Suppose you want to determine if there are differences in the average prices among items at three local supermarket chains.To reduce bias,how should you select the items to use in your study?
A)Choose items which you know are commonly purchased.
B)Randomly select an appropriate number of times from a list of all possible items in the supermarket.
C)Choose only brand-name items.

Question

Quizplus · Accepted Answer

Randomly selecting items from a list of all possible items in the supermarket will reduce bias because it will provide a representative sample of all the items available at the supermarket. Choosing items that are commonly purchased or brand-name items might introduce bias, as they may not represent the full range of products available. Random selection will also ensure that each item has an equal chance of being included in the study, further reducing bias.

Suppose You Want to Determine If There Are Differences in the Average