HypothesisTests: Problem 10 (1 point) It is claimed that the average Canadian family spends 22 percent of their disposable income on food. In a random sample of 960 families, the mean proportion of disposable income spent on food was 21 percent. Conduct the the hypothesis that P, the proportion of disposable income spent on food, is 22 percent against the alternative hypothesis that it is less than 22 percent. Conduct a test using a=.05. What is the value of the standard score: standard score: The final conclusion is A. We can reject the null hypothesis that P = 22. B. There is not sufficient evidence to reject the null hypothesis that P = 22.