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A researcher selects a sample of 6 professors, 6 students, and 6 administrators at a local school and has them rate the effectiveness of an innovative new teaching style. In this example, is it possible that the weighted mean ratings will equal the arithmetic mean for the entire sample of 18 participants?
A. No, the weighted mean is never exactly equal to the arithmetic mean.
B. Yes, because there are an even number of participants in each sample.
C. Yes, because the sample sizes are equal in this example.
D. It is not possible to know this without knowing the mean for each sample.
the following list is a sampling of the costs of various statistics textbooks used at several colleges. give the upper
Create the 90% confidence interval for difference in average damage amount for two kinds of SUVs. Interpret this interval.
Calculate correlation coefficient for data below. Compute the equation for regression line if n=7, Ex=69, Ey=528 Exy=4754 and Ex^2=825
Develop a forecasting model, justifying its selection over other techniques, and project attendance through 2007.
a campus club sells 500 raffle tickets at a price of 2 each. the raffle offers one 100 dollar prize two 50 prizes and
To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs.
a recent study by allstate insurance co finds that 82 of teenagers have used cell phones while driving.a state the null
probability based on addition rule.a sample of automobile dealerships found that 19 of automobiles sold are silver 22
When modelling E(y) with single qualitative independent variable, number of 0 - 1 dummy variables in model is equal to number of levels of qualitative variable.
according to an fda research every fourth egg has salmonella bacteria. an inspector checked 4 eggs what is the
To investigate the fluid mechanics of swimming, twenty swimmers each swam a specified distance in a water-filled pool and in a pool where the water was thickened with food grade guar gum to create a syrup-like consistency. Velocity, in meters per sec..
A manufacturer of 35-mm cameras knows that a shipment of 30 cameras sent to the large discount store contains 8 defective cameras. The manufacturer also knows that the store will choose two of the cameras at a random, test them, and accept the shi..
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