Digital SAT Practice Questions

In a dataset with values {3, 5, 8, 12, 17, 21}, what is the interquartile range (IQR)?...

If the mean of five numbers is 18, and four of the numbers are 12, 15, 20, and 22, what is the fifth number?...

A frequency distribution shows 4 students scored 70, 6 scored 80, and 10 scored 90. What is the weighted average score?...

The range of a set of 8 positive numbers is 24. If the lowest number is 6, what is the highest number?...

Which measure of central tendency is always equal to one of the original data values in any list?...

A class of 24 students took a test; 12 scored 80 and 12 scored 100. What is the standard deviation?...

If a set of numbers has a standard deviation of 0, what can be concluded about the numbers?...

The median of 11 consecutive odd integers is 25. What is the largest integer in the set?...

Adding the value 15 to a dataset increases the mean from 10 to 11. How many values were in the original dataset?...

A sample has values {2, 4, 4, 4, 6, 8, 14}. What is the mode of this dataset?...

Two distributions have the same mean, but Distribution A has a wider spread than Distribution B. Which distribution has the greater standard deviation?...

A scatterplot's line of best fit is $\hat{y} = 2.4x + 15$. For $x = 10$, the observed value is $y = 42$. What is the residual?...

In a linear model $y = -1.8x + 45$, what is the predicted change in $y$ for every 1-unit increase in $x$?...

A survey of 1,200 voters found that 54% favored Proposition A with a margin of error of 3%. What is the plausible interval for the true population proportion?...

How does increasing the sample size of a random poll affect the margin of error?...

A researcher wants to establish a cause-and-effect relationship between study habits and exam scores. Which method is required?...

A study on commuting times sampled 500 residents selected randomly from City X. To which population can the findings be generalized?...

A poll surveyed customers at a high-end luxury auto dealership about national economic confidence. Why might this sample be biased?...

On a scatterplot, if all data points lie exactly along the line $y = -3x + 8$, what is the correlation coefficient $r$?...

A scatter plot shows a correlation coefficient of $r = 0.85$. How is this relationship best characterized?...

In a linear regression model $\text{Salary} = 1,500(\text{Years}) + 38,000$, what does the value 38,000 mean?...

A scatterplot compares study time (hours) to test score. The line of best fit is $y = 6.5x + 45$. What score is predicted for 8 hours of study?...

If the residual for a data point $(5, 68)$ relative to line $\hat{y} = 10x + 12$ is evaluated, what is its value?...

Which of the following correlation coefficients indicates the weakest linear association?...