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D Question 12 3 pts Is the amount of sleep that Americans get more than 8 hours per day? In 2013, the Bureau of Labor Statistics, conducted a survey. They asked the participants to make a diary of what they did during a 24 hour period. The sample size was 150. The sample mean amount of sleep was 8.74 hours and the sample standard deviation was 2.4. What is the test statistic? O -3.78 O 0.31 O -0.31 O 3.78 D Question 13 3 pts In the US, the allowable amount of mercury in drinking water is 2 parts per 1000 Liters. Water from 5 randomly selected homes was taken. The amount of mercury in the water is below. A scientist wants to test to see if the amount of mercury is unsafe. These measurements are also in parts per 1000 Liters. 1 0 0.5 Find the standard error that would be used in the test statistic to test this claim. O 0.5 O 0.199 O 0.1 O 0.2236