NJSLA NJSLA Data Analysis and Statistics 2

Question 1

A data set has values: 4, 4, 6, 8, 10, 10, 14. What is the mode?

Accepted Answer

4 and 10

Answer

Both 4 and 10 appear twice, making this a bimodal data set with modes of 4 and 10.

Question 2

A probability experiment involves rolling a fair six-sided die. What is the probability of rolling a number greater than 4?

Accepted Answer

1/3

Answer

Numbers greater than 4 on a die are 5 and 6, giving 2 favorable outcomes out of 6 total, which simplifies to 1/3.

Question 3

A line graph shows sales rising from January to June and falling from June to December. What does the peak in June represent?

Accepted Answer

The maximum sales for the year

Answer

The highest point on the line graph in June represents the maximum (peak) value of sales during that year.

Question 4

In a class of 30 students, 18 play sports. What is the ratio of students who play sports to those who do not?

Accepted Answer

3:2

Answer

18 play sports and 12 do not; the ratio 18:12 simplifies to 3:2.

Question 5

Which statistic describes how spread out the values in a data set are from the mean?

Accepted Answer

Standard deviation

Answer

Standard deviation measures the average distance of each data point from the mean, quantifying how spread out the data is.

NJSLA Exam Practice Test