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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.
The heights of young women are approximately normal with mean 65 inches and standard deviation 2.5 inches.
Create a histogram over five class intervals.
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
If code is 4 random letters, and letters can be utilized multiple times, how many different possible codes are there?
Is there evidence of difference in mean life of bulbs produced by the two kinds of machines. What is your conclusion?
Perform the appropriate test for a difference in mean blood glucose and report the p-value for the two-tailed test of significance, assuming that the variances are equal.
Determine odds student gets more than 14 questions correct? Determine the odds student gets exactly 12 questions correct?
What should ING's General Counsel do to minimize ING's expected costs?
I want to establish if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
A restaurant monitors its customer's complaints, With information, which of the following is a Pareto chart of the data?
Plot fitted values against residuals. Does this plot point out any problems with homoscedasticity?
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