STAT 200 PSU Quiz 9 STAT 200 PSU Quiz 9

1.

A one-way analysis of variance will be done to compare systolic blood pressures in three different age groups. What is the correct statement of the null hypothesis?

[removed]A) μ₁ = μ ₂ = μ ₃ 
[removed]B) μ ₁ ≠ μ ₂ ≠ μ ₃ 
[removed]C) x-bar₁ = x-bar₂ = x-bar₃ 
[removed]D) x-bar₁ ≠ x-bar₂ ≠ x-bar₃ 

Feedback: The null hypothesis for an ANOVA test is that all population means are equal.

2.

A student wanted to test whether there was a difference in the mean daily hours of study for students living in four different dormitories. She selected a random sample of 50 students from each of the four dormitories. What is the null hypothesis for this situation?

[removed]A) The mean daily hours of study is 3 hours for each dormitory. 
[removed]B) The mean daily hours of study is the same for each dormitory. 
[removed]C) The mean daily hours of study is different for each of the 200 students in the sample. 
[removed]D) The mean daily hours of study is not the same for all four dormitories. 

Feedback: ANOVA tests a null hypothesis that the means (average) are equal.