4.106 Multiple choice: Emotional health survey An Intenet poll conducted in the

Question

4.106 Multiple choice: Emotional health survey An Intenet poll conducted in the United Kingdom by Netdoctor.co.uk asked individuals to respond to an 'emotional health survey (see ics ICS ICs ics ked htm). There were 400 volunteer respondents. Based on the results, the British Broadcasting Corporation (BBC) reported that Britons are miserable ir's official'This conclusion refiected the poll responses, of which one quarter feared a-hopeless future," one in three felt-downright miserable," and neary one in ten thought their death would make things better for others. Which of the following is not correct about why these results may be misleading? a. Many people who access a medical Web site and are willing to take the time to answer this questionnaire may be having emotional health probiems b. Some respondents may not have been truthful or may have bden Internet surfers who take pleasure in filing out ency ssion a questionnaire multiple times with extreme answers c. The sample is a volunteer sample rather than a random sample. d. it's impossible to learn useful results aoout a population from a sample of only 400 people ics

Explanation / Answer

Option a suggests that the people who access a medival Website and are willing to take the time to answer the questionnaire may be having emotional health problem which is true since the mediacally and metally healthy person might not visit the medical website which makes this sample of 400 respondent not a random sample. And since the sample is not random it is bound to have some bias this makes the option c true as well. While option b is just true because those things might happen

But if the sample of 400 people is completely random than there might be no biases regarding the poll and we can make inferences for the whole population from that random sample.

So our correct answer is

Option (d) it's impossible to learn useful results about a population from a sample of only 400 people

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