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What is the definition of an "independent" variable? A dependent variable?
What about a variable I intend to use to help do some forecasting. Interest rates, for example, will have an effect on the number of houses purchased --- may I call interest rate the independent variable and number of houses purchased the dependent variable?
In a "scatter plot" which axis is the independent variable put on? The dependent variable?
How many treatments are there? What is the total sample size? Is there a significant difference at the 5% Level of significance? Would I accept or reject the null Hypothesis.
Mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours. Based on this information, what would be the point estimate for μ?
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products.
Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.
The store manager is under impression that his sales people do more business if they score higher on the social skills test which was administered this year. 5 victims were selected at random. Below, the results are X =test score, Y =weekly sales ..
If they would like to estimate the true average time to within 1.9 minute (with 95% confidence) what sample size should they use? (remember to round to the next largest integer.)
How does your sample compare to this theoretical distribution of sample means and what are the mean, variance, and standard deviation of the observations in your sample?
Say, for example, the correlation is 0.75 between Height (measured in inches) and Weight (measured in pounds). If Height were changed to being measured in centimeters (where 1 inch = 2.54 centimeters) what effect would this have on the correlation..
A fast-food restaurant sells hamburgers and chicken sandwiches. On a typical weekday, the demand for hamburgers is normally distributed with a mean 313 and a standard deviation 57; the demand for chicken sandwiches is normally distributed with a m..
Find the conditional probability that a randomly chosen person from this population will contract both diseases, given that he or she has contracted at least one disease.
Suppose that a certain college class contains 45 students. Of these, 26 are sophomores, 25 are chemistry majors, and 7 are neither. What is the probability that the student is both a sophomore and a chemistry major?
What is the effect of child care on the security of attachment which develops between infant and caregiver. You suspect that infants in child care will be insecurely attached at 11 months after being in a child care from 2 months of age,
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