Test 1 Review 2

Observe the frequency distribution:

Estimate the class width.

• 11

• 10

• 25

• 19.5

Observe the frequency distribution:

What is the cumulative frequency of the third class?

• f_{1 +} f₂ + f₃ = 5 + 8 + 6 = 19

• f_{1 +} f₂ + f₃ = 5 + 6 + 10 = 21

• f_{1 +} f₂ + f₃ = 1 + 6 + 11 = 18

Observe the frequency distribution:

What is the midpoint of the first class?

• 4

• 5

• 1

• 3

Is a histogram the same as a bar graph?

• Yes, because they both use intervals.
• No, because a histogram displays numerical data while a bar graph displays categorical data.
• Yes, because they both use bars to display data.
• No, because a histogram displays categorical data while a bar graph displays numerical data.

Describe the data distribution shape of the graph.

• Skewed right
• Skewed left
• Uniform
• Symmetrical

How would you describe this data?

• Skewed Left

• Skewed Right

• Symmetrical

• A total amount

Unit 10 Test Scores: 32, 54, 87, 84, 95, 72, 91, 75, 80, 72

Which number appears to be an outlier?

Unit 10 Test Scores: 32, 54, 87, 84, 95, 72, 91, 75, 80, 72

Find IQR.

Composite scores on the ACT are normally distributed with a mean of 21 and standard deviation of 5.

Find the z-score for a student that scores a 28.

Which interval shows 95% of the data given a mean of 15 and a standard deviation of 3? 

• 9 to 21
• 12 to 18
• 6 to 24
• 13 to 16