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Question 12 (10 marks total) a. Clearly show how the margin of error that is quoted in the first paragraph was calculated. (2 marks) b. Estimate with a 90% confidence interval the percentage of BC adult residents that agree that "drastic action" is needed right now to save mankind. In your answer: check the conditions, show the details of your CI construction, and interpret your interval. (6 marks) c. How large a random sample of adult Canadians is required to estimate the percentage that feel that they are doing all that they can to help save the environment if the estimate is to be accurate within 2 per cent, 99 times out of 100? In calculating your answer, assume that all Canadians feel about the same on this issue as British Columbians. (2 marks) SUN, Nov. 18, 2006 Quick and drastic action needed to curb global warming, poll told The poll randomly sampled 300 adult B.C. residents, and is considered accurate within plus or minus 5.6 per cent, 19 times out of 20. Pollster Kyle Braid said the results provide "a good snapshot" of the province on the issue of environmental action. In particular, Braid noted that 72 per cent of poll respondents agreed that "drastic action" is required right now to save mankind. The poll - conducted Nov. 10-16 by Ipsos Reid - also found that most B.C. residents give themselves an above-average grade when it comes to assessing their environmental performance, but fewer than 10 per cent of respondents say they are doing all that they can to help.

Question 12 (10 marks total)
a. Clearly show how the margin of error that is quoted in the first paragraph was calculated. (2 marks)
b. Estimate with a 90% confidence interval the percentage of BC adult residents that agree that "drastic action" is needed right now to save mankind. In your answer: check the conditions, show the details of your CI construction, and interpret your interval. (6 marks)
c. How large a random sample of adult Canadians is required to estimate the percentage that feel that they are doing all that they can to help save the environment if the estimate is to be accurate within 2 per cent, 99 times out of 100? In calculating your answer, assume that all Canadians feel about the same on this issue as British Columbians. (2 marks)

SUN, Nov. 18, 2006
Quick and drastic action needed to curb global warming, poll told
The poll randomly sampled 300 adult B.C. residents, and is considered accurate within plus or minus 5.6 per cent, 19 times out of 20. Pollster Kyle Braid said the results provide "a good snapshot" of the province on the issue of environmental action.
In particular, Braid noted that 72 per cent of poll respondents agreed that "drastic action" is required right now to save mankind.
The poll - conducted Nov. 10-16 by Ipsos Reid - also found that most B.C. residents give themselves an above-average grade when it comes to assessing their environmental performance, but fewer than 10 per cent of respondents say they are doing all that they can to help.

Question 12 (10 marks total)
a. Clearly show how the margin of error that is quoted in the first paragraph was calculated. (2 marks)
b. Estimate with a 90% confidence interval the percentage of BC adult residents that agree that "drastic action" is needed right now to save mankind. In your answer: check the conditions, show the details of your CI construction, and interpret your interval. (6 marks)
c. How large a random sample of adult Canadians is required to estimate the percentage that feel that they are doing all that they can to help save the environment if the estimate is to be accurate within 2 per cent, 99 times out of 100? In calculating your answer, assume that all Canadians feel about the same on this issue as British Columbians. (2 marks)

SUN, Nov. 18, 2006
Quick and drastic action needed to curb global warming, poll told
The poll randomly sampled 300 adult B.C. residents, and is considered accurate within plus or minus 5.6 per cent, 19 times out of 20. Pollster Kyle Braid said the results provide "a good snapshot" of the province on the issue of environmental action.
In particular, Braid noted that 72 per cent of poll respondents agreed that "drastic action" is required right now to save mankind.
The poll - conducted Nov. 10-16 by Ipsos Reid - also found that most B.C. residents give themselves an above-average grade when it comes to assessing their environmental performance, but fewer than 10 per cent of respondents say they are doing all that they can to help.

Added by Emilio M.

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