Descriptive Stats
This measure of center tells us what value occurs with the greatest frequency in a data set.
What is the mode?
The art and science of collecting, analyzing, presenting, and interpreting data.
What is statistics?
Data that consists of attributes, labels, or non numeric entries.
What is qualitative data?
My distribution is symmetric and bell shaped.
What is the normal distribution?
Inferential statistical analysis infers properties of a _____________.
What is population?
This measure of center is resistant to outliers and identifies the middle value in a set of data.
What is the median?
The entire group to be studied.
What is the population?
The four levels of measurement.
What are Nominal, Ordinal, Interval and Ratio?
If there is no skewness or the distribution is symmetric, then these three measures of center are equal.
What is mean = median = mode?
When you accidentally reject Ho when Ho is correct.
What is Type I Error?
This measure of center is not resistant to outliers and indicates the average value for a set of data.
What is the mean?
I represent the number of standard deviations a value is from the mean.
What is a z-score?
The variable about which a researcher is asking a question
For data that is not symmetrical and or has a small sample size, it is better to use the ______ and ______ to describe the distribution.
What is median and IQR?
In this type of inference, we estimate an unknown parameter using a single number that is calculated from the sample data.
What is a point estimation?
This measure of variation tells us how much data values deviate from the average/mean.
What is the standard deviation?
Identify the population and the sample: A survey of 1906 household in the United States found that 13% have a high definition of television.
Population: All U.S. households
Sample: 1906 U.S. households surveyed.
A variable that is not included as an explanatory or response variable in the analysis but can affect the interpretation of relationships between variables.
What is a lurking variable?
If a distribution is said to be left-skewed, usually (but not always) the mean is _______ than the median.
What is lower?
We do not know the variation in the population so we use the variation in the sample as an estimate of it. This is expressed in the _____________.
What is standard deviation?
This measure of position indicates the value below which a given percent of observations falls. (Values in ascending order)
What is percentile?
Parameter or Statistic: As of January 2007, 44% of the governors of the 50 states in the United States are Republicans.
What is Parameter?
A quantity having a numerical value for each member of a group
What is a random variable?
For positively skewed data, the right tail is _______ and the mass of the distribution is concentrated on the __________ of the figure.
What is longer and left?
If a person found a 95% confidence interval to be (5, 100) and they say "95% of the data falls between the numbers (5, 100)" would they be correct? If not, what would be the correct way to say it?
"We are 95% confident that the true population mean is captured by the interval (5, 100)" or "95% of all trials using this technique would give intervals that capture the true population mean".