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### 143 results for "Deborah J. Rumsey"

• #### Statistics Tables for Reference

Several commonly used tables in statistics include the Z-table, the t-table, the binomial table, and a table of z*-values for selected confidence levels. Excerpted from

• #### Figuring Out What Probability Means

Probabilities come in many different disguises. Some of the terms people use for probability are chance, likelihood, odds, percentage, and proportion. But the basic definition of

Found in: Math
• #### Generalizing Statistical Results to the Entire Population

Making conclusions about a much broader population than your sample actually represents is one of the biggest no-no's in statistics. This kind of problem is called

Found in: Statistics
• #### Statistics Conundrums: Dealing with Survey Nonresponders

Nonresponders are always a problem when you're calculating the results of a survey. Before you can crunch the numbers in all the surveys you get back, you have to decide what to do about the surveys you

Found in: Statistics
• #### Using Probability When Hitting the Slot Machines

Remember the movie National Lampoon's Vegas Vacation, when gambling fever consumes Chevy Chase's character, Clark W. Griswold? He goes on a losing streak to beat all losing streaks while his son, Rusty

Found in: Math
• #### How to Determine Which Data Analysis to Use in Statistics II

Statistics II is often about data analysis, and the trick is to know when to use which analysis method. The following table helps you compare, contrast, and decide what data analysis to use and when. Use

Found in: Statistics
• #### Computer Output for Statistics II

If you’re taking Statistics II, you’re likely to face questions on computer output for multiple regression and ANOVA. Professors like to give output on exams and ask you to interpret it. Sometimes they

Found in: Statistics
• #### Tips for Statistics Test Success

Working on statistics problems (especially word problems) can be frustrating; but it doesn’t have to be! You just have to avoid the urge to jump right in and start doing calculations because the key to

Found in: Statistics
• #### Statistical Standard Scores and Standard Normal Distributions — The “Z-Table”

Statistics are handy when it comes to making predictions, but to make accurate predictions, you need to know how reliable your results are. The following Z- table shows standard scores and percentiles

Found in: Statistics
• #### Statistical T-Distribution — The “T-Table”

As a statistical tool, a t-table lists critical values for two-tailed tests. You then use these values to determine confidence values. The following t-table shows degrees of freedom for selected percentiles

Found in: Statistics
• #### Continuous Probability Distributions

When you work with continuous probability distributions, the functions can take many forms. These include continuous uniform, exponential, normal, standard normal

Found in: Probability
• #### Probability Study Tips

If you're going to take a probability exam, you can better your chances of acing the test by studying the following topics. They have a high probability of being on the exam.

Found in: Probability
• #### Principles of Probability

The mathematics field of probability has its own rules, definitions, and laws, which you can use to find the probability of outcomes, events, or combinations of outcomes and events. To determine probability

Found in: Probability
• #### Discrete Probability Distributions

In probability, a discrete distribution has either a finite or a countably infinite number of possible values. That means you can enumerate or make a listing of all possible values, such as 1, 2, 3, 4,

Found in: Probability
• #### Understanding Formulas for Common Statistics

After data has been collected, the first step in analyzing it is to crunch out some descriptive statistics to get a feeling for the data. For example:

Found in: Statistics
• #### Statistically Figuring Sample Size

When designing a study, the sample size is an important consideration because the larger the sample size, the more data you have, and the more precise your results will be

Found in: Statistics
• #### Surveying Statistical Confidence Intervals

In statistics, a confidence interval is an educated guess about some characteristic of the population. A confidence interval contains an initial estimate plus or minus a

Found in: Statistics
• #### Checking Out Statistical Confidence Interval Critical Values

Critical values (z*-values) are an important component of confidence intervals (the statistical technique for estimating population parameters). The z*

Found in: Statistics
• #### Handling Statistical Hypothesis Tests

You use hypothesis tests to challenge whether some claim about a population is true (for example, a claim that 40 percent of Americans own a cellphone). To test a statistical hypothesis, you take a sample

Found in: Statistics
• #### How to Calculate the Margin of Error for a Sample Mean

When a research question asks you to find a statistical sample mean (or average), you need to report a margin of error, or MOE, for the sample mean. The general formula for the margin of error for the

• #### How to Find Percentiles for a t-Distribution

When you want to find percentiles for a t-distribution, you can use the t-table. A percentile is a number on a statistical distribution whose less-than probability is the given percentage; for example,

• #### How to Find t*-Values for Confidence Intervals

Confidence intervals estimate population parameters, such as the population mean, by using a statistic (for example, the sample mean) plus or minus a margin of error. To compute the margin of error for

• #### How to Identify a Sampling Distribution

In statistics, a sampling distribution is based on sample averages rather than individual outcomes. This makes it different from a distribution. Here’s why: A

• #### How Sample Size Affects Standard Error

The size (n) of a statistical sample affects the standard error for that sample. Because n is in the denominator of the standard error formula, the standard error decreases as

• #### How Population Standard Deviation Affects Standard Error

In statistics, the standard deviation in a population affects the standard error for that population. Standard deviation measures the amount of variation in a population. In the standard error formula

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