Question

In a survey of 920 Canadian adults, 780 say that the energy situation in Canada is very or fairly serious.

1. Find the point estimate for the population proportion.

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

(a) The critical value:

(b) The margin of error:

(c) The lower limit of the interval:

(d) The upper limit of the interval:

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:

(b) The margin of error:

(c) The sample size:

Answer 1