CodeHS Data-Driven Decision Making 2

Question 1

A school wants to reduce its dropout rate. Which data source would BEST help identify at-risk students early?

Accepted Answer

Student attendance records and grade trends

Answer

Attendance records and grade trends are leading indicators that correlate strongly with dropout risk.

Question 2

When visualizing the relationship between two continuous numeric variables, which chart type is most appropriate?

Accepted Answer

Scatter plot

Answer

A scatter plot displays individual data points for two numeric variables, making it ideal for spotting correlations.

Question 3

A retailer notices sales spike every December. This pattern is best described as:

Accepted Answer

Seasonal variation

Answer

Seasonal variation refers to regular, repeating fluctuations tied to a specific time of year.

Question 4

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

Accepted Answer

Median

Answer

The median is the middle value and is resistant to the pull of very high or very low outliers.

Question 5

A company's data shows that ice cream sales and drowning incidents both increase in summer. This is an example of:

Accepted Answer

Spurious correlation

Answer

Both variables are driven by a third factor (hot weather), making their correlation spurious rather than causal.

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