DSAT Data Analysis 2

Question 1

A scatterplot shows hours studied vs. test scores for 20 students. The line of best fit is y = 5.2x + 48. What does the slope 5.2 represent?

Accepted Answer

The predicted score increase for each additional hour studied

Answer

The slope represents the predicted change in y for each one-unit increase in x.

Question 2

A dataset has values: 12, 15, 15, 18, 20, 22, 95. Which measure of center best represents the typical value?

Accepted Answer

Median

Answer

The median is resistant to the outlier 95, making it the best measure of center for skewed data.

Question 3

A survey of 400 people found that 60% prefer brand A, with a margin of error of ±4%. Which interval most likely contains the true population proportion?

Accepted Answer

56% to 64%

Answer

Applying ±4% to 60% gives the confidence interval 56% to 64%.

Question 4

Which correlation coefficient best describes a strong negative linear relationship?

Accepted Answer

r = -0.88

Answer

A value of r = -0.88 indicates a strong negative linear relationship because it is close to -1.

Question 5

A box plot shows: minimum = 10, Q1 = 25, median = 40, Q3 = 55, maximum = 70. What is the interquartile range (IQR)?

Accepted Answer

30

Answer

IQR = Q3 − Q1 = 55 − 25 = 30.

(DSAT) Digital SAT Practice Test

(DSAT) Digital SAT Practice Test

DSAT Data Analysis 2