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(3 points) The U.S. Department of Health and Human Services is interested in estimating the amount of fluoride levels in drinking water in Idaho. They take 31 samples of drinking water in locations across the state and find the average amount of fluoride per liter of water is x = 0.691 mg. Suppose the known population standard deviation of the amount of fluoride per liter of water is o = 0.035 mg. Use this information to answer the questions below. a. Compute a 92% confidence interval for , the average amount of fluoride per liter of water in Idaho. Enter your smaller bound as the 'lower bound' and your larger bound as the 'upper bound.' Round your answers to at least five decimals if necessary Lower bound: mg Upper bound: mg b. Interpret the interval that you calculated in part a. We are % confident that the average amount of fluoride levels v ? s ? the upper and lower bounds of the interval. drinking water in Idaho drinking water in this sample of locations in Idaho c. Suppose we were to increase the confidence level from 92% to 94% and compute a new confidence interval. If all other values/quantities stayed the same, how would the width of this new interval compare to the width of the interval computed in part a.? A. The new interval would be narrower B. The new interval would be the same width C. The new interval would be wider D. There is not enough information provided to determine how this would affect the interval width