A 2015 survey shows that 45% of Snapchat users are between 18 and 24 years old. Suppose a folow-up survey were recently conducted to investigate if the proportion had changed and that out of a random sample of 225 Snapchat users, it found that 123 users wero between 18 and 24 years old Using a = 0.01, complete parts a through c. a. State the null and alternative hypothesis. Let p be the population proportion. Determine the nuli hypothesis, Ho, and the alternative hypothesis, H. Ho: P (Type integers or decimals. Do not round.) b. What conclusions can be made about the proportion of Snapchatters between 18 and 24 years of age? Identity the critical value. (Round to two decimal places as needed.) Calculate the appropriate test statistic. Z,- (Round to two decimal places as needed.) What is the final conclusion? Beiect H. There is not enough evidence to conclude that the proportion of Snapchat users between 18 and 24 years old has changed nid has changed