The Analysis of Biological Data
2nd Edition
ISBN: 9781936221486
Author: Michael C. Whitlock, Dolph Schluter
Publisher: W. H. Freeman
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Chapter 7, Problem 25AP
To determine
To check: Whether there is sufficient evidence to conclude that preferential helping of the nests of kin.
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To study the effectiveness of possible treatments for insomnia, a sleep researcher conducted a study in which four participants were instructed to count sheep (the Sheep Condition), four were told to concentrate on their breathing (the Breathing Condition), and four were not given any special instructions. The average number of minutes taken for each participant to fall asleep over the next seven days were 14, 28, 27, and 31 minutes for the Sheep condition; 25, 22, 17, and 14 minutes for those in the Breathing condition; and 45, 33, 30, and 41 for the Control condition. Using the .05 significance level, did the different techniques have different effects?
Now you have to use the numbers you just came up with to plug into the formula for the within-groups variance estimate (given below). The “answer” you get is your final number for the within-groups variance.
S2Within= S21 + S22 + S23 / NGroups…
To study the effectiveness of possible treatments for insomnia, a sleep researcher conducted a study in which four participants were instructed to count sheep (the Sheep Condition), four were told to concentrate on their breathing (the Breathing Condition), and four were not given any special instructions. The average number of minutes taken for each participant to fall asleep over the next seven days were 14, 28, 27, and 31 minutes for the Sheep condition; 25, 22, 17, and 14 minutes for those in the Breathing condition; and 45, 33, 30, and 41 for the Control condition. Using the .05 significance level, did the different techniques have different effects?
Determine the cutoff sample score on the comparison distribution at which the null hypothesis should be rejected.
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Dogs Ignore an Unreliable Person
A study¹ investigated whether dogs change their behavior depending on whether a person displays reliable or unreliable behavior.
Dogs were shown two containers, one empty and one containing a dog biscuit. An experimenter pointed to one of the two containers.
If the experimenter pointed to the container with the treat on the first trial, 16 of 26 dogs followed the experimenter's cue on the
second trial. However, if the experimenter misled the dog on the first trial, only 7 of 26 dogs followed the cue on the second trial. Test
to see if the proportion following the cue is different depending on whether the person exhibited reliable or unreliable behavior. The
standard error for the difference in proportions is 0.138. Use a 5% significance level.
Let group 1 be the dogs to follow a cue from a person who is reliable and let group 2 be the dogs to follow a cue from a person who is
unreliable.…
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The Analysis of Biological Data
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