the population parameter will…

Q: Construct the confidence interval for the population mean μ. c= 0.90, x= 5.4, o=0.4, and n = 58

A: The confidence level c=0.90 Sample mean = 5.4 Population standard deviations= 0.4 Sample size n= 58…

Q: An advertisement agent computed 90%, 95%, 97%, and 99% confidence intervals for the mean lifetime of…

A: given data  we constructed 4 different confidence intervals.  90% ci, 95% ci, 97% ci, 99% ci.  the…

Q: Find the margin error for the estimating the true proportion at 95% confidence level.

A: A random sample of 120 adults showed that 42 are already fully vaccinated. P ^=42/120 =0.35  ZC for…

Q: The foot lengths of a random sample of 53 men had a mean of 27 cm and a standard deviation of 2 cm,…

A: Given, n1=53               n2=100 x1=27                x2=23.5 s1=2                  s2=2…

Q: Suppose someone wanted an 75%-confidence interval. What value of z should they use? Choose the…

A: Level of significance ɑ=0.25

Q: For 99% confidence level, significance level is a. 0.1 b. 0.05 c. 0.025 d. 0.01

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Q: If X=99​, S=7​, and n=64​, and assuming that the population is normally​ distributed, construct a…

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Q: Example: A sample of 10 measurements of the diameter of a sphere has a mean x = 4.38 cm and a…

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Q: For a fixed sample size, what happens to a confidence interval for the population mean when we…

A: The confidence interval is the interval in which the population parameter is likely to fall. For…

Q: QUESTION 13 An analyst is conducting a hypothesis test to determine if the mean time spent on…

A: Given that  Sample Mean \bar XXˉ = 2.52.5 Population Standard Deviation (\sigma)(σ) = 22…

Q: 1. Thet value with 95% confidence and 24 degrees of freedom is A. 1.711 B 2.064 C. 2.492 D. 2.069

A: Option B) 2.069 Explanation:

Q: Construct the confidence interval for the population mean u.  c​= 0.95, x= 15.7, o= 7.0, and

A: c​= 0.95, x= 15.7, o= 7.0, and n= 90

Q: If n = 16, = 42, and s 7, construct a confidence interval at a 95% confidence level. Assume the data…

A: Sample mean = x̅ = 42 Sample size = n = 16 Sample S.D = s = 7 Standard Error = s/√n  = 7/√16 =…

Q: If the alpha level is .05, then the confidence level is ?

A: Given: alpha = 0.05 confidence level / significant level = 1 - alpha

Q: The estimated prevalence is 38%, and the desired confidence level is 98% with a margin of error of…

A: From the provided information, Proportion (p̂) = 0.38 Margin of error (E) = 0.01 Confidence level =…

Q: Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval…

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Q: With 95% confidence, what is the margin of error when estimating a population mean when n = 100 and…

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Q: Assume that a sample is being used to estimate a population mean μμ. If n = 19, x¯ = 43, and s = 3,…

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Q: If n=41, ¯x=39, and s=16, construct a confidence interval at a 99% confidence level. Assume the data…

A: Given that  Sample size (n) = 41 Sample mean (x¯) = 39 Sample standard deviation (s) = 16 Confidence…

Q: Which estimate at a 95% confidence level most likely comes from a small sample? OA. 78% (14%) OB.…

A: The provided information is  α=0.05 The critical value is  z=1.96    (from statistical table)…

Q: If n = 530 and X = 424, construct a 99% confidence interval for the population proportion, p. Give…

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Q: Find the critical value tc for a 95% confidence level when the sample size is 13.   A. 1.753   B.…

A: According to the given information, we have Sample size, n = 13 Confidence level = 95%

Q: At 95% level of confidence the Z value is 2.575?

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Q: 4. Which one of the following is used for categorical data? a. Histogram b. Pie Chart C. Stem and…

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Q: Suppose we calculated the minimum sample size needed to create a C% confidence interval with a…

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Q: A car insurance company wanted information about the age of its customers. A researcher computed…

A: given data  there are 4 confidence intervals (36.30,39.70) (36.70,39.30) (36.56,39.44) (36.91,39.09)…

Q: The estimated prevalence is 19% and the desired confidence is 93% with a margin of error of 4%.…

A: Given,margin of error(E)=0.04sample proportion(p^)=0.19α=1-0.93=0.07α2=0.035Z0.035=1.8119…