You have developed a nutrient cocktail which you believe reduces leaf yellowing under bright light for the houseplant Epp'r'emnum aureum. You give this cocktail to a random sample of 30 E. aareum plants, and leave them with 30 control E. aareum in identical conditions in the greenhouse. After a week, you record the percentage of E. am'eum plants in each group with yellowed leaves, and want to test whether your cocktail was effective. You need a test of: (a) Unpaired means (b) One sample proportion (c) Paired means (d) One sample mean (e) Two sample proportion Which of the following is used to control type-I error in a hypothesis testing problem? (a) Significance level (b) Power (0) Effect size (d) None of the above You want to compare average total rainfall in Ithaca during September-November to the average total rainfall during January-March by tracking the overall rainfall totals during the two periods over the course of 20 years. Which of the following scenarios is the most relevant? (a) one population mean (,u) (b) mean difference of two unrelated (independent) populations (Jul #2) (c) mean difference of two related (paired) populations (Md) (d) none of the above We perform a onesample test of proportion with H0 : p : 0.5 vs. H A : p > 0.5, which gave us a p-value of 0.028. If instead, we had used H A : p a 0.5, then we would have found a pvalue of: (a) 0.014 (b) 0.028 (c) 0.056 (d) Not enough information for a conclusive