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Quick Quiz

Quick Quiz

Home Quick Quiz

Quick Quiz

Take this quick quiz of some key points in statistics!

Step 1 of 6

16%
Economists reviewing certain income data determine that it is not normally-distributed, so they decide to standardize it and convert it to z-scores. As a result,
A research firm has just completed an opinion survey using a sample of 250 voters in Menlo Park CA (pop. 33,000). Now they plan to do the same survey in Palo Alto CA (pop 66,000). How many voters should they sample in Palo Alto to achieve about the same degree of accuracy as in Menlo Park?
A blog serving the music business is worried about declining subscriptions and finds that it does not have good information about how many people are canceling, and when. It randomly selects 100 current subscribers for closer study, and finds that 5 of them had canceled at the end of one month. So the estimated cancellation rate is 5% per month. Which of the following procedures might be used in establishing possible sampling error in this 5% estimate?
Consider the reviews that you read of products and services that you read online, say on Amazon or Yelp. Which of the following is true?
Suppose a web site gets 5000 visitors in a week, and 100 of them click on a product link. Of the ones who click on the product link, 8 purchase the product. What is the (a) unconditional (simple) probability of a visitor making a purchase, and (b) the probability of a visitor making a purchase, conditional on clicking on the product link?

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