B. t-test 1. To evaluate the accuracy of a new analytical method, an analyst determines the purity of a standard for which u is 100.0%, obtaining the following results. 99.28% 103.93% 99.43% 99.84% 97.60% 96.70% 98.02% Is there any evidence at c=0.05 that there is a determinate error affecting the results? 2. To compare two production lots of aspirin tablets, you collect samples from each and analyze them, obtaining the following results (in mg aspirin/tablet). Lot 1:256 248 245 245 244 248 261 Lot 2:241 258 241 244 256 254 3. Suppose you are studying the distribution of zinc in a lake and want to know if there is a significant difference between the concentration of Zn2+ at the sediment-water interface and its concentration at the air-water interface. You collect samples from six locationsnnear the lake's center, near its drainage outlet, etcobtaining the results {in mgfL) shown in the table. Using this data, determine if there is a significant difference between the concentration of Zn\" at the two interfaces at . Complete this analysis treating the data as paired. Air-Water Sediment- lnterface Water Interface Location C. ANOVA 1. Table below shows the results obtained in an investigation into the stability of a fluorescent reagent stored under different conditions. The values given are fluorescence signals (in arbitrary units] from dilute solutions of equal concentration. Three replicate measurements were made on each sample. Conditions Freshly prepared Stored for 1 hr in the dark Stored for 1 hr in subdued light Stored for1 hr in bright light Is there any significant difference in the conditions applied to the stability of the reagent? ( A. In replicate analyses, the carbohydrate Content of a glycoprotein ( a protein with sugars attached to it) is found to be 12.6. 11.9, 13.0, 12.7, and 12.5 g of carbohydrate per 100 g of protein. (a) Find the mean of the measurements. (b) Find the standard deviation (s). (c) Find the 90% confidence intervals for the carbohydrate content. ((1) If the and s are unchanged, but there are 10 measurements (N=10i instead of 5. what would be the confidence interval? (9) How does increasing the number of replicate measurements affect the reliability of measurements? Explain your answer. (Hint: better precision gives smelter confidence in tervais) (f) Based on the data given, which of these can be considered an outlier? Prove it (Use Grubb's Test}