As part of the water survey you test the water hardness in several randomly selected streams. The results are shown below. construct a confidence interval for the population variance the population standard deviation. use a 90% level of confidence. assume the population has a normal distribution. n=19 s=18 grains per gallon What is the confidence interval for the population variance o?? OD (Round to one decimal place as needed.) Interpret the results. Select the corect choice below and f in the answer boxtes) to complete your choice (Round to one decimal places as needed.) OA Wth 10% confdence, it can be said that the population variance is greater than Oc With 10% confidence, it can be said that the population variance is beteeenand OB we sos con 00 wn s0% confidence Interpret the results. Select the correct choice below and fil in the answer box(es) to complete your choice (Round to one decimal places as needed.) O A. With 90% confidence, you can say that the population standard deviation is between gallon. andraine per ON O C. With 10% confidence, you can say that the population standard deviation is greater than grains per galon R

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