Threats+to+validity-scenarios

Threats+to+validity-scenarios - Threats to Validity...

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Threats to Validity Worksheet For each of the following case studies: a. identify the type of threat(s) to internal validity b. explain why that threat exists in the design c. suggest a way to redesign the scenario that would help control for the threat(s) Assume that sample size is not an issue and all details of the experiment are provided in the scenario. 1. A group of researchers is interested in determining if there is a difference in attitudes towards the elderly for young and middle-aged adults. The researchers have constructed a scale that has been shown to be highly reliable and valid for measuring attitudes towards the elderly. The researchers recruit subjects from a local store to fill out the scale. A young researcher collected the data from the younger looking participants, and an elderly looking researcher collected the data from the older participants. They then divide the subjects into two groups based on age. The total scores on the scale are compared across the two groups, and they found a significant difference in attitudes towards the elderly. 2. A group of researchers is interested in seeing if choice of undergraduate major influences attitudes towards interacting with homosexuals. The researchers attended a gay rights rally on a local college campus to recruit subjects for their study. Each subject was given a reliable and valid scale to measure their attitudes towards interacting with homosexuals. After comparing the scores on attitude for different majors, they found no significant difference in attitudes. 3. A researcher was interested in the influence of negative thoughts on mood. She hypothesized that reading a list of depressing words would lead to feelings of depression. She randomly selected 150 people. The researcher then selected 50 participants at random who were told to read a list of 20 depressing words twice a day for 10 days (depressed word group). A second group of 50 participants were to read a list of 20 neutral words twice a day for 10 days (neutral word group). The third group of 50 participants were asked to read a list
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This note was uploaded on 09/30/2011 for the course PSY 3335 taught by Professor Osborne during the Summer '10 term at Texas State.

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Threats+to+validity-scenarios - Threats to Validity...

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