1. Which of these tests assume that the standard deviation is unknown?
   • The great macaroni test
   • The z-test
   • The t-test
   • Every A/B test
2. Which of the following functions will give the probability of getting values equal or greater than one from a standardized normal distribution?
   • qnorm(1, lower.tail = F)
   • pnorm(1, lower.tail = F)
   • pnorm(1)
   • t.test(1, alternative = 'less')
3. Select the false statement:
   • A/B tests can be used to compare website versions
   • A/B tests can be only used by the web industry
   • Mean is a measure of central tendency
   •  Z-tests assume that the standard deviation is known

Answers—executing the following code will give you the answers to the quiz questions:

set.seed(10)
round(runif(3,1,4))