Suppose that insurance companies did a survey. They randomly surveyed 450 drivers and found that 300 claimed they always buckle up.

Suppose that insurance companies did a survey. They randomly surveyed 450 drivers and found that 300 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up. 

NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) 

A.

• (i) Enter an exact number as an integer, fraction, or decimal.
• x = ______ 

• (ii) Enter an exact number as an integer, fraction, or decimal.
• n = ______

• (iii) Round your answer to four decimal places.
• p' = ______(rounded to four decimal places)

B. 

P'

C.

State the confidence interval. (Round your answers to four decimal places.) 

(______ , ______)

D.