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Sampling and Sampling Methods
RoboCall Study: The research goal is to determine the average number of robocalls received each day by adults in Pennsylvania. Presented below are four potential options for collecting a sample for the RoboCall study. Determine which one of the four potential options shown below is most likely to result in a representative sample and explain why. Then explain why each of the other three choices are not likely to result in a representative sample for the RoboCall study. Insert your answers immediately below each of the four Sampling Methods presented below. In preparing your answer, include the following terms:
Sampling Method 1:
The 537 adults in Pennsylvania who respond to a survey published in a newspaper.
Sample Method 2:
The first 537 people to visit a particular Philadelphia grocery store on a Sunday.
Sample Method 3:
A set of 537 Pennsylvanians with phone numbers randomly selected from a list of all phone numbers in Pennsylvania.
Sample Method 4:
A set of 537 Pennsylvanians randomly selected from a list of all licensed car owners in Pennsylvania.
The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described with a Normal model.
In heavy construction operations the variation in individual vehicle cycle times can cause delays in the total process. Find the sample means
We are testing the effects of an advertising campaign. We survey 36 people and find that they spent on average $30 more on our product with a sample standard
If it's appropriate, find a 90% confidence interval for the proportion of houses in this zip code that have swimming pools. If it's not appropriate, explain and/or recommend an alternative action.
The U.S. Product Safety Commission issues playground specifications and guidelines to help communities build safe playgrounds.
an american roulette wheel has 38 slots 18 are red 18 are black and 2 are green. let r be the number of spins until you
The design tolerance thickness for an automotive part is 55 mm to 65 mm. If the process mean thickness is 61 with a standard deviation of 2.3 mm, then what percentage of the sheets will be acceptable? (i.e. What percentage will fall within the des..
Internet Recruiting The percentage of fortune Global 500 firms that actively recruited workers on the internet from 1998 through 2000 can be modeled by P(x) = 26.5x - 194.5 percent, where x is the number of years after 1990.
Assume that the event of Harold making it on time is independent of the event of Maude making it on time. What is the probability that only Harold will make it to the cruise?
What percentage of the bulbs have lifetimes that lie within 2 standard deviations to either side of the? mean?
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
during the past six months 73.2 of us households purchased sugar. assume that these expenditures are approximately
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