Stats Chapter 6 T/F & Short Answer

The standard deviation of sample means will be larger than the standard deviation of the population, and it will be equal to the population standard deviation multiplied by the square root of the sample size.

False

The total area under the normal distribution curve is approximately 0.99 but can never be equal to 1.0

False

When finding the area under the curve between two z values, the procedure is to subtract the two z values and look up the corresponding area in table e of appendix c.

False

Which property distinguishes the standard normal distribution from other normal distributions?

Mean is 0 and standard deviation is 1

On an easy test, the mean score was 95 out of a possible 100 points. The distribution of all test scores is most likely to be

Negatively skewed

Give the type of distribution pattern that occurs when the majority of the data values fall to the left of the mean?

Positively skewed

In applied statistics, the area under the normal distribution curve is more important than the frequencies.

True

The area under the curve is always positive even if the z value is negative

True

The following formula can be used to find a specific value from a data set: X = z • o • u

True

The normal distribution curve can be used as a probability distribution curve for normally distributed variables.

True

When the majority of the data values fall to the right of the mean, the distribution is said to be left skewed.

True

The number of standard deviations a particular x value is from the mean is commonly referred to as

Z