The null hypothesis is that there is no difference between the mean number of swallows taken to finish a drink among patrons experiencing the high-volume noise level of 88 dB and the mean number of swallows taken to finish a drink among those experiencing the normal rouse level of 72 dB. The alternative hypothesis is that there is a difference between the mean number of swallows taken to finish a drink among patrons experiencing the louder noise level of 88 dB and the mean number of swallow taken to finish a drink among those experiencing the normal noise level of 72 dB. Below are the graphs of two possible data sets. The horizontal axes display the number of swallows taken to finish a drink, while the vertical axes display the number of observed patrons who took that number of swallows to finish a drink. Use these graphs to answer the questions that follow. Which data set appears to have move variability between treatments that within treatments? Data set A Data set B The data that you collect suggest that the between-treatments variance is large, relative to the within treatment variance, so the F ratio for out study is likely to be suggesting that .