Question

BC residents by mail and 4.7% of the surveys a ✓ [Select ] Convenience sampling bias Undercoverage Sampling error Stratified random sample Voluntary response bias Bad sampling frame Nonresponse bias None of the other answers I in a newspaper ns about pipeline For each of the following situations, choose which type of bias we should be most concerned about: 1. A survey about ride-sharing services is sent out to a randomly selected sample of BC residents by mail and 4.7% of the surveys are returned: → [ Select] 2. A pipeline company runs an ad in a newspaper asking people to sign in to their website to record their opinions about pipeline expansion: → Voluntary response bias 3. A public opinion survey selects names from a city telephone → [Select ] 4. A marketing survey from a Vancouver-based clothing company that employees are asked to give to their friends and families: → [Select]

Answer 1

1.

Since the responses in the survey is very low (4.7%), the bias is,

Nonresponse bias

2.

Since the sample members are self-selected volunteers to record their opinions on website, the bias is,

Voluntary response bias

3.

People not listed in the city phone directories are not selected. The bias is,

Undercoverage

4.

Friends and families are easy to reach. Thus the bias is,

Convenience Sampling Bias