If the alpha level is changed from α = .05 to α = .01, a. What happens to the boundaries for the critical region? b. What happens to the probability of a Type I error?

2. A person’s blood glucose level and diabetes are closely related. Let x be a random variable measuredin milligrams of glucose per deciliter) 1/10 of a liter) of blood. After a 12- hour fast, the random variable xwill have a distribution that is approximately normal with mean µ = 85 and standard deviation ợ = 25(Source: Diagnostic Tests with Nursing Implications, edited by S. Loeb, Springhouse Press). Note: After 50years of age, both the mean and standard deviation tend to increase. What is the probability that, for an adult(under 50 years old) after 12- hour fast? (a) X is more than 60? (b) X is less than 110? (c) X is between 60 and 110?

2. The average pre-school cost for tuition fees last year was P74,200. The following year, 20 institutions had a mean of P13,100 and a standard deviation of P2,250. Is there sufficient evidence at a = 0.10 level of significance to conclude that the mean cost has increased? Solution: Step 1: State the hypotheses. Ho: H;: Step 2: The level of significance and critical region. a = df = and tertical = Step 3: Compute for the value of one sample t test. teomputed =, Step 4: Decision rule. Step 5: Conclusion.

1. What is the standardized test statistic? t = ___. 2. What is/are the critical value(s)?