The 2004 General Social Survey foud that 78.9% of the adult Americans interviewed caimed to have given a financial contribution to charity in the previous twelve months.

a. Describe the parameter value of interest in this situation.

b. If the survey had involved 250 households, determine a 99% confidence interval for this parameter.

c. Repeat part b, supposing the survey had involved 500 households

d.Repeat part b, supposingthe survey had involved 1000 households

e.Repeat part b, supposingthe survey had involved 2000 households

f. Compare the margins-of-error for these four intervals. Describe how they are related.

g. Does doubling the sample size cut the margin-of-error in half? If, not by what factor does the sample size have to be increased in order to cut the margin-of-error in half?

h. The actual survey involved 1334 households. Determine and interpret a 99% confidence interval for the parameter.