# Question: A random sample of 212 Canadian Internet users reveals that

A random sample of 212 Canadian Internet users reveals that they visited an average of 1,576 web pages per month.

a. Assume the standard deviation from the sample was 521. Construct a 95% confidence interval estimate of the average number of web pages visited per month by Canadian Internet users.

b. Assume the standard deviation from the sample was 321. Construct a 95% confidence interval estimate of the average number of web pages visited per month by Canadian Internet users.

c. Assume the standard deviation from the sample was 201. Construct a 95% confidence interval estimate of the average number of web pages visited per month by Canadian Internet users.

d. Compare the three intervals you created for parts a, b, and c of this question. What hap pens to the width of the confidence interval as the variability in the data decreases?

a. Assume the standard deviation from the sample was 521. Construct a 95% confidence interval estimate of the average number of web pages visited per month by Canadian Internet users.

b. Assume the standard deviation from the sample was 321. Construct a 95% confidence interval estimate of the average number of web pages visited per month by Canadian Internet users.

c. Assume the standard deviation from the sample was 201. Construct a 95% confidence interval estimate of the average number of web pages visited per month by Canadian Internet users.

d. Compare the three intervals you created for parts a, b, and c of this question. What hap pens to the width of the confidence interval as the variability in the data decreases?

## Answer to relevant Questions

Refer to the information in Exercise 3a above. a. How large a sample would be required to estimate the average number of web pages visited per month by Canadian Internet users to within 100 pages, with 95% confidence? b. How ...A car manufacturer, worried about how increasing gasoline prices are going to affect sales, wants to estimate the percentage of the adult population in Canada who would consider buying a hybrid vehicle for their next ...An advertising agency wants to analyze the impact of a new advertisement about HDTVs (high definition televisions). The agency selects a random sample of potential consumers of the televisions, and asks them to rate their ...The Student Services Department at a Prince Edward Island college wants to see whether there are differences in the study habits of male and female students. A random sample of female students is selected, and then a ...Repeat the analysis for Exercise 15 above, but this time assume the differences are not normally distributed. In exercisePost your question