Question

A survey conducted five years ago by the health
center at a university showed that 18% of the
students smoked at the time. This year a new survey
was conducted on a random sample of 200 students
from this university, and it was found that 40 of them
smoke. Do these data provide convincing evidence to
suggest that the percentage of students who smoke
has changed over the last five years?

Answer 1

Step-by-step explanation:

Correct answer is

Z = 2.58

P-value = 0.00988

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Answer 2

Answer:

step by step explanation

correct answer is

z = 2•58

p- value = 0.00988