Auniversity department administers a survey, regarding student satisfaction. based on the survey results, the department provides a confidence interval
estimate of 60% to 80% for student satisfaction. if the department wishes to
construct a confidence interval that more accurately represents the
proportion of student satisfaction, how should the design be altered?

a. use a smaller confidence level

b. use a smaller sample size

c. use a larger confidence level

d. use a larger sample size