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. 8.56 to 11.44 O b. 8.59 to 11.40 Oc. 8.60 to 11.39 O d. 8.60 to 11.40

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