Dentists use of laughing gas. According to the American Dental Association, 60% of all dentists use nitrous

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Dentists’ use of laughing gas. According to the American Dental Association, 60% of all dentists use nitrous oxide in their practice. In a random sample of 100 dentists, let pn represent the proportion who use laughing gas in their practice.

a. Find E1pn 2.

b. Find spn .

c. Describe the shape of the sampling distribution of pn.

d. Find P1pn 7 .652.

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