West B Math: Data Analysis and Statistics Flashcards

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

Answer: A positive correlation

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

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

Answer: 2/5

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

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

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

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

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

Answer: 1/6

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

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?

Answer: 83

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.

Which measure of central tendency is LEAST affected by extreme outliers in a data set?

Answer: Median

The median, as the middle value, is resistant to extreme outliers because it depends only on position, not the actual size of values.