Exam 8: Are Your Curves Normal Probability and Why It Counts

If a distribution has a mean of 30 and a standard deviation of 5, how many standard deviations is 60 from the mean?

In order to say that a distribution is positively skewed, which of the following must be true?

To calculate a z score, you subtract ______.

Standard scores are raw scores that have been adjusted for the particular mean and standard deviation of the distribution from which they are derived.

Under the normal curve, if a z score of 1.65 included 45% of the area above the mean, what percentage would remain above 1.65 on the x-axis?

If you know the z score, standard deviation(s), and mean (M), what formula would you use to compute the raw score (X)?

_______ of scores fall within one standard deviation of the mean.

When the left tail of a distribution's curve is longer the right, what is this called?

The percentages or areas under the normal curve can be interpreted as probabilities.

Which of the following is true of z scores that fall below the mean?

z scores that fall below the mean are _______.

_______ of scores fall on either side of the distribution.

If you fold a normal curve, each half would fit perfectly on top of the other.This characteristic is known as _______.

What characteristic of the normal curve deals with skewness?

Which of the following is another name for the normal curve?

Under the normal curve, approximately what percentage of scores falls between −1 and −2 standard deviations below the mean?

What type of standard score is computed by multiplying the z score by 10 and adding 50?

If you want to calculate a z score for a test where your raw score was 24, what other information must you know?

z scores that fall above the mean are _______.

Events that occur in the extremes of the normal curve have a very small probability of occurring.