HW20 Save progress Do Score: 12/20 12/16 answered Question 10 0/1 pt 9 Preliminary studies have concluded that about 67% of people would like a wifi connection in their car. (a) Use the given preliminary estimate to determine the sample size required to estimate the proportion of adult Americans who would like wifi capabilities in their car to within 4.5% with 95% confidence. Enter an integer or decimal number [more..] (b) How would the interval be affected if 9% confidence interval was desired? The interval would get larger (c) Use the given preliminary estimate to determine the sample size required to estimate the proportion of adult Americans who would like wifi capabilities in their car to within 4.5% with 9% confidence. Question Help: B Written Example D Post to forum