Question

Suppose you want to estimate the mean GPA of all students at your school. You set up a table in the library asking for volunteers to tell you their GPAs.

a. Will this method produce a representative sample? Why or why not?

b. If there is bias in the experiment, explain what type of bias is present.

c. Design a simple random sample to estimate the mean GPA of all students

Answer 1

A)

No this method will not produce a representative sample because participants are selected based on volunterring . and the results are prone to significant bias, because , the sample may not be representative of all characteristics.

B)

Volunteer bias is a risk of all non-probability sampling methods.Those who volunteer to take part may be different from those who choose not to (volunteer bias)

c)

Random selection of studentsfrom the school. SRS

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