Can you calculate the difference of effect size using the F formula in eta squared Question 2a b:

Can you calculate the difference of effect size using the F formula in eta squared

Question 2a & b:

2. Sigall and Ostrove (1975) did an experiment to access whether the physical attractiveness of a defendant on trial for a crime had an effect on the severity of the sentence given in mock jury trials. Each of the participants in this study was randomly assigned to one of the following three treatment groups; every participant received a packet that described a burglary and gave background information about the accused person. The three treatment groups differed in the type of information they were given about the accused person's appearance. Members of group 1 were shown a photograph of an attractive person; members of group 2 were shown a photograph of an unattractive person; members of group 3 saw no photograph. Some of their results are described here. Each participant was asked was to assign a sentence (in years) to the accused person; the researchers predicted that more attractive persons would receive shorter sentences.

a. Prior to assessment of the outcome, the researchers did a manipulation check, Members of Groups 1 and 2 rated the attractiveness (on a 1 to 9 scale, with 9 being the most attractive) of the person in the photo. They reported that for the attractive photo, M = 7.53; for the unattractive photo, M = 3.20, F (1, 108) = 184.29. Was this difference statistically significant (using  = .05)?

b. What was the effect size for the difference in (2a)?