Calculate z-statistic of a population proportion.

A research study claims that 68% of adults drink regularly. Edward conducts a random sample of 200 people and finds that 140 people drink regularly.

Using the formula and data provided, what is the value of the z-test statistic? Answer choices are rounded to the hundredths place.

• a.)0.41
• b.)0.59
• c.)0.39
• d.)0.61