20. Suppose an interval estimate for the population mean was 62.84 to 69.46. The
ID: 3326462 • Letter: 2
Question
20. Suppose an interval estimate for the population mean was 62.84 to 69.46. The population standard deviation was assumed to be 6.50, and a sample of 100 observations was used. The mean of the sample was: A. 56.34 B. 62.96 C. 6.62 D. 66.15 21. One characteristic of a normal curve is that it is A. Linear B. Bi-modal C. Symmetrical D. Leptokurtic 22. The central limit theorem demonstrates that A. The value of the mean tends to increase as the sample size increases. B. Sample Means tend to be normally distributed in larger samples. C. Sample Means tend to be chi square distributed in larger samples D. The value of the mean tends to decrease as the sample size increases.Explanation / Answer
20) When data symmetric(equally) distributed on two sides of the curve. Mean, mode and median all are equal to the normal distribution.
Interval range: 62.84 to 69.46= (69.46+62.84)/2 = 66.15
Answer D
21) The normal curve is called a bell curve. For a normal distribution, symmetric, unimodal, asymptotic and the mean, median and mode all are equal.
Answer C
22) When sample size increases, a sample mean tends to become population mean in a normal distribution.
Answer B
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