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 o and the population standard deviation o. Use a 95% level of confidence. Assume that the population has a normal distribution. n= 16 s = 13 grains per gallon What is the confidence interval for the population standard deviation o? UD (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal places as needed.) O A. With 5% confidence, you can say that the population standard deviation is between and O B. With 95% confidence, you can say that the population standard deviation is less than grains per gallon. grains per gallon. O C. With 95% confidence, you can say that the population standard deviation is between grains per gallon. and O D. With 5% confidence, you can say that the population standard deviation is greater than grains per gallon.

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Percentage

A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.

Algebraic Expressions

In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.

Numbers

Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.

Subtraction

Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.

Addition

Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.