Percent confidence interval for the percentage

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In each of 4 years a random sample of 100 voters (different each year) are asked if they support a political party. The numbers each year who support the party are 41, 32, 35, and 33.

(a) Give a 95 percent confidence interval for the percentage who sup- port the party in the first year.

(b) Give a 95 percent confidence interval for the change in the per- centage who support the party between the first and second years.

(c) Can you conclude that support for the party is constant over the 4 years? Explain.

Reference no: EM131332650

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