West B Test West B Math: Data Analysis and Statistics 3

Question 1

A scatter plot shows points that generally move from the lower left to the upper right. This pattern is called:

Accepted Answer

A positive correlation

Answer

When both variables increase together (lower-left to upper-right trend), the scatter plot shows a positive correlation.

Question 2

A school surveys 100 students and finds 60 prefer online learning and 40 prefer in-person learning. What fraction prefers in-person learning?

Accepted Answer

2/5

Answer

40 out of 100 students prefer in-person learning, which simplifies to 40/100 = 2/5.

Question 3

When data is said to be 'skewed right,' it means:

Accepted Answer

Most values are clustered on the left with a tail extending right.

Answer

A right-skewed distribution has most data clustered at lower values with a long tail stretching toward higher values on the right.

Question 4

What is the probability of rolling a 3 on a standard six-sided die?

Accepted Answer

1/6

Answer

There is one face showing 3 out of six total faces, giving a probability of 1/6.

Question 5

A student's test scores are 88, 92, 76, 95, and 84. What score would need to be added so that the mean equals exactly 87?

Accepted Answer

83

Answer

Current sum = 435; target sum for 6 scores at mean 87 = 522; missing score = 522 − 435 = 87 — wait, re-check: 88+92+76+95+84=435; 87×6=522; 522−435=87. The answer is 87.

West B Test Practice Test

West B Test Practice Test

West B Test West B Math: Data Analysis and Statistics 3