Ohio Civil Service Exam Data Interpretation and Analysis 5

Question 1

A civil service analyst reviews a table showing that Region X has a crime rate of 42 per 1,000 residents and Region Y has 31 per 1,000. Region X has 25,000 residents and Region Y has 40,000. Which region has more total crimes?

Accepted Answer

Region X with 1,050

Answer

Region X: 42 × 25 = 1,050 crimes; Region Y: 31 × 40 = 1,240 crimes — Region Y has more, so the answer listing Region X at 1,050 is the accurate figure for Region X, but Region Y has more total crimes.

Question 2

A dataset shows 6 employees' sick days: 2, 5, 3, 8, 4, 2. What is the range of sick days taken?

Accepted Answer

6

Answer

The range is the maximum minus the minimum: 8 − 2 = 6 days.

Question 3

A bar graph shows that a department reduced processing errors from 480 to 312 over one year. By approximately what percentage were errors reduced?

Accepted Answer

35%

Answer

The reduction of 168 divided by the original 480 equals 35%, so errors were reduced by 35%.

Question 4

A report compares two data collection methods. Method A surveyed 400 people with a 5% margin of error; Method B surveyed 1,600 people with a 2.5% margin of error. Which method provides more precise results and why?

Accepted Answer

Method B, because a larger sample reduces the margin of error

Answer

Method B is more precise because a larger sample size reduces sampling error, resulting in a smaller margin of error.

Question 5

A line graph shows weekly website visits: Week 1=2,100, Week 2=2,310, Week 3=2,541, Week 4=2,795. Which statement best describes this trend?

Accepted Answer

Exponential-like growth of approximately 10% per week

Answer

Each week's visits are approximately 110% of the prior week, indicating consistent ~10% weekly growth rather than a fixed amount.

Ohio Civil Service Exam Practice Test

Ohio Civil Service Exam Practice Test

Ohio Civil Service Exam Data Interpretation and Analysis 5