i'm all about that data
In this type of study treatments are randomly assigned to each group before collecting data.
What is a randomized experiment?
The first quartile minus the third quartile.
What is the interquartile range (IQR)?
TRUE or FALSE? If a fair coin is tossed many times and the last eight tosses are all heads, then the chance that the next toss will be heads is somewhat less than 50%.
FALSE.
Two letters from the English alphabet that are often used to represent variables in mathematics.
The proportion of YouTube videos that are cat videos out of a random sample of 1000 videos which you select.
What is the sample proportion?
A plot that is used to visualize two categorical variables each with two or more levels.
What is a side-by-side or stacked bar plot?
When knowing the outcome of one event provides no useful information about the outcome of the other event.
What is independent events?
A random process or variable with a numerical outcome.
What is a random variable?
All of the Americans that a random sample of 1155 Americans came from.
What is the population?
This plot provides a case-by-case view of the data for two numerical variables.
The proportion of times an outcome would occur if we observed its random process an infinite number of times.
What is a probability?
The weighted sum of each outcome of a random variable multiplied by its probability of occurence.
What is the expected value?
A fake treatment often given to the control group to keep them from knowing they did not receive any treatment.
What is a placebo?
The shape of a histogram with a "long tail" to the left.
What is left-skewed?
Drawing a face card and drawing an ace from a full deck of playing cards.
What are mutually exclusive events?
Two books are assigned for a statistics class. 20% of enrolled students do not buy either book, 55% buy the textbook only, and 25% buy both books. If there are 100 students enrolled, how many books will be purchased?
What is 105 books?
Discrete and continuous are to numeric data what ordinal and nominal are to this.
What is categorical data?
A third variable that is correlated with both the explanatory and response variables.
What is a confounding variable?
The probability of getting all tails if you flip a fair coin 10 times.
What is 0.0009765.
Values that are used to describe the typical deviation of a random variable around its expected value.
What are the variance and standard deviation?