Question
In which of the following situations is it reasonable to use the entire population instead of a sample to collect data? A scientist wants to determine the average age of the trees in a national forest, or a store manager wants to know the percentage of customers who prefer cold coffee over hot coffee, a teacher wants to know his student's favorite holiday in all of his math classes, or a university Dean wants to estimate the number of students who work and study at the same time
Answers
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1) A teacher wants to know his students’ favorite holiday in all of his math classes.
2) Yes, because the trees in the sample are chosen randomly. The sample size also appears to be large enough to avoid bias.
3) selecting every tenth employee that enters the building
4) 377 cats
5) The mean points scored increases by 5.1.
6) 2
7) The inpatient employees have a higher median commute to work than outpatient employees.
8) $0.56
9) Sample 3
10) Ron’s record is more consistent, because the range of the miles he biked is lower than Ara’s.
11) Data values in both distributions have similar spread
12) The median number of siblings for students is higher than the median number of siblings for teachers.
13) 12,16, and 19
14) Mean
15) 3,250
16) Line graph
ALL CORRECT ANSWERS
2) Yes, because the trees in the sample are chosen randomly. The sample size also appears to be large enough to avoid bias.
3) selecting every tenth employee that enters the building
4) 377 cats
5) The mean points scored increases by 5.1.
6) 2
7) The inpatient employees have a higher median commute to work than outpatient employees.
8) $0.56
9) Sample 3
10) Ron’s record is more consistent, because the range of the miles he biked is lower than Ara’s.
11) Data values in both distributions have similar spread
12) The median number of siblings for students is higher than the median number of siblings for teachers.
13) 12,16, and 19
14) Mean
15) 3,250
16) Line graph
ALL CORRECT ANSWERS
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