The Consumer Reports National Research Centre conducted a survey of 1100 adults to learn about their major health-care concerns. The survey results showed that 610 of the respondents lack confidence they will be able to afford health insurance in the future.

1. Develop a 90% confidence interval for the population proportion of adults who lack confidence they will be able to afford health insurance in the future. (4 marks)

[Answer and show workings here]

1. Develop a 95% confidence interval for this population proportion. (4 marks)

[Answer and show workings here]