A research team conducted a study of VARIABILITY in students' test performance. Researchers assume that individual records are normally distributed with unknown mean and variance. They collected a...

Extracted text: A research team conducted a study of VARIABILITY in students' test performance. Researchers assume that individual records are normally distributed with unknown mean and variance. They collected a sample of n = 16 test scores with summaries shown below. Sample Mean = X = 70.8 and Sample SD = S = 12 1. At the significance level, a = 0.05, do researchers have sufficient evidence that the POPULATION VARIANCE would be BELOW 300? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision 2. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be ABOVE 80? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision Solution