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Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
a) A complete list of all smokers is somehow compiled and every 1000th name is selected
b) At the next New York City marathon, a survey is conducted of all runners.
c) Fifty different grocery store owners are randomly selected, and all of their customers are surveyed.
d) A computer file of all smokers is compiled and they are all numbered consecutively, then a random numbers generated by computer are used to select a sample of 1000 smokers.
e) All of the smokers' zip codes are collected, and 5 smokers are randomly selected from each zip code.
Compute and interpret each of the statistics in parts(a) through (f) Mean and Median.
Assume the data for the three groups are independent and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that
Formulate the hypotheses that can be used to test the validity of the brokerage firm executive's claim.
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
Sketch the distribution of sample means for sample of n = 25 scores from this population.
The number of standard errors that the sample estimate (p 1 - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
Recent actual and forecasted data for product XYZ is given in the following table.
Use Bayes's rule to find the conditional probability that Julianne is a carrier, given that she and Jason have one child who does not have cystic fibrosis.
In the real world, a given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject the null hypothesis.
Which of the following(s) can be considered (a) variable(s)?
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
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