Validity & Reliability
Review and Practice for Quiz #1

1.  A speedometer that is always fast by 10 MPH would be __________ in validity and __________ in reliability.

2.  A speedometer that is always accurate would be __________ in validity and __________ in reliability.

3.  If my speedometer is always fast by 10 MPH and I am conducting research that uses speed as a DV, then the inaccuracy of my speedometer is going to lead to __________ error.

4.  Since my speedometer is broken, I want to measure speed by having 5 people watch my car and then make judgments about its speed.  The extent to which these people agree on my speed would be ____________________, which is quantified by the Greek letter ________.

5.  If I buy a new speedometer that only measures speed from 40-100 MPH, it would be considered low in ____________________.

6.  Eventually, I give up on the speedometer idea and switch my research hypothesis to the question of what type of person tends to engage in risky driving behavior.  I come up with a 10-item scale to measure this tendency.  The extent to which these items are correlated with each other determines the scale's ____________________, which is quantified by the Greek letter ________.

7.  The extent to which this scale measures the conceptual variable of interest, risky driving tendencies, is referred to as ____________________.

8.  If I can infer the level of the answer to #7 just by looking at the scale, it would be high in ____________________.

9.  When participants take my scale twice within the same week, their scores tend to change drastically from one sitting to the next, suggesting the scale is low in ____________________.

10.  High scores on my scale do correlate with actual risky driving behavior, which means my scale is high in ____________________.

11.  Finally, my scale tends to be correlated with other scales that measure risky driving behavior, meaning that it is high in ____________________.  But the fact that my scale also correlates with scales unrelated to risky driving means that it is low in ____________________.

 

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