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1. Classify the following dataset as sample or population:

a. Twenty students from a class of 100, where the study is about that class as a whole

b. All the households in one suburb for a study on a city

c. A university-wide study where data was collected from all students whose student id

number ends with an even number

d. Twenty students from a class of 20, where the study is about that class as a whole

2. Distinguish between primary and secondary data. In two or three sentences each, propose

two research projects. One where primary data can be used and another where secondary data

can be used.

3. Given the relationships between mean, median and mode in the following, which are

negatively (left), positively (right) or not skewed?

a. Mean = 4.2, mode = 5.6, median = 5.0

b. Mean = 4.0, median = 4.0, mode = 4.0

c. Mean = 5.8, mode = 3.4, median = 4.0

d. Mean = 6.7, median = 6.8, mode = 7.2

e. Mode = 86.7, mean = 102, median = 100