QR . Alcoholic fermentation in wines. Determining alcoholic fermentation in wine is critical to the wine-making process. Must/wine density is a good indicator of the fermentation point since the density value decreases as sugars are converted into alcohol. For decades, winemakers have measured must/wine density with a hydrometer. Although accurate, the hydrometer employs a manual process that is very time-consuming. Consequently. large wineries are searching for more rapid measures of density measurement. An alternative method utilizes the hydrostatic balance instrument (similar to the hydrometer, but digital). A winery in Portugal collected the must/wine density measurements for white wine samples randomly selected from the fermentation process for a recent harvest. For each sample. the density of the wine at 20C was measured with both the hydrometer and the hydrostatic balance. The densities for 40 wine samples are saved in the WINE40 & file. (The head of the data is given below.) The winery will use the alternative method of measuring wine density only if it can be demonstrated that the mean difference between the density measurements of the two methods does not exceed 002, You must include the 95% ci for the appropriate parameter and interpret the interval in light of the cbject of the analysis. SAMPLE HMETER HSTATIC 1 1.89 189 2 1.0 1.8 1181 L@l 4 189 138 5 148 111 & 1.9 189