SC READY Data Analysis, Statistics & Probability 3

Question 1

A scatter plot comparing hours of study and test scores shows points trending upward from left to right. What type of correlation does this represent?

Accepted Answer

Positive correlation

Answer

When both variables increase together (more study hours → higher scores), the relationship is a positive correlation.

Question 2

A researcher polls 30 randomly selected students from a school of 600 about their lunch preference. This is an example of which sampling method?

Accepted Answer

Random sample

Answer

Randomly selecting students from the larger population is a random sample, which helps ensure results represent the whole school.

Question 3

A data set has the values 4, 6, 8, 10, 100. Which measure of center BEST represents the typical value in this data set?

Accepted Answer

Median

Answer

The outlier 100 skews the mean significantly, so the median (8) better represents the typical value in this data set.

Question 4

A student rolls a number cube (1–6) 60 times and gets a 3 exactly 12 times. The theoretical probability of rolling a 3 is 1/6. Which statement is BEST supported by these results?

Accepted Answer

The experimental probability (12/60 = 1/5) differs slightly from the theoretical (1/6), which is normal

Answer

Experimental probability rarely matches theoretical probability exactly; small differences are expected and normal with limited trials.

Question 5

A school graph shows enrollment increased from 400 in 2018 to 500 in 2023. If the trend continues at the same rate, what would the predicted enrollment be in 2028?

Accepted Answer

600

Answer

Enrollment increased by 100 over 5 years; continuing at the same rate adds another 100 over the next 5 years: 500 + 100 = 600.

SC READY - South Carolina College and Career Ready Assessments Practice Test

SC READY - South Carolina College and Career Ready Assessments Practice Test

SC READY Data Analysis, Statistics & Probability 3