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A pollster for the Public Policy Institute of Califor- nia explains how the Institute selects a sample of Califor- nia adults ("It's About Quality, Not Quantity," San Luis Obispo Tribune, January 21, 2000):
That is done by using computer-generated random residential telephone numbers with all California pre?xes, and when there are no answers, calling back repeatedly to the original numbers selected to avoid a bias against hard-to-reach people. Once a call is completed, a second random selection is made by asking for the adult in the household who had the most recent birthday. It is as important to randomize who you speak to in the household as it is to random- ize the household you select. If you didn't, you'd primarily get women and older people.
Comment on this approach to selecting a sample. How does the sampling procedure attempt to minimize certain types of bias? Are there sources of bias that may still be a concern?
The correlation between his test and the BDI was r =.14. Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
the sylvan pharmaceutical company makes tubes of antibacterial cream that are labeled as containing 4 ounces. in
use this calculation table for the chi-square test for goodness-of-fit to complete this
Use the sales forecaster's, predictions to describe a normal probability distribution that can be used to approximate the demand distribution.
What are the odds against drawing a card from an ordinary deck of cards and getting a spade?
in a certain community 30 of the families own a dog and 20 of the families that own a dog also own a cat. it is also
What is the 99% confidence interval, if the population standard deviation is known to be 10 days? What is the 99% confidence interval, if the sample standard deviation is 10 days?
What is the difference between the Confidence Interval and the Prediction Interval given in a Minitab printout of a multiple regression? When do you use each?
Analyze how the level of measurement and the distribution of the data influenced the type of graphical descriptions presented.
Test hypothesis that Site B is more successful in initiating acquaintances than Site A. Use alpha = .05.
the number of people living in a hypothetical large canadian city is reported by age groups in the following table.age
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
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