Research has shown that losing even one night’s sleep can have a significant effect on performance...
Research has shown that losing even one night’s sleep can have a significant effect on performance of complex tasks such as problem solving (Linde & Bergstroem, 1992). To demonstrate this phenomenon, a sample of n = 25 college students was given a problem-solving task at noon on one day and again at noon on the following day. The students were not permitted any sleep between the two tests. For each student, the difference between the first and second score was recorded. For this sample the students averaged MD = 1.6 points better on the first test, with SS for the difference scores (i.e. SSD) equal to 150. a. Do the data demonstrate a significant change in problem-solving ability? Use a two-tailed test with a = .01.
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Research has shown that losing even one night’s sleep can have a
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7 1) Research has shown that activating negative stereotypes can have an effect on performance of...
7 1) Research has shown that activating negative stereotypes can have an effect on performance of complex tasks (Jones & 8 Joans, 1972). To test this phenomenon, a sample of n-25 female college students was given a mental rotation task at noon on one day and s again at noon on the following day. On the first day, the students simply completed the task. However, on the second day, a negative stereotype was activated 10 prior to the task by...
2) A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal....
2) A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal. A sample of 9 volunteers was obtained and each participant ate a fixed diet without any oatmeal for 30 days. At the end of the 30-day period, cholesterol was measured for each individual. Then the participants began a second 30-day period in which they repeated exactly the same diet except that they added 2 cups of oatmeal each day. After the second 30-day period,...
6. A two-tailed hypothesis test for a repeated-measures research design Previous studies have shown that playing...
6. A two-tailed hypothesis test for a repeated-measures research design Previous studies have shown that playing video games can increase visual perception abilities on tasks presented in the gaming zone of the screen (within 5 degrees of the center). A graduate student is interested in whether playing video games increases peripheral visual perception abilities or decreases attention to peripheral regions because of focus on the gaming zone. For his study, he selects a random sample of 81 adults. The subjects...
7 1) Research has shown that activating negative stereotypes can have an effect on performance of complex tasks (Jones & 8 Joans, 1972). To test this phenomenon, a sample of n-25 female college students was given a mental rotation task at noon on one day and s again at noon on the following day. On the first day, the students simply completed the task. However, on the second day, a negative stereotype was activated 10 prior to the task by...
6. A two-tailed hypothesis test for a repeated-measures research design Previous studies have shown that playing video games can increase visual perception abilities on tasks presented in the gaming zone of the screen (within 5 degrees of the center). A graduate student is interested in whether playing video games increases peripheral visual perception abilities or decreases attention to peripheral regions because of focus on the gaming zone. For his study, he selects a random sample of 81 adults. The subjects...
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