The normal distribution is___ a___ and____ symmetrical distribution with the mea

Question

The normal distribution is___ a___ and____ symmetrical distribution with the mean, the median, and the mode all coinciding at its peak and with the frequencies gradually decreasing at ends of the curve a. Bell-shaped: empirical. b. Bell-shaped: theoretical. c. Curvilinear: hypothetical. d. Curvilinear: inferential. e. Theoretical: empirical. Considering the properties of the normal curve, if we know the mean and standard deviation, we are then able calculate the____ under the curve between any score and the mean. a. Range. b. Area. c. Mean. d. Mode. e. Median. What percentage of the area under the normal curve falls between plusminus 2 standard deviations? a. 99.72. b. 95.46. c. 68.26. d. 20.05. e. 25.66. The number of standard deviations that a given raw score is above or below the mean is referred to as a: a. Mean. b. Frequency distribution c. Variance. d. Z score. e. None of the above Suppose that in a particular sample, the mean is 70.07 and the standard deviation is 10.27. What corresponds to a raw score of 80? a. 0.97. b. 6.82. c. 9.93 d. 14.61 e. None of the above.

Explanation / Answer

1) option A is correct

2)option B is correct

3)option B is correct

4)option d is correct

5)z score =(X-mean)/std deviation =(80-70.07)/10.27=0.97

option A is correct

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