Descriptive and Inferential Statistics
This is a measure of central tendency, often referred to as the average of a dataset.
What is the mean?
In hypothesis testing, this value represents the probability of rejecting the null hypothesis when it is true.
What is the alpha level?
This test is used to compare the means of two independent groups.
What is a t-test for independent samples?
If Pearson’s r equals 0, there is none of this between two variables.
What is a linear relationship?
A dataset with a tail stretching to the left is described as this.
What is negatively skewed?
The mean of a distribution of z-scores is always this value.
What is 0?
If a researcher finds a significant result, they will do this to the null hypothesis.
What is reject the null hypothesis?
The test used by a researcher who wants to determine whether caffeine impacts concentration levels by comparing (the same) participants' after consuming no caffeine, a cup of coffee, and a can of Red Bull.
What is a repeated measures one-way ANOVA?
This term describes the strength and direction of a linear relationship between two variables.
What is correlation?
A distribution with a high peak and thin tails is known as this.
What is leptokurtic?
This type of statistic is used when a researcher uses data from a sample to make conclusions about a population.
What is inferential statistics?
In ANOVA, these tests are conducted after a significant F value is found to determine specific group differences.
What are post-hoc tests?
The test used when a researcher wants to compare one sample to a known population Mu and the Sigma.
What is a single-sample z-test?
This statistical method predicts the value of one variable based on the value of another.
What is regression?
This measure of variability represents the average squared deviation from the mean.
What is variance?
This term describes the difference between a sample statistic and the corresponding population parameter.
What is sampling error?
The probability of failing to reject the null hypothesis when it is false is referred to as this.
What is beta?
This is used when there is more than one independent variable.
A factorial design.
A scatterplot with points forming a perfect upward-sloping line indicates this kind of correlation.
What is a perfect positive correlation?
This distribution has a mean of 0 and a standard deviation of 1.
What is a standard normal distribution?
The larger the sample size, the closer the sample mean is likely to be to the population mean, according to this principle.
What is the law of large numbers?
A researcher’s choice to predict a specific direction of the effect.
What is a one-tailed test?
The factorial notation for a research study with three independent variables each with three levels.
What is a 3x3x3?
If a variable increases while another decreases, the two have this type of relationship.
What is a negative correlation?
This term describes how much scores in a dataset differ from one another.
What is standard deviation?