Some states now allow online gambling. As a marketing manager for a​ casino, you need to determine the percentage of adults in those states who gamble online. How many adults must you survey in order to be 95​% confident that your estimate is in error by no more than two percentage points? Complete parts​ (a) and​ (b) below.       a. Assume that nothing is known about the percentage of adults who gamble online.       b. Assume that 17​%

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