Stats chapter 6 review

The Z value corresponding to 48.81% of the data is 2.20 in table E of appendix C

false

The area to the right of Z= 1.83 is 0.4256

false

The standard deviation of sample means will be larger than the standard deviation of the population, and it will either 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 .99 but can never be equal to one

false

Z value that corresponds to the 40th percentile is Z equals 1.72

false

if the area under the normal distribution curve that lies within three standard deviation of the mean is approximately 95%

false

the figure is an example of a negatively skewed distribution (mean to the right)

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 each of the appendix C

false

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 _______ skewed

negatively

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

positively skewed

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

true

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

true

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

true

the following formula can be used to find a specific value from a data set X=z•sd+mean

true

the p(0<z<2.25) is 0.4878

true

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

true