A research conglomerate is studying social mobility indices…

A research conglomerate is studying social mobility indices (SMI) in the United States. They wanted to determine if different states’ SMIs differs from the established average of 70.4. Four different researchers each drew their own samples from a different state, computed summary statistics from the raw data, and calculated the following 95% confidence intervals:Arkansas: (66.8, 69.2)Arizona: (70.3, 71.3)Montana: (61.0, 80.1)New Hampshire: (74.4, 76.6)Select all states that differ from the established average.

You have collected a sample of 30 measurements from a popula…

You have collected a sample of 30 measurements from a population and want to calculate a 90% confidence interval for the population mean. The sample mean is 75, and the sample standard deviation is 10. What is the margin of error for this confidence interval?