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1. What is the coefficient of determination and what does it tell us about the relationship between two variables?
2. For a set of data, r2 is 0.64 and the variables x and y are inversely related. What is the numerical value of r?
Why is cohort studies more expensive than case-control studies? I know one problem is cohort studies often must be followed up for a long period to determine whether the outcome of interest has developed and they are more expense than case-control..
If θ1 and θ2 are unbiased estimators of θ, show that θ3=k1θ1+ k2θ2 is biased estimator of θ. What condition must be imposed on constants k1 and k2, so that θ3 is an unbiased estimator of θ?
Based on the scatter diagram developed, do you expect a relationship between Total Cost and Production Volume? Indicate the expected type of relationship ifany.
Find the probability that fewer than 7 are satisfied. c) Find the probability that 8 or more are satisfied. d) Find the probability that between 4 and 7 are satisfied with the airline.
The amount of milk that the American Cookie Company sells in a given week is random. Suppose the milk sells for $2.00 per cup and it costs the store $1.50 per cup. What is the expected number of cups of milk the store will sell in a given week
Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent and that they have been randomly selected.
You have been asked by your supervisor to provide business intelligence related to a problem about a disease or health condition in your department. Brief description of the current state of the problem or issue
An investigator wants to show that first-born children score higher on IQ tests than second-borns. He takes a simple random sample of 400 two-child families in a school district, both children being enrolled in elementary school. He gives these ..
Suppose you have developed a regression model to explain the relationship between y and x1, x2, and x3. The ranges of the variables you observed were as follows: 10 y 100, 5 x1 55, .5 x2 1, and 1,000 x3 2,000. Will the error of prediction be smal..
Compute the skewness for your data set using Pearson's
Explain the different types of measurement scales and give examples in the following situations:- Gallons of water to put out a fire by the fire department
Let (S, d) be any noncompact metric space. Show that there exist bounded continuous functions fn on S such that fn (x ) ↓ 0 for all x ∈ S but fn do not converge to 0 uniformly. Hint: S is either not complete or not totally bounded.
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