A country's education department reported that in

2015,

69.8%

of students enrolled in college or a trade school within

12

months of graduating high school. In

2017,

a random sample of

153

individuals who graduated from high school

12

months prior was selected. From this sample, 99

students were found to be enrolled in college or a trade school. Complete parts a through c.

a. Construct a 90% confidence interval to estimate the actual proportion of students enrolled in college or a trade school within

12 months of graduating from high school in

2017.

The confidence interval has a lower limit of

and an upper limit of=

(Round to three decimal places as needed.)

b. What is the margin of error for this sample?

The margin of error is=

(Round to three decimal places as needed.)

c. Based on this sample, is there any evidence that this proportion has changed since

2015?