• Please write down your answer clearly. Show your work for calculation questions.
• The homework assignment is due at the start of class on Wednesday, Dec 11th. Feel free to turn in assignment early. Homework will not be accepted over email.
Q1. The example of an appropriate null hypothesis is that "the mean of population/sample is equal to/greater than/less than 55." (Choose the right word.)
Answer:
Q2. A Type I error is committed when you reject/don't reject a null hypothesis that is true/false. (Choose the right word.)
Answer:
Q3. If a researcher rejects a false null hypothesis, she has made a correct decision/Type I error/Type II error, and if a researcher does not reject a false null hypothesis, she has made a correct decision/Type I error/Type II error. (Choose the right word.)
Answer:
Q4. Researchers determined that 60 tissues is the mean number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: $X = 52$, $S = 22$. Give the null and alternative hypotheses to determine if the number of tissues used during a cold is less than 60.
Answer: $H_0$:
and $H_a$: