A paper company wants to survey its employees about a new policy on sales commissions. Which of the following would result in a stratified random sample?
Give a survey to everyone who was eating lunch in the break room that day,
O Randomly select 2 people from each department (sales, customer service, accounting, etc.)
O Put everyone's name on a slip of paper and randomly pull out 10 names.
O Using an alphabetized list of employees, randomly select a starting point and survey every 4th person after that.
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Walgreens sells both kleenex and nyquil. in a random sample of 5000 purchases, it was found that 1200 contained kleenex and 540 contained nyquil. these are not independent because sick people are more likely to buy both and healthy people more likely to buy neither. in looking into that, it was found that 360 purchases contained both. a. make a two-way table to display this information. fill in the table with the missing entries, and be sure your table has row and column totals. b. if we randomly select a purchase that contained kleenex, what is the probability it also contained nyquil? c. what percent of all purchases didn’t contain either product?