A commercial claims that 8 out of 10 dentists
recommend a certain brand of toothpaste. to test this
claim, a random sample of 85 dentists is obtained. of
these 85 dentists, 73 indicated that they recommend that
brand of toothpaste. using a significance level of 5%,
test the claim to see if the proportion of dentists who
recommend this toothpaste is not 8 of 10.