Gender Discrepancy of Comedy Movies

Introduction
I am conducting research on the gender discrepancies of the ten movie genres: action, animation, comedy, drama, family, horror, musical, mystery, romance, and sci-fi.

Source
My source is the IMDB movie rankings as they pertain to my top 10 movies of each genre. The movie rankings are weighted averages of individual rankings on a scale of 1 to 10 for each movie. Average rankings are broken down into men, women, and the following four age groups: under 18, 18-29, 30-44, and 45 and up.

Men vs. Women
The following two tables show the weighted average rankings for men and women respectively for each age range for each of the top 10 comedy movies, as well as the averages of these numbers for all 10 films and for all age ranges.

Weighted Average Rankings for Men
movie	<18	18-29	30-44	45+	total
Back to the Future	8.6	8.3	8.0	7.8	8.2
The Graduate	8.3	8.2	8.0	8.1	8.1
Hair	7.0	6.9	6.7	6.6	6.8
Grease	6.8	6.4	6.8	6.5	6.6
Around the World in Eighty Days	8.0	6.6	6.7	6.9	6.8
When Harry Met Sally	7.5	7.5	7.6	7.6	7.6
Breakfast at Tiffany's	8.1	7.7	7.6	7.7	7.7
Willy Wonka and the Chocolate Factory	8.0	7.7	7.7	7.2	7.7
Guys and Dolls	7.5	7.0	7.0	7.3	7.1
Annie Hall	8.2	8.3	8.2	7.8	8.2
total	7.80	7.46	7.43	7.35	7.48

Weighted Average Rankings for Women
movie	<18	18-29	30-44	45+	total
Back to the Future	7.8	8.1	7.7	8.0	8.0
The Graduate	5.5	8.1	7.7	8.1	7.9
Hair	5.0	7.4	7.0	7.1	7.1
Grease	7.8	7.7	7.7	7.4	7.7
Around the World in Eighty Days	6.8	6.2	6.4	7.2	6.6
When Harry Met Sally	6.4	7.9	7.9	7.7	7.8
Breakfast at Tiffany's	9.1	8.2	8.0	8.1	8.1
Willy Wonka and the Chocolate Factory	8.4	8.1	8.1	7.4	8.0
Guys and Dolls	8.0	7.5	7.4	7.7	7.6
Annie Hall	5.3	7.9	7.2	7.4	7.5
total	7.01	7.71	7.51	7.61	7.63

Conclusion
Overall, women tend to prefer comedy movies by a narrow margin. However, teenage boys greatly prefer comedies.

Teens (under 18): 7.80 vs. 7.01 (+0.79)
Young Adults (18-29): 7.46 vs. 7.71 (-0.25)
Middle-Aged (30-44): 7.43 vs. 7.51 (-0.08)
Older Adults (45+): 7.35 vs. 7.61 (-0.26)

Potential Sources of Error
There are several potential sources of error in this survey. Since the movie rankings on IMDB are voluntary, they do not necessarily (and most likely do not in fact) reflect the true opinions of moviegoers. Also, not all moviegoers visit IMDB, which further biases the results. Furthermore, the top 10 comedies on the list above may not be representative of all comedy movies.