One characteristic of a normal curve is that it is A. Linear B. Bi-modal C. Symm

Question

One characteristic of a normal curve is that it is A. Linear B. Bi-modal C. Symmetrical D. Leptokurtic 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. If all else remains uncharged, a decrease in the level of confidence will lead to a __ interval. A. Narrower B. Wider C. Less significant D. Biased For a random sample of 9 women, the average resting pulse rate is x = 76 beats per minute, and the sample standard deviation is s = 5. The standard error of the sample mean is? A. 0.557 B. 0.745 C. 1.667 D. 2.778 If a distribution has a mean of 100 and a standard deviation of 15, what value would be +2 standard deviations from the mean? A. 70 B. 115 C. 130 D. 85 When events are independent of one another: A. The probability all occur is the addition of the probabilities each will occur B. They are mutually exclusive C. Knowing the outcome for one event, provides no information about whether the others will occur or not D. The probability that one occurs depends on whether or not the others have occurred For a two-tail test, the null hypothesis will be rejected at the 0.05 level of significance if the value of the standardized test statistic z is: A. smaller than 1.96 or greater than -1.96 B. greater than -1.96 or smaller than 1.96 C. smaller than -1.96 or greater than 1.96 D. greater than 1.645 or less than -1.645

Explanation / Answer

21.

Characteristic of normal curve is that it is symmetrical.

22. The central limit theoram demonstates that sample mean tends to be normally distributed in larger samples.

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