According to eMarketer.com, 36% of mobile phone users in the United States use the Snapchat app at least once a month (data collected for a particular month). A sample of 175 was selected. Complete parts a through d. a. Calculate the standard error of the proportion. .0363 (Round to four decimal places as needed.) b. What is the probability that less than 30% of mobile phone users used Snapchat? The probability is .0495. (Round to four decimal places as needed.) c. What is the probability that between 28% and 40% of mobile phone users used Snapchat? The probability is 0.8511. (Round to four decimal places as needed.) d. What impact would changing the sample size to 250 Snapchat users have on the results of parts a, b, and c? The standard error of the proportion would because increasing the sample size would the standard error of the proportion. The part b probability and the part c probability