Exam 7: Theoretical Distributions Including the Normal Distribution

Given below are lower and upper limits of areas of the normal curve. Choose the limits that mark off the greatest proportion of the normal curve.

The normal distribution

An inflection point on a normal curve is found at the

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3. -Look at Data Set 7-4. What scores are so extreme they are made by only five percent of the population?

What proportion of the normal curve lies between +1.5 $\sigma$ and -1.5 $\sigma$ ?

The normal distribution is symmetrical about the median.

For a normal distribution with a mean of 32 and a standard deviation of 3, a. find the proportion of the distribution scoring 30 or more. b. find the proportion that scored between 30 and 35. c. find the scores that separate the middle 60% from the extremes.

The numerator of the z score in Chapter 7 is a standard deviation.

The theoretical normal curve has a mean equal to and a standard deviation equal to.

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -If Data Set 7-5 were based on 500 scores, the number with scores between 175 and 200 would be

When your text addressed the question of how universal the normal curve is in psychological data, it quoted an article that described normal curves as

The total area of theoretical distributions described in Chapter 7 was 1.00.

Data Set 7-3: A population of scores was normally distributed with a mean of 32 and a standard deviation of 3. -For Data Set 7-3, the scores that separate the middle 60 percent from the extremes are

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -Use Table C to answer questions about Data Set 7-5. The proportion of the population with scores less than 225 is

The inflection points on the normal curve are at one standard deviation above the mean and one standard deviation below the mean.

Rectangular, binomial and normal curves have the following in common:

Continuing the example of the Ace Slap-Stick Comedy Test, Bud claimed that, because 10% of the population had scores of 60 or better, which is 10 points from the mean, 5% must have had scores of 70 or better, because doubling the score distance always halves the percentage.

The inflection points on the normal curve are at the mean and the median.

A point on the normal curve with .15 of the curve below it has .35 between it and the mean.

Your text credits Gauss with developing the