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Researchers wanted to determine whether the reaction time in seconds of males differed from that of females to a go/no go stimulus. The researchers randomly selected 20 females and 15 males to participate in the study. The go/no go stimulus required the student to respond to a particular stimulus and not respond to other stimuli.
(a) Is it reasonable to use Welch's t-test? Why?
What is the probability that at least three students choose Supreme Chocolate?
What null and alternative hypotheses would be appropriate in evaluating the statement made by this legislator?
let x be a continuous distribution with probability density function fx2 x32 if xgt -2 and fx0 otherwiselet yx2.
A friend has performed a signi?cance test of the null hypothesis that two means are equal. His report states that the null hypothesis is rejected in favor of the alternative that the ?rst mean is larger than the second.
What statistics test should I be using when I am assessing whether subjects were able to complete a task (i.e. Yes/No nominal data) before instructions, after instructions and then again after a demo
For the following data obtained from four independent samples, use the 0.025 level in testing H0: 7r1 5 7r2 5 7r3 5 7r4 versus H1: At least one popula- tion proportion differs from the others.
Write methods that accept an array or list and returns lowest score, highest score, median score, average score and the standard deviation of the scores.
many people believe that unusual behavior is more likely to occur during a full moon. in fact they believe that twice
In the sample of 80 students, 9 were found to be overweight. At a= 0.01, is there adequate evidence to reject claim using critical values?
an insurance company would like to estimate the average liability dollars that they pay out due to automobile accidents
This is a modification of Exercise. The risk of getting lung cancer at some point in one's life for men who have never smoked is about 13 in 1000.
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities.
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