What is the t critical value when n = 17 and C = 95%? 2.145 b. 2.120 O c. 2.110 Od. 2.131 What is the z critical value when C = 95%? Oa. 2.575 Ob. 1.96 O c. 1.645 O d. 1.65 What is the 95% confidence interval for the mean number of hours spent by senior high school students using Google services per day? A sample of 20 produced a mean of 10 hours and a standard deviation of 3 hours. O a. 8.60 to 11.40 O b. 8.56 to 11.44 O c. 8.59 to 11.40 Od. 8.60 to 11.39

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