Anne believed that due to problems in obesity , the averge life expectancy for c

Question

Anne believed that due to problems in obesity , the averge life expectancy for countries was decreasing to determine this, Anne selected a random sampleof 30 countries and recorded the life expectancy for 29 countries that had data, she then found the average life expectancy for the 29 countries. 

please find the following

1) the unit in Anne's study is:

a) a country
b) a person
c)the 30 countries
d)the life expectancy

2) what is the sample for this study ?

3) what type of sampling design did anne use ?

4) since only 29 countries had information available, what potential bias could this study have ?

Explanation / Answer

1. Units are often referred to as being either experimental units, sampling units or unitsof observation: An "experimental unit" is typically thought of as one member of a set of objects that are initially equivalent, with each object then subjected to one of several experimental treatments.

Hence unit here is d. The life expectancy

2. 30 countries is the sample

3. Random sampling is been used.

4. This is undercoverage bias.

In survey sampling, undercoverage is a type of selection bias . It occurs when some members of the population are inadequately represented in the sample.

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