Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 175 people. The sample mean is 23.1 ho There is a known population standard deviation of 6.2 hours. The population distribution is assumed to be normal. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) O Part (a) Find the following. (Enter exact numbers as integers, fractions, or decimals.) (i) (ii) (ii) n = O Part (b) O Part (c) Which distribution should you use for this problem? (Round your answers to two decimal places.) X- ? v Explain your choice. O The Student's t-distribution should be used because the sample standard deviation is given. O The standard normal distribution should be used because the mean is given. O The Student's t-distribution should be used because the sample mean is smaller than 30. O The standard normal distribution should be used because the population standard deviation is known. Correct! To be able to use the standard normal distribution, the standard deviation of the population must be know. O Part (d)

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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.