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% condent that your estimate is in error by no more than four percentage points? Complete parts (a) and (b) below. (I) a. Assume that nothing is known about the percentage of adults who gamble online. n=D (Round up to the nearest integer.) b. Assume that 19% of all adults gamble online. n=D (Round up to the nearest integer.) Claim: Fewer than 90% of adults have a cell phone. In a reputable poll of 1041 adults, 83% said that they have a cell phone. Find the value of the test statistic. <:> The value of the test statistic is D. (Round to two decimal places as needed.)