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A researcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression. One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin. A second sample of rats receives a drug that lowers brain levels of serotonin. Then the researcher tests the animals by recording the number of aggressive responses each of the rats display. The data are as follows.
Control
Low Serotonin
n = 10
n = 15
xbar = 14
xbar = 19
SS = 180.5
SS = 130
a) Does the drug have a significant effect on aggression? Use Alpha = .05.
b) What is Cohen's d?
Among its various routes, a transit agency operates a trolley line. The line has a total of 18 trolley cars. Some of these cars are unavailable because they are being maintained or repaired.
An upper-level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores and 7 freshmen.
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
Describe the use of normal probability plot to evaluate whether a set of data is normally distributed?
It labels the top 5% (the heaviest 5%) overweight. How heavy does a box have to be for it to be labeled overweight? Round your answer to the nearest hundredth.
Determine the minimum sample size required in order for you to be confident that your evaluate is within of? Use value for population standard deviation of scores on this subsection.
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important?
In testing the equality of the two means below, what is the test statistic? (Use the unequal variances formula)
In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the variance?
How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.
twelve plots of land are divided randomly into 3 groups. fertilizers a b and c are applied to the three groups
among the 15 scientists working on a research project 10 have ph.d.s. if four of these scientists are chosen at random
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