Question

Researchers will conduct a year-long investigation of walking and cholesterol levels in adults. They will

Answer 1

a. Subjects may enter a false information or data, or can even make mistakes while entering the data.

b. The researcher can use the results of the study to make generalization to the entire population.

What is a Bias?

A bias can be defined as the tendency of facts to be distorted or subjective rather than being objective. It's a deviation from the facts.

What is a Representative Sample?

A representative sample can be defined as a sample drawn from an entire population such that it is a subset of it and has similar characteristics as the population group.

a. The bias that could be introduced by keeping journal instead of wearing an activity tracker is that subjects may enter a false information or data, or can even make mistakes while entering the data.

b. The benefit of using a representative sample from the population is that: the researcher can use the results of the study to make generalization to the entire population.

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Answer 2

Answers:

1. Describe what bias could be introduced by keeping the daily journal instead of wearing the activity tracker.

The bias that could be created by the subjects keeping a daily journal instead of wearing the tracker is based in the following possible events:

a) The subjects could fix the data and present false information.

b) The subjects could make mistakes at the time of collecting the data, related to mismeasurements.

2. Explain the benefit of using a representative sample from the population.

First, let's define a "representative population". In statistics, a representative sample is a sample that meets these 3 basic requirements:

1. Each element was selected without any type of bias.

2. Each element was selected randomly.

3. The size of the sample has the minimum amount of elements required for the population. There are defined statistical procedures that determine what the minimum size of the sample should be, based on the size of the population, the mean and standard deviation, and percentage of reliability and error used.

Now, that we have a definition of a representative sample, let's state the benefits of working with one. Among the benefits of using a representative sample, we have the opportunity of extracting values of interest, such as mean, standard deviation and range, that are as close as posible to those of the population. The importance of getting accurate information is to be able to obtain real information about a population and being able to make good decisions based on that information.