Use the Following Information to Answer the Question

Multiple Choice

Use the following information to answer the question. These two headlines are on the same topic.
Headline A: Married men who gain weight following the birth of their first child dramatically increase their risk of further
weight gain following the birth of more children, a new study suggests.
Headline B: Married male weight gain after the birth of the first child leads to additional weight gain following the birth of
more children, a new study finds.
-An office building janitorial company is interested in the opinions of people who visit the office building on a typical day. He thinks that opinions of people who visit the office building in the
Morning could be different than those who visit later in the day and he does not want a biased
Sample. Which sampling method is likely to result in an unbiased sample?

A) A large sample of people who visit the building that have been stratified by age.
B) A cluster sample of all the people who visit the office building between 8:00 am and 9:00 am and between 5:00 pm and 6:00 pm.
C) A systematic sample of every tenth person who visits the office building throughout the day.
D) None of these.