9. A population has a mean of u = 80 with o= 20. a. If a single score is randomly selected from this population, how much distance, on average, should you find between the score and the population mean? b. If a sample of n = 100 scores is randomly selected from this population, how much distance, on average, should you find between the sample mean and the population mean?

1. A dog groomer is often asked if small dogs bark more than larger dogs. To test this, he logs the number of separate barking episodes per day for three size dogs: small, medium, and large. In a separate file you will find the number of barking episodes for 12 dogs. On average, small dogs barked the most Mean: 7.25 On average, medium sized dogs barked the least Mean: 2.75 A. Do the different size dogs bark a significantly different number of times? Test with an α = 0.05. B. If appropriate, use Tukey’s HSD post hoc test and report where the differences are. If inappropriate, state why. C. Calculate and interpret the effect size.

20. Consider the following data: 40, 45, 55, 65. ?, ?, 75, 75, 78, 83 Then use the suitable measure to calculate the average and dispersion for the given data.