As part of a water quality survey, you test the water hardness in several randomly selected streams. The results are shown below. Construct a confidence interval for the population variance of and the population standard deviation e. Use a 90% level of confidence Assume that the population has a normal distribution 16 grains per galon What is the confidence interval for the population variance a [] Round to one decimal place as needed) Select the comect choice below an the Round to decimal places as needed) OA W 90% confidence, i OC we 90% confidence t e population varian What is the confidence interval for the population Round to one decimal place an ded) Interpret the results Select the conect choice below and t Round to one decimal places as needed) SOAL deviation? plete your choice OB W 10% confidence, it ca than OD with 10% confidence i

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