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Q:

What is a Research Hypothesis

A:

A statement that a relationship exists between the variables being studied.

Q:

What is a Directional Research Hypothesis?

A:

A statement that there is a difference between the variables being studied, and states the direction of the difference (one-tailed).

Q:

What is a Non-Directional Research Hypothesis?

A:

A statement that there is a difference between variables being studied, but does not specify the direction of the difference (2-tailed).

Q:

What are the measures of central tendency?

A:

Mean, median, mode

Q:

What is the Mean, and what letter represents it?

A:

M or X (with a line across the top). The center point. The sum divided by the total #of scores.

Q:

What are the pros and cons of the Mean?

A:

Sensitive to extreme scores. Good to use when the data is not categorical.

Q:

What is the Median, and what letter represents it?

A:

Med or Mdn. The midpoint. 50% of scores are above, and 50% are below.

Q:

What is good about the Median?

A:

Less sensitive to extreme scores.

Q:

What is the Mode?

A:

The value that appears most frequently.

Q:

When is it good to use the mode?

A:

When the data is categorical.

Q:

What is a normal curve, and what are it's characteristics?

A:

A bell shaped curve.

1. Mean, median, and mode all equal

2. Symmetrical about the mean

3 tails are Asymtotic, meaning they get closer and closer to the horizontal axis but never touch.

Q:

What is a Null Hypothesis

A:

A statement that there is no difference between the variables being studied, other than by chance.

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