In a survey of 1070 Canadian adults, 700 say that the energy situation in Canada is very or fairly serious.

1. Find the point estimate for the population proportion.

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2. Construct a 95% confidence interval for the population proportion.

(a) The critical value:

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(b) The margin of error:

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(c) The lower limit of the interval:

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(d) The upper limit of the interval:

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3. find the minimum sample size needed to estimate the population proportion at the 99% confidence level in order to ensure that the estimate is accurate within 4 % of the population proportion.

(a) The critical value:

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(b) The margin of error:

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(c) The sample size: