Shape, Center, & Spread
This measure is the difference between the maximum and minimum value of a data set
What is the range?
The percentile of a z-score = 1.
What is 84.13%?
The "count" of a categorical variable is also referred to as.
What is the frequency?
A linear regression predicts ice cream sales from daily temperature in Fahrenheit. This is the explanatory variable.
What is temperature in Fahrenheit?
This is the formula for finding a residual.
What is actual - predicted?
The shape of the distribution of scores of a difficult math test: 39, 40, 41, 42, 43, 44, 45, 47, 50, 51, 52, 85, 94, 97, 99, 100
What is right skewed?
The percentile of a z-score = -.33.
What is 37.07%?
This graph gives us a visual percentage breakdown of univariate categorial data.
What is a pie chart?
Abigail gathered data on different schools' average yearly salary of their head coaches (in millions of dollars) and the school's winning percentages in the years 2000-2011. The slope of the regression line of the data is 8.42. This is the interpretation of the slope.
What is: for every 1 million dollar increase in salary, there is an 8.42 point increase in winning percentage?
If the linear model is a good fit for the data, we can expect the points to be this way about the x axis.
What is randomized/scattered/no clear pattern?
A distribution is skewed left. This measure of spread is unaffected by the skew.
What is the interquartile range?
A box plot tells us these percentiles of a distribution.
What are the 25th, 50th, and 75th percentiles?
This type of frequency relates a joint frequency and a corresponding marginal frequency.
What is a conditional relative frequency?
A linear regression predicting grade point average from number of extracurriculars yields an r value of .8. This is the correct interpretation of the r value.
What is a strong positive correlation between number of extracurriculars and grade point average?
A cumulative frequency plot's y-axis tells us this information.
What are percentiles?
A distribution is normal. These measures of center and spread should be used to describe the data.
What is the mean and standard deviation?
Heights of women are distributed normally with a mean of 63.5 inches and a standard deviation of 1.27 inches. This height is at the 6th percentile.
What is 61.52 inches?
In the notation N~(x, y), x and y are the _________ and _______, respectively.
What are the mean and standard deviation?
A linear regression predicting SAT scores from homework average yields an r2 value of .38. This is the correct interpretation of the correlation between homework average and SAT scores.
A linear regression on smoking and lung cancer yields a correlation coefficient of .8. It is (true/false) that we can conclude smoking causes lung cancer.
What is false?
The 5-number summary, mean, and standard deviation, of the following distribution scaled up by 5%: 2.05, 3.6, 5.12, 8.17, 9.27, 13.12.
What is a min of 2.15, Q1 of 3.78, Q2 of 6.98, Q3 of 9.73, and max of 12.78, a mean of 7.23, and standard deviation of 3.92?
The times for a a 100m dash are normally distributed with a mean of 14.5 seconds and a standard deviation of 3.8 seconds. The slowest 12% of runners had this time or higher.
What is 18.98 seconds?
This is the correct method for finding the median value given a histogram with an even number of data points.
What is calculating the total number of data points, then looking for the histogram bar which contains the total number of data points/2 and the total number of data points/2 + 1?
A data set has the following x values: x = {2, 5, 8, 12, 15, 21}. This is the set of x values transformed by a logarithm (base 10).
What is x = {.301, .699, .903, 1.08, 1.18, 1.32}?
Outliers in this direction tend to be influential.
What is the x direction?