Kellys Lawn Care Service is a regional provider of lawn care service. Kelly sampled 100 customers, and 70 percent of customers recommended Kellys lawn care service to a neighbor. a. Build a 95% confidence interval for the population proportion of lawn care referrals. b. Build a 99% confidence interval for the population proportion of lawn care referrals. c. If we wanted the margin of error to be 5% (.05), then what should our sample size be? We want a 95% confidence interval. d. If we wanted the margin of error to be 1% (.01), then what should our sample size be? We now want a 99% confidence interval