3. A Developmental Psychologist wants to determine the best method for getting infants to say their first word. The Psychologist recruits a sample of 200 infants (who have yet to say their first word) and their mothers to participate in a research study aimed at identifying how different types of rewards may be related to success in getting infants to say their first word. The Psychologist has mothers offer their infants one of two kinds of rewards while attempting to teach them their first word, an Affection Reward (a hug) or a Snack Reward (a snack). The Psychologist documents both the type of reward used and whether or not the baby was able to utter their first word following training. They would now like to know if the type of reward used (Affection, Snack) was related to whether or not infants were taught to say their first word (yes, no).

a) What is the appropriate analysis to answer this research question. (ie, one-sample t-test, chi-square test for independence, chi-square goodness of fit test, z-score test) Why did you choose this analysis? (2 marks)

b) What are the null and alternative hypotheses for this analysis? (1 mark)