For Exercises 5 through $20,$ perform each of the following steps.
a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Compute the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.
Youth Smoking Researchers suspect that $18 \%$ of all high school students smoke at least one pack of cigarettes a day. At Wilson High School, a randomly selected sample of 300 students found that 50 students smoked at least one pack of cigarettes a day. At $\alpha=0.05$ test the claim that less than $18 \%$ of all high school students smoke at least one pack of cigarettes a day. Use the $P$ -value method.