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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.
Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music. Provide all details for the test. (Round your value for z to two decimal places. Round your P-value to four decimal pla..
question a pair of dice is rolled. the sum of the faces on top is observed. what are the expectation variance and
Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
Dr. H wants to conduct a statistical test that will show her new medication to be effective in decreasing violence in criminals. What is the null hypothesis? What is the alternate hypothesis?
Search the internet for real-life examples of probability. As a hint, type "probability" followed by a topic of interest to you into the search engine
If, for a particular junction, the acceptor concentration is 1017/cm3 and the donor concentration is1016/cm3, find the junction built-in voltage. Assume ni = 1.5×1010/cm3.
The quality control manager for ENTA Inc. must decide whether to accept (a1), further analyze (a2) or reject (a3) a lot of incoming material. Assume the following payoff table is available.
1. In real-world situations, what is the advantage of using the Method of Substitution to solve a system of equations rather than using the Method of Addition?
suppose that you are trying to estimate average iq and its standard deviation. you know that iqs are distributed
Discussion 1: Many people do not "like" or "trust" single point estimates for things they need measured. How might adding confidence intervals help managers accept the results better? Why?
of all mortage foreclosures in the united states 69 are caused by diability . people who are injured or ill cannot work
Discuss how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score.
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