27 Aug 4. The following frequency distributio
4. The following frequency distribution table lists the time (in minutes) that participants were late for an experimental session. Compute the sample mean, median, and mode for these data.
mean Correct: Your answer is correct. min
median Correct: Your answer is correct. min
mode 0 Incorrect: Your answer is incorrect. min
Time (min) Frequency
0 3
5 2
6 5
7 1
9 2
______________________________________________________________________________
7. A neuroscientist measures the reaction times (in seconds) during an experimental session in a sample of cocaine-addicted
(n = 8),
morphine-addicted
(n = 6),
and heroin-addicted rats
(n = 12).
Mean reaction times in each sample were 16, 14, and 12 seconds, respectively. What is the weighted mean for all three samples? Hint: The overall mean is not 14.0 seconds. (Round your answer to two decimal places.)
____________ sec
______________________________________________________________________________
9. A group of researchers measure the weight of five participants prior to a clinical weight loss intervention. They record the following weights (in pounds): 160, 110, 210, 310, and 260 pounds. The mean is 210 pounds.
Using the original example of five weights, the researchers added a sixth participant to the sample.
(a) If the sixth participant weighed 220 pounds, will the mean increase, decrease, or not change?
The mean will increase.
The mean will decrease.
The mean will not change.
(b) If the sixth participant weighed 210 pounds, will the mean increase, decrease, or not change?
The mean will increase.
The mean will decrease.
The mean will not change.
(c) If the sixth participant weighted 180 pounds, will the mean increase, decrease, or not change?
The mean will increase.
The mean will decrease.
The mean will not change.
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