A researcher wanted to determine the effect of noise volume on pitch perception. Performance on a pitch perception task was measured after either prolonged exposure to one of four white noise levels: 20 decibels, 40 decibels, 60 decibels, 80 decibels. The dependent variable was task accuracy (number of correct trials out of 15). The data is below:

20 decibels 40 decibels 60 decibels 80 decibels

10 8 7 6

11 9 8 4

12 10 6 7

Assume alpha = 0.01. What is Fcrit? Report your answers to 2 decimal places.

What is the value of SS between? Report your answer to 2 decimal places.