A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 127 students who averaged 35.5 texts per day. The standard deviation was 20.3 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a t v distribution. b. With 98% confidence the population mean number of texts per day is between and texts. c. If many groups of 127 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day.

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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.