Descriptive Statistics
The average of a data set
What is the mean?
The chance of flipping heads on a fair coin.
What is 1 out of 2, or 0.5?
This type of graph uses bars to display the frequency of data in intervals
What is a histogram?
This hypothesis says "nothing is happening" or "there is no difference"
What is the null hypothesis?
Using the TI-84, this chart type is best for seeing the shape of a distribution
What is a histogram?
A value that appears most frequently in a data set.
What is the mode?
In this kind of sample, everyone has an equal chance of being selected.
What is a random sample?
This bell-shaped curve is symmetrical and centered around the mean.
What is a normal distribution
This value tells us how likely our sample result is, assuming the null hypothesis is true.
On the TI-84, 1-Vars Stat gives you these two key values.
What are the mean and standard deviation?
This measure of spread is the difference between the largest and the smallest value
What is the range?
These two events cannot happen at the same time
What are mutually exclusive events?
A distribution with a long tail to the right
What is a right-skewed distribution?
This type of error happens when we reject a true null hypothesis.
What is a Type 1 error?
A scatterplot with a downward trend shows you this type of relationship
What is a negative correlation?
A boxplot helps you visualize this five-number summary.
What is the minimum, Q1, median, Q3, and maximum?
This rule allows us to find the probability of either of two events occuring
What is the addition rule?
About 95% of data falls within this many standard deviations of the mean in a normal distribution.
What is 2 standard deviations
If your p-value is less than alpha=0.05, you should do this with the null hypothesis.
What is reject it?
On the TI-84, if you see a 95% confidence interval of (50,70), this is how confident you are that the true population value falls within that range.
What is 95% confident?
This statistic tells you how far, on average, the values are from the mean
What is the standard deviation?
The idea that as the number of trials increases, the relative frequency gets closer to the true probability.
What is the Law of Large Numbers?
The area under the entire normal curve represents this.
What is 1 or 100%?
The critical value for a 95% confidence level using a standard normal distribution?
What is 1.96?
What is 1-PropZTest