An Office Worker Claims That at Most $30 \%$ Of the Phone Calls He Makes Are the Nonbusiness Type

Essay

An office worker claims that at most $30 \%$ of the phone calls he makes are the nonbusiness type. Test the null hypothesis that $p=0.30$ against a one-tailed alternative if a random sample of 13 of his calls reveals 8 nonbusiness calls. Use $\alpha=0.05$ .