24. For a random sample of 9 women, the average resting pulse rate is x 76 beats

Question

24. 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 25. If a distribution has a mean of 100 and a standard deviation of 15, what value would be 2 standard deviations above the mean? A. 70 B. 115 C. 130 D. 85 26. 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 7. 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

Explanation / Answer

24) The standard error = s/Sqrt(n) = 5/Sqrt(9) = 1.667 (Option C)

25) 2 standard deviations above the mean = 100 + 2*15 = 130 (Option C).

26) Option C

27) The null hypothesis is rejected if z is : smaller than -1.96 or greater than 1.96

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