STS 204 Assignment
Submission: 3/09/2021
The following data represent a random sample of interface pressure measurements obtained
from a study.
60, 150, 130, 180, 163, 130, 121, 119, 130, 148.
Construct a Box-whisker plot for the data and comment on the normality of the data.
2. A population census reveals that 23% of Ghanaians are
and 12% are > 45 years. Suppose 57 people are
years, 65% are (20 – 45) years
years, 117 are (20 – 45) years and 120 are
> 45 years from a random of Ghanaians. At 1% level of significance, is the sample information
different from that of the population census?
3. A study was conducted to examine the effect of age on the academic performance of students. The data
from the study is given as follows.
Age (years)
< 20
20 - 30
> 30
Academic performance (GPA)
3.5
>3.5
138
64
83
67
64
84
At 1% level of significance, determine whether age has an effect on academic performance.