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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A statistical research yields to the sample proportion of a certain feature in a certain community be 0.56. Find the required sample size for a maximum margin of error of 0.05 for a 90% confidence interval. O a. 211 O b. 266 O c. 276 O d. 267
It may be assumed that the time patients spend waiting to consult a doctor in a polyclinic is normally distributed. A random sample of 5 observations give the following sample statistics: sample mean - 30 minutes and sample variance = 86. Suppose the population variance is unknown, what is a 95% confidence interval of the population mean μ? O 18.40 μs 32.97 O 18.49 sus 41.51 O 19.55 sus 37.10 O 17.13 μ ≤ 42.87
The following statistics are computed by sampling from three normal populations whose variances are equal: (You may find it useful to reference the table and the gtable.) X1 = 30.7, n₁ = 7; X2 = 36.9, n₂ = 8; X3 = 42.9, n3 = 4; MSE = 29.0 a. Calculate 95% confidence intervals for 1 - W2, H1 - H3, and 42 - 3 to test for mean differences with Fisher's LSD approach. (Negative values should be indicated by a minus sign. Round final answers to 2 decimal points.) Population Mean Differences H₁-H₂ H₁ H3 H2 H3 Confidence Interval -12.06 -9.01 Can we conclude that the population means differ? Yes Yes No
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6.
For a population data set sigma = 12.7 How large a sample should be selected so that the margin of error of estimate for a 96 confidence interval for u is 3.20?
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4. The lower value of a 90% confidence interval for the variance in maze-running times of a sample of 31 rats is 4.62. Based on this, form a 98% confidence interval for 02 Answer: 3.973 to 13.5219
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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