Over last several years, the employ of cell phones has raised dramatically. According to the recent poll, the mean talking time for each month for cell phones was 372 minutes for men and 275 minutes for women, while the mean talking time for each month for traditional home phones was 334 minutes for men and 510 minutes for women.
Assume that the poll was based on the sample of 100 men and 100 women, and that the standard deviation of talking time for each month for cell phones was 120 minutes for men and 100 minutes for women, while the standard deviation of talking time per month for home phones was 110 minutes for men and 150 minutes for women. At the .05 level of significance, is there evidence of the difference in variability of monthly talking time on cell phones for men and women?