The minimum sample size needed to construct a 95% confidence interval for 4, with error not exceeding 1.5 ifthe sample is to be drawn from a normal population with variance 225 isO a. 384Ob. 27Oc. 246Od. 247e. 385

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

Answered: The minimum sample size needed to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The confidence interval for the difference between two population means that are normally distributed where the population variances are unknown but assumed to be equal rely on: A. the average sample variance. B. the Satterthwaite's approximation. C. the pooled sample variance. D. the estimated sample variance.
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9. A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is a. 70.02 to 81.98 b. 69.82 to 82.18 C. 70.06 to 81.94 d. 69.48 to 82.52
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Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.t Suppose a small group of 20 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with o = 0.32 gram. (a) Find an 80% confidence interval for the average weights of Allen's hummingbirds in the study region. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error (b) What conditions are necessary for your calculations? (Select all that apply.) O normal distribution of weights Oo is known O n is large O o is unknown O uniform distribution of weights (c) Interpret your results in the context of this problem. O The probability that this interval contains the true average weight of Allen's hummingbirds is 0.20. O we are 80% confident that the true average weight of Allen's hummingbirds falls…

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The minimum sample size needed to construct a 95% confidence interval for u, with error not exceeding 1.5 if the sample is to be drawn from a normal population with variance 225 is Oa. 384 O b. 27 Oc. 246 O d. 247 Oe.385