Exercise 10. A sample data set with a bell-shaped distribution and size ? = 128 hasmean ?̅= 2 and standard deviation ? = 1.1. Find the approximate number ofobservations in the data set that lie:a. Below −0.2b. Below 3.1c. Between −1.3 and 0.9

In a normal curve, the percentage of the scores between one and two standard deviations above the mean is approximately __________.   Select one: a. 14% b. 50% c. It is impossible to tell. d. 2% Clear my choice

The frequency distribution was obtained using a class width of 0.5 for data on cigarette tax rates. Use the frequency distribution to approximate the population mean and population standard deviation. Compare these results to the actual mean u = $1.506 and standard deviation o = $1.004. Click the icon to view the frequency distribution for the tax rates. Frequency distribution of cigarette tax rates Tax Rate Frequency 0.00–0.49 7 0.50-0.99 14 1.00–1.49 7 1.50–1.99 2.00–2.49 5 2.50–2.99 5 3.00–3.49 3.50–3.99 1 4.00-4.49 1

For a random sample of 10 men, the mean head circumferences are x-bar = 57.3 cm, and the sample standard deviation is s = 2cm. what is the standard error of the mean?