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Twenty students agreed to participate in a study on colds. Ten were randomly assigned to receive vitamin C, and the remaining 10 received a tablet that looked and tasted like vitamin C but in fact contained only sugar and flavoring. The students did not know whether they were taking vitamin C or not, but the investigators did.
The students were followed for 2 months to see who came down with a cold and who didn't. Explain whether each of the following terms applies to this randomized experiment.
a. Placebo.
b. Single-blind.
c. Double-blind.
d. Matched pairs.
e. Repeated measures.
f. Replication.
An industrial engineer at Lyons Products would like to determine whether there are more units produced on the afternoon shift than on the morning shift.
the diameters of a new species of apple have a bell-shaped distribution with a mean of 7.26cm and a standard deviation
according to the u.s. bureau of labor statistics self-employed persons with home-based businesses work an average of 23
consider column buckling on an aluminum 6061-t6 rectangular tube with 2 4 outer dimensions and 0.5 wall thickness.
A sample of 65 observations is selected from one population with a population standard deviation of 0.75. The sample mean is 2.67.
The regional tupperware dealers earned these commissions last month: what was the mean commision earned? round your answers to the nearest cents.
the salinity in the ocean is expressed in parts per thousand ppt. during november 2008 the mean salinity in a region of
in its fuel economy guide for model year 2010 vehicles the environmental protection agency gives data on 1101 vehicles.
the number of carbohydrates in grams per 8-ounce serving of yogurt for each of a random selection of brands is listed
Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
Write the regression. Interpret the regression constant and regression coefficient. Forecast a value for monthly salary.
for a population with a mean of 80 and a sd 12 find the z-score corresponding to each sample mean.m83 for a sample of
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