STAT Data Interpretation from Graphs 3

Question 1

A time-series graph shows a company's quarterly profits over 3 years. The trend line slopes upward but individual quarters alternate high and low. What best describes this pattern?

Accepted Answer

An overall upward trend with seasonal fluctuation

Answer

An upward-sloping trend line combined with alternating quarterly values indicates overall growth with seasonal fluctuation.

Question 2

A bar chart shows the number of books read per month by five students: Ana=8, Ben=5, Cara=12, Dan=3, Eve=7. What is the mean number of books read?

Accepted Answer

7

Answer

(8+5+12+3+7) / 5 = 35/5 = 7.

Question 3

A line graph shows two companies' stock prices. Company X starts at $50 and ends at $80; Company Y starts at $20 and ends at $38. Which company had a higher percentage growth?

Accepted Answer

Company Y

Answer

Company X grew 60% ($30/$50), while Company Y grew 90% ($18/$20), so Company Y had higher percentage growth.

Question 4

A frequency polygon has peaks at values 30, 50, and 70, with the highest peak at 50. What does this shape suggest about the distribution?

Accepted Answer

The data is roughly symmetrical with a central peak

Answer

A central dominant peak at 50 with roughly symmetric side peaks at 30 and 70 suggests an approximately symmetrical, bell-shaped distribution.

Question 5

A grouped bar chart compares commute times (under 30 min, 30–60 min, over 60 min) for City A and City B. City A's tallest bar is 'under 30 min' while City B's tallest bar is '30–60 min.' What can be concluded?

Accepted Answer

City A residents more commonly have short commutes than City B residents

Answer

The tallest bar indicates the most frequent category; City A's modal commute is under 30 minutes while City B's is 30–60 minutes.

STAT - Special Tertiary Admissions Test Practice Test

STAT - Special Tertiary Admissions Test Practice Test

STAT Data Interpretation from Graphs 3