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Hooded rats: social play times. How does social isolation during a critical developmental period affect the behavior of hooded rats? Psychology students assigned 24 young female rats at random to either isolated or group housing, then similarly assigned 24 young male rats. This is a randomized block design with the gender of the 48 rats as the blocking variable and housing type as the treatment. Later, the students observed the rats at play in a group setting and recorded data on three types of behavior (object play, locomotor play, and social play).8 The data file records the time (in seconds) that each rat devoted to social play during the observation period.
(a) Make a plot of the 4 group means. Is there a large interaction between gender and housing type? Which main effect appears to be more important?
(b) Verify that the conditions for ANOVA inference are satisfied.
(c) Give the complete two-way ANOVA table. What are the F statistics and P-values for interaction and the two main effects? Explain why the test results confirm the tentative conclusions you drew from the plot of means.
Let f:N x N -> N be the function defined recursively as follows: Use induction on the sum i + j to prove that f(i, j) = 2i + j + 6 for all (i, j) in N x N.
on one busy holiday weekend a national airline has many requests for a standby flights at half of the usual one way
Iif the sample consits of 16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? use a two tailed test with .05.
here are the golf scores of 12 members of a college womens golf team in two rounds of tournament play. a golf score is
As the video titled "Melissa Forman - Hilarious Resume Typos" (4 min 55 s) located at https://www.youtube.com/watch?v=FClWySJ6Sxs demonstrates it is very important to avoid mistakes when writing resumes and cover letters.
1.last week john quinn sat back in a chair with his feet on his deck and nodded at his wife kate. they had just
T-scores are used on some psychological tests, such as the MMPI. T-scores have a mean of 50 and a standard deviation of 10, and therefore a z-score of -1 (one standard deviation below the mean) would be converted to a T-score of 40.
Locate a business periodical such as Fortune or Forbes or a business newspaper such as The Wall Street Journal. Find three examples of the use of a graph to display data. For each graph
Define the population. State the hypotheses for the study. Decide which statistical test is appropriate and compute the test statistic (z or t). Why is the test appropriate?
1. In an experiment on the uptake of solutes by liver cells, a researcher found that six determinations of the radiation, measured in counts per minute after 20 minutes of immersion, were:
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
suppose you have some data gathered from a repeated experiment. if you want to make inferences about the data collected
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