Question

A scientist wants to find the percent of teens that likes the taste of brand X Lemonade over brand y lemonade. She gives each teen a bottle of lemonade with the label showing the brand of each lemonade. She ask each teenager to taste each brand after drinking water in between. She finds their 50% of teens like brand X and 50% like brand y.Why are the results of the survey most likely unreliable

Answer 1

The survey results may be biased due to personal preferences  

Explanation:

The results may be considered as unreliable because there may be people who have already been using any of the two brands. So, most probably they already like it

Since, they already like the brand, there are chances that they will not access properly and give remarks on the basis of their previous use or preference.

Moreover, drinking water in between may also effect the response