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Psychology essay help?

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"Professor Jackson believes that frustration increases the need for achievement. She decided to test her hypotheses with her Intro. Psychology class of about 100 students. The first 50 students who arrive for class one day are taken to a separate room and given a series of easy puzzles to complete. Professor Jackson then asks each student about his or her professional goals. She rates the statement of each on a 7-point scale for strength of achievement motivation.

When they arrive, the remaining students are taken to another room and given a series of difficult puzzles by Professor Jackson's assistant, Jim. Jim asks each student about his or her professional goals and, like Professor Jackson, then rates each statement on a 7-point scale.

The group given the more difficult puzzles has, on average, higher achievement motivation than the group given the easy puzzles. Professor Jackson concludes that her hypotheses is supported."

How would confounding variables make the experiment design flawed? There were 4 other parts, but I got that from the textbook I was given.

You don't need to give me the exact answer, just something to help out? Thanks in advance.

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  1. haha oh wow i'm doing this in my psych too...well she didn't really do random sampling..tht could be a possibilty..um she didn't have a control variable? hm yeh..my brain is fried..thts all i can come up with...i'm so close to the answer i just cant think of it...


  2. Okay, I'm not sure, but here are my thoughts:

    1. Professor Jackson worked with one group and her assistant did the other. Shouldn't the same person or people have interviewed both groups?

    2. The first 50 people to arrive made up group one and the later ones group 2. As far as we know, people who come to class late could have higher achievement motivation. Of course that goes against what we think would be true, but that doesn't matter. We have to eliminate that variable. The groups should have been selected randomly, not based on when they showed up to class.
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