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A residential treatment facility tests a new group therapy for patients with self-destructive behaviors. The therapists hope to decrease scores on a measure of self-destructive behaviors that has a mean in the overall residential treatment population of 35 and a standard deviation of 4.7. The mean score for the patients after the new group therapy is 27. What is the effect size of the new group therapy?
let x be the amount of premium gasoline in 1000 gallons that a service station has in its tanks at the beginning of a
Explain how you would settle on a reasonable level of significance for your scenario. Also explain what the type I and II errors would be if you reached the incorrect conclusion in your test.
The number of gallons (measured in thousands of gallons) that this gas station sells per week. If Y = 340 - 90X, what is the expected value of the random variable Y?
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
suppose that replacement times for washing machines have a mean of 9.3 years and a standard deviation of 1.1 years.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
1. a severe drought affected several western states for 3 years. a christmas tree farmer is worried about the droughts
Zip codes. holes-r-us, and internet company that sells piercing jewelry,
The following table is based on information taken from the Medical Practice Characteristics section of the Statistical Abstract of the United States
multiple choice questions based on multiple regression.1. a regression model between sales y in 1000 unit price x1 in
Let the random variable X represent the number of defective DVD players among 200 randomly selected DVDs of this type. Does the random variable X have a binomial distribution or a Poisson distribution?
A sample of 40 observations is selected from one somewhat normal population. The sample mean is 102 and the sample standard deviation is 5.
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