Descriptive Statistics
This statistic represents the average value of a dataset.
What is the mean?
The probability of an impossible event.
What is 0?
The hypothesis that represents no effect or no difference.
What is the null hypothesis?
A confidence interval provides a range of plausible values for a ______.
What is a population parameter?
The bell-shaped distribution commonly used in statistics.
What is the normal distribution?
The middle value when data are arranged from least to greatest.
What is the median?
The probability of a certain event.
What is 1?
The symbol commonly used for the null hypothesis.
What is H₀?
The most commonly used confidence level.
What is 95%?
In a normal distribution, the mean, median, and mode are all ______.
What is equal?
This measure tells us how spread out data are from the mean.
What is the standard deviation?
If a fair coin is flipped once, what is the probability of getting heads?
What is 0.5 (or 50%)?
A p-value less than α usually means we do what to H₀?
What is reject the null hypothesis?
As sample size increases, confidence intervals generally become wider or narrower?
What is narrower?
Approximately what percent of data falls within 1 standard deviation of the mean?
What is 68%?
The difference between the largest and smallest values in a dataset.
What is the range?
Two events are independent if the occurrence of one does not affect the ______ of the other.
What is probability?
The most common significance level used in statistics.
What is 0.05?
A confidence interval consists of a statistic plus or minus a ______.
What is margin of error?
Approximately what percent falls within 2 standard deviations?
What is 95%?
A graph used to display quantitative data using adjacent bars.
What is a histogram?
Formula used to calculate probability.
What is
P(Event) = Favorable Outcomes / Total Outcomes?
This error occurs when a true null hypothesis is rejected.
What is a Type I Error?
Increasing the confidence level generally makes the interval wider or narrower?
What is wider?
The rule describing 68%, 95%, and 99.7%.
What is the Empirical Rule?