Practice: A researcher wants to see if the students currently in your university are either older or younger than students from 10 years ago, who were 25-years-old on average. What are your null and alternative hypotheses?

Concept #1: Determining the Null and Alternative Hypotheses

Concept #2: Determining the Null and Alternative Hypotheses: Intro

Practice: A researcher wants to see if the students currently in your university are either older or younger than students from 10 years ago, who were 25-years-old on average. What are your null and alternative hypotheses?

Practice: Referring to Practice 1, what would a Type II error be?

Practice: Referring to Practice 1, if the researcher concluded that the mean age of current students is different from 25, what type of error could have occurred and what is the probability of that error?

Practice: You know coffee affects word recall. If it is known that the average number of words people can recall is 7 and you want to see if people who drink coffee recall a greater number of words, what are your null and alternative hypotheses?

Practice: Referring to Practice 4, if you concluded that coffee improves memory, and coffee actually doesn’t improve memory, what type of error has occurred?