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The Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 2/ kg with a sample standard deviation of 9 kg. Assume it follows a normal population. For a 90% confidence interval, what is the critical value needed? Part 1 of 3 Multiple Choice points X 01:53:05 O Z=196 Flies O t= 2947 O 1= 2131 O z =1645 CP