1. To access the accuracy of a standard weight scale in a laboratory, a known weight is 20 grams and is repeatedly weighed. The scale readings are normally distributed with a standard deviation of o = 0.01 grams. Suppose a scientist weighs the standard weight four times and obtains a mean weight of x-bar is 20.01 grams. Construct a 99% confidence interval for the mean of repeated measurements of the weight. (20.004, 20.016) (20.000, 20.020) (19.997, 20.023) O (19.994, 20.006) O (19.987, 20.013)