A survey commissioned by the Southern Cross Healthcare Group reported that 16% of New Zealanders consume five or more servings of soft drinks per week. The data were obtained by an online survey of 2006 randomly selected New Zealanders over 15 years of age.

a. What number of survey respondents reported that they con-

sume five or more servings of soft drinks per week?

b. Find a 95% confidence interval for the proportion of New Zealan-

ders who report that they consume five or more servings of soft

drinks per week.

c. Convert the estimate and your confidence interval to percent-

ages.

d. Discuss reasons why the estimate might be biased.