Lecture #4 -

Question 1

The Normal Curve

Answer 1

• A specific bell shaped curve that is unimodal, symmetric, and defined mathematically.

Question 2

Standardization:

Answer 2

• Converts individual scores from different normal distributions to a shared normal distribution.
• New distribution has a known mean, standard deviation, and percentiles.

Question 3

z Score (standard Score):

Answer 3

• Represents the number of standard deviations a particular score is from the mean.

Question 4

z Score Formula:

Answer 4

z = x - u / sigma (o)

Question 5

Distribution Of Means:

Answer 5

• Composed of many means calculated from all possible samples of a given size from the same population.

Question 6

Standard Error:

Answer 6

• Standard deviation of the distribution of means.

Question 7

Central Limit Theorem:

Answer 7

• Refers to how distribution of sample means is more normal than a distribution of scores, even when the population distribution is not normal

Question 8

Central Theorem Key Principles:

Answer 8

1 - Repeated sampling leads to a normal distribution, even if the population isn’t normally distributed.
2 - A distribution of means is less variable than the distribution of individual scores.
3 - The mean of the distribution of means is the same as the population mean.