Behavior Science Research
A researcher studies the average distance that 130 people living in U.S. urban areas walk each week.
What is the size of sample?
The sample size is 130 people.
Identify the population?
The population is people living in U.S. urban areas that walk each week.
Seventy three people are stopped as they leave a popular grocery store, and the number of fruit and vegetable items they purchase is assessed.
What is the size of the sample?
The size of the sample is 73 people.
Identify the population.
The population is people who are stopped leaving a popular grocery store who purchased fruit and vegetable items.
Is the average calculated in Exercise 1, a descriptive statistic or an inferential statistic if it is used to describe the 130 people studied?
The average calculated in exercise 1 is a descriptive statistic. Descriptive statistics is "the term given to the analysis of data that helps describe, show, or summarize data in a meaningful way such that, for example, patterns might emerge from the data." (AERD Statistics, 2012, p.1)
4. Is the number of items counted to Exercise2 a descriptive statistic or an inferential statistic if it is used to estimate the diets of all shoppers?
The average for the 130 people studied is an inferential statistic because inferential statistics are "techniques that allow us to use these samples to make generalizations about the populations...
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