Question 1
Researchers have claimed that the average number of headaches per student during a semester of Statistics is 10. Statistics students believe the average is higher. In a sample of
n = 24 students the mean is 15 headaches with a deviation of 2. Which of the following represent the null and alternative hypotheses necessary to test the students' belief?
◦
H0:
μ = 10 vs.
Ha:
μ ≠ 10
◦
H0:
μ = 10 vs.
Ha:
μ > 10
◦
H0:
μ < 10 vs.
Ha:
μ = 10
◦
H0:
μ = 10 vs.
Ha:
μ < 10
Question 2
A consumer product magazine recently ran a story concerning the increasing prices of digital cameras. The story stated that digital camera prices dipped a couple of years ago, but are now beginning to increase in price because of added features. According to the story, the average price of all digital cameras a couple of years ago was $215.00. A random sample of cameras was recently taken and entered into a spreadsheet. It was desired to test to determine if that average price of all digital cameras is now more than $215.00. What null and alternative hypothesis should be tested?
◦ H
0: μ = 215 vs. H
A: μ ≠ 215
◦ H
0: μ = 215 vs. H
A: μ < 215
◦ H
0: μ ≥ 215 vs. H
A: μ < 215
◦ H
0: μ = 215 vs. H
A: μ > 215
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