Discuss the following:
Q1. Approximately ______ of the area (cases or observations) under the normal curve is found between 1 standard deviation above and 1 standard deviation below the mean.
Q2. What percentage of area (or cases or observations) is found above a z value of 1.96? ._____
Q3. A random sample of 20 observations is drawn from a population with a standard deviation of 677. Calculate the standard error of the mean.
Q4. Under what condition do you calculate the t statistic?
Q5. Under what condition do you calculate the z statistic?
Q6. Define Type I error. Define Type II error:
Q7. A _____________ table is a classification tool that reveals the various possibilities in the comparison of two variables