1.​ Has the number of people living in the average American household increased?
2.​ Time
3.​ Nominal
4.​ The number of people in an American household
5.​ Interval
6.​ 1 sample
7.​ 10
8.​ Between subjects design
9.​ Mean and standard deviation because the research question is comparing the
average number of people in a household, so these measures of central
tendency would be the most significant.
10.​Yes
11.​Interpretation: The researcher predicted that the number of people in the average
American household has increased from 2018 to 2020. On average, the number
of people living in an American household in 2020 (x=2.9, s=1.66) is higher than
the number of people living in an American household in 2018 (x=2.63).
According to the null hypothesis testing, we retain the null and conclude that the
difference is not statistically significant (t(9)=0.51, p>0.01).