3. What proportion of scores fall between -2 and 2 standard deviation units around the mean in a z distribution? a. 68% b. 95% c. 99% d. 34% 4. Which of the following statements describes one of the principles of the Central Limit Theorem? a. Repeated sampling does not approximate a normal curve. b. A distribution of means is more variable than a distribution of individual scores. c. A distribution of means is less variable than a distribution of individual scores. d. Repeated sampling ruins a distribution of scores.
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1- A-Find the raw scores that cut-off the most extreme 5% under the normal distribution's curve that has a mean of 12 and standard deviation of 3.5. a. ±1.96 b. 6.24 and 17.76 c. 5.14 and 18.86 d. ±1.645 B) Find the raw score that cuts-off the largest 5% under the normal distribution's curve that has a mean of 72 and standard deviation of 12. a. 1.645 b. 95.52 c. 91.74 d. 1.96 C) Find the z score that corresponds to P30 (the 30th percentile). a. -0.52 b. 0.76 c. -1.88 d. 0.62
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