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A researcher conducted an experiment on the effects of a new "drug "on depression. The researcher had a control group that received nothing, a placebo group, and an experimental group that received the "drug." A depression inventory that provided a measure of depression on a 50-point scale was used (50 indicates that an individual is very high on the depression variable).
a. Is Fobt significant at Fobt= .05; at Fobt= .01?
b. Perform post hoc comparisons if necessary.
c. What conclusions can be drawn from the F-ratio and the post hoc comparisons?
d. What is the effect size, and what does this mean?
e. Graph the means.
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee.
the one-dimensional class-conditional feature pdfs for a 2-category classification problem have triangular shapes px?1
Write a hypothesis about the length of words in newspapers and magazines, Design and carry out an investigation to test your hypothesis.
a network engineer is working to improve password strength. if he tells his client that all passwords must contain a
Suppose in an attempt to develop marketing materials Tyco marketers are interested in determining whether there is a significant difference in the cost of replacing pipeline seals in different countries.
a random sample of the amount paid in dollars for taxi fare from downtown to the airport was obtained. give your
When carrying out a large sample test of H 0 : m =10 vs. H a : m ¹ 10 by using a p-value, we reject H 0 at level of significance α when the p-value is:
construct and interpret a 95% confidence internal estimate of the pop mean of all such temp and what is the point estimate for the pop mean of all temp.
joint pmf p(X1,X2)=(X1+2X2)/18, (x1,x2)=(1,1),(1,2),(2,1),(2,2), zero elsewhere. Determine the conditional mean and variance of X2, given X1=x1, for x1=1 or 2. Also compute E(3X1-2X2).
What does it mean to say that a particular value of x has a z-score of -2.1?
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
Suppose a doctor uses the average x bar for two tests taken about a week apart. what is the probability of x bar less than 3500? C. Repeat part B for n = 3 tests taken a week apart.
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