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Decisions about alpha level may be different, especially as it relates from hard sciences to social sciences. For example, a medical trial for cancer treatments conducts their statistical tests at .0001 - so for every 1 out of 10,000 patients, there may be issues, sickness or even death. For social science, we use alpha .05. We are comfortable with performing research, for example, on students. So we are satisfied with losing 5 out of 100 students or having our results being incorrect 5 out of 100 times. Do you agree with these alpha levels? Why or why not? What if your child's education and the teacher assigned to him/her would be successful 95 out of 100 times?
The standard deviation of a sample was found to be 20. It is known that sigma (X - x-bar)2 = 7200. Given this, what was the sample size (n)?
martindate were tester which can compare two materials in sigle run, weights losses from seven runs. Examine these data by creating the 90% confidence interval for difference of means. Define your assumption.
A marketing research company was interested in importing apples. There were three different varieties, and the number purchased was found to be:
Express Var(X) in terms of p, E(N), and Var(N), by using the law of total variance.
Green that was desired by students to live on. A sample of students responses are reproduced below. Do students prefer a particular Green?
The army's helmet supplier regularly stocks helmets that fit male soldiers with head circumferences between 20 and 26 inches.
Assume you roll two regular (and fair, i.e., unbiased, not loaded) six sided dice together once.
Being a student, you probably have well-developed feelings about homework. Given the same amount of material learned, the less the better, right? (I thought so!) Define home work as the number of hours spent outside of class on various assignments..
Suppose that in 20% of all traffic accidents involving an injury, driver distraction in some form (for example, changing a radio station or texting).
for a one-tailed hypothesis test the critical z-value of the test statistic is -1.48. which of the following is true
A recent study focused on the number of times men and women who live alone buy take-out dinner in a month. The information is summarized below.
"Do you believe that gun control laws which restrict the ability of Americans to protect their families should be eliminated?"
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