Question

1. the area under the normal distribution curve that lies within one standard deviation of the...

1. the area under the normal distribution curve that lies within one standard deviation of the mean is approxiamtely ____%.

2. for a normal distribution curve with a mean of 10 and a standard deviation of 5, what is the range of the variable thay defines the area under the curve correaponding to a probability of approximately 68%?
true or false:
3. a probability can be greater than one, but not equal to zero.

4. quartiles are used in box and whisker plot diagrams.

5. to find standard deviation, you must first find variance.
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Answer #1

1. the area under the normal distribution curve that lies within one standard deviation of the mean is approximately 68 %.

2. for a normal distribution curve with a mean of 10 and a standard deviation of 5, what is the range of the variable that defines the area under the curve corresponding to a probability of approximately 68%?

68 % of the data = [ Mean - 1 *S.D , Mean + 1* S.D ]

= [ 10 - 1 *5 , 10 + 1*5]

= [ 5 , 15]

true or false:

3. a probability can be greater than one, but not equal to zero.

False

4. quartiles are used in box and whisker plot diagrams.

True

absolutely true quartiles are used in box and whisker plot diagrams

5. to find the standard deviation, you must first find the variance.

True

standard deviation is in fact the square root of variance.

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