Main > Normal Distributions > Calculate a z-score Calculate a z-score Part II of a two part video on z-scores and how to calculate them: Calculate a z-score Pt 1 For the first video in this series, see: Part I:…

# Find a Critical Value in Any Tail: Easy Steps

Main > Critical Values & Hypothesis Testing > Find a critical value Critical values are used in hypothesis testing. The alpha level is the maximum probability where you reject the null hypothesis if the null hypothesis is true. The technique…

# How to Figure out a Normally Distributed Probability Question Using the TI-89

Topic Index > TI 89 The standard normal distribution, sometimes called a “bell curve,” allows you to take normally distributed data (data that looks like the bell curve), and draw conclusions. It saves a lot of work, and a lot…

# Z Score TI 89 (Left-Tailed test): Easy Steps

Topic Index > TI 89 > Z Score TI 89 Finding a critical value and reading a z-table are an essential part of elementary statistics. Critical values are used for hypothesis tests, and can help you use the standard normal…

# Support or Reject Null Hypothesis in Easy Steps

Main > Critical Values & Hypothesis Testing When to reject the null hypothesis Basically, you reject the null hypothesis when your test value falls into the rejection region. There are four main ways you’ll compute test values and either support…

# Word problems with normal distribution: “Between”

Main > Normal Distributions > Word problems with normal distribution: “Between” Word problems with normal distribution: “Between” This how-to covers solving normal distribution problems that contain the phrase “between” and includes an upper and lower limit (i.e. “find the number…

# Statistics normal distribution word problems: “Above”

Main > Normal Distributions > Statistics normal distribution word problems: “Above” Statistics normal distribution word problems Word problems in stats can be broken down into several types. You might be asked to find an area (or a probability) for “less…

# Normal distribution word problems less than

Main > Normal Distributions Index > normal distribution word problems less than Normal distribution word problems less than Normal distribution word problems are extremely common in stats classes. Like the dreaded word problems in algebra, they can seem a little…

# Standard normal distribution: How to Find Probability

Main > Normal Distributions > Standard normal distribution: How to Find Probability “Find the probability P ( z < .70 )” or some other inequality like P ( z > -0.46 ) or P ( -.9 < z < .4…

# Two Tailed Normal Curve: How to find the area

Main > Normal Distributions > Two Tailed Normal Curve Two Tailed Normal Curve: How to find the area A two tailed normal curve is one where there’s an area in each of the two tails. In order to find the…