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Random digit telephone dialing. An opinion poll in California uses random digit dialing to choose telephone numbers at random. Numbers are selected separately within each California area code. The size of the sample in each area code is proportional to the population living there.
(a) What is the name for this kind of sampling design?
(b) The California area codes are
Another California survey does not call numbers in all area codes but starts with an SRS of 10 area codes. Choose such an SRS. If you use Table B, start at line 123.
the following information gives the number of days absent from work for a population of 5 workers at a small factory.
In teaching the role of statistical application in Health Science, the importance of reliable and valid data is very critical in research process.
Suppose a social worker is involved in a study about family structure. She obtains information regarding the number of children per family in a certain community from the census data. What is the random variable of interest? Is the random variable..
In November 2009, 65% (0.65) of Americans favored the death penalty for a person convicted of murder. In November 2010, 1025 adult Americans were asked by the Gallup organization,
When demand cannot be met during any given interval, a second window is opened. What percentage of the time will a second window have to be opened?
A store has determined that 25% of all sales are credit sales. A random sample of 75 sales is selected. What is the probability that the sample proportion will be:
Assuming independence of outcomes, find the mean and standard deviation of the consultant's total profit from these three projects.
Four components of a time series are secular trend, cyclical variation, seasonal variation, and irregular variation (Lind, 2005). Briefly describe each of these components and provide a real-world example of one component.
in a survey of women in a certain country ages 20-29 the mean height was 64.1 inches with a standard deviation of 2.99
assume that a random sample is used to estimate a population p. find the margin of error e that corresponds to the
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
Test at the 2.5% significance level whether the variance of the particle diameters of all particles in 220-rated sandpaper is greater than 2.0 micrometers.
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