I have such a hard time with Sum of squares, mean of squares, I keep messing up my steps, can you help me?

Seasonal affective disorder (SAD) is a type of depression during seasons with less daylight (e.g., winter is phototherapy, which is increased exposure to light used to improve mood. A researcher tests this ther patients with SAD to different intensities of light (low, medium, high) in a light box, either in the mornin times thought to be most effective for light therapy). All participants rated their mood following this the mood) to 9 (improved mood). The hypothetical results are given in the following table. Light Intensity Low Medium High Morning 5 5 7 5 6 8 4 4 6 7 7 9 5 9 5 Time of 6 8 8 Day Night 5 5 9 8 8 7 6 7 6 7 5 8 4 9 6 3 8 6 (a) Complete the F-table and make a decision to retain or reject the null hypothesis for each answers to two decimal places. Assume experimentwise alpha equal to 0.05.) Source of SS df MS F Variation Time of day Intensity Time of day x Intensity Error Total 10 0 State the decision for the main effect of the time of day