e Edt View Go Tools Window Help homework 1 (1) pdf (page 3 of 5) 3. In recent ye
ID: 1150538 • Letter: E
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e Edt View Go Tools Window Help homework 1 (1) pdf (page 3 of 5) 3. In recent years, there has been much talk about the way opinion polls are conducted. Consider the following type of poll for the U.S. President's approval rating. A survey is put up on a website. Anyone can visit this site and complete the survey for free. 3a. What is the population of interest? 3b. What is the sample? Is it a random sample? Explain. 3c. Based on the survey responses, you calculate the sample mean approval rating. Is this sample mean unbiased? Explain. MacBook Pro 2 .3Explanation / Answer
Population of interest is Internet using people
Sample is subset of people characterising the general population of people in usa here. No it is not random even though everyone will be linked to website randomly. The reason is that quite often in such samples more of supporters or opposition participates which negates the characteristics of random sample-in random sample each unit of population or sample has equal probability of getting selected
No sample mean is not biased. As shown by part B it usually represents views of only one group. Even other wise in a sample of this type mean will not be unbiased. We will have to check sampling distribution of mean to reach accurate conclusions
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