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Grade 8 Quiz: Data, Statistics & Probability — Easy Version 2
Grade 8 · Whoobee Name: ____________________ Date: __________
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.
How to solve
This quiz mixes questions from different lessons, like a real test. Read each question carefully: the lesson name in front tells you what kind of problem it is. Check your answers, then practise the lessons where you made mistakes.
Example
Two-Way Tables & Relative Frequency: How many shoppers are "Weekday" and "Paid in cash"?
| Paid by card | Paid in cash | Total | |
|---|---|---|---|
| Weekday | 18 | 7 | 25 |
| Weekend | 9 | 4 | 13 |
| Total | 27 | 11 | 38 |
Answer: 7
| Walks to school | Rides to school | Total | |
|---|---|---|---|
| Grade 7 | 12 | ? | 30 |
| Grade 8 | 15 | 18 | 33 |
| Total | 27 | 36 | 63 |
Not quite. The answer is
💡 The "Grade 7" row adds up to 30, and the other number in that row is 12. Subtract: 30 − 12 = 18. Check down the "Rides to school" column: 18 + 18 = 36. The missing number is 18.
✓ Correct!
Not quite. The answer is
💡 The "Grade 7" row adds up to 30, and the other number in that row is 12. Subtract: 30 − 12 = 18. Check down the "Rides to school" column: 18 + 18 = 36. The missing number is 18.
💡 How to solve: Two-Way Tables & Relative Frequency
Each cell counts the people in one row category and one column category; the totals add across rows and down columns. A relative frequency is a count divided by a total: divide by the row total to compare within a row, by the column total within a column, or by the grand total for the whole survey.
Try a similar one
How many students were surveyed in all?
| Walks to school | Rides to school | Total | |
|---|---|---|---|
| Grade 7 | 19 | 22 | 41 |
| Grade 8 | 11 | 21 | 32 |
| Total | 30 | 43 | 73 |
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The points are spread out with no upward or downward trend: house number does not help predict pets. So there is no association.
✓ Correct!
Not quite. The answer is
💡 The points are spread out with no upward or downward trend: house number does not help predict pets. So there is no association.
💡 How to solve: Scatter Plots & Association
If the points tend to rise from left to right, the association is positive; if they tend to fall, it is negative; if there is no clear pattern, there is no association. If the points cluster around a straight line the association is linear, and if they follow a curve it is nonlinear. An outlier is a point far away from the rest of the data.
Try a similar one
Describe the association: positive, negative, or no association?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
| Likes pizza best | Likes tacos best | Total | |
|---|---|---|---|
| Adults | 25 | 7 | 32 |
| Teens | 23 | 11 | 34 |
| Total | 48 | 18 | 66 |
Not quite. The answer is
💡 Add the four counts inside the table: 25 + 7 + 23 + 11 = 66. That is also the grand total in the bottom-right corner. 66 people were surveyed.
✓ Correct!
Not quite. The answer is
💡 Add the four counts inside the table: 25 + 7 + 23 + 11 = 66. That is also the grand total in the bottom-right corner. 66 people were surveyed.
💡 How to solve: Two-Way Tables & Relative Frequency
Each cell counts the people in one row category and one column category; the totals add across rows and down columns. A relative frequency is a count divided by a total: divide by the row total to compare within a row, by the column total within a column, or by the grand total for the whole survey.
Try a similar one
How many campers were surveyed in all?
| Likes hiking | Dislikes hiking | Total | |
|---|---|---|---|
| Swims | 24 | 18 | 42 |
| Does not swim | 13 | 12 | 25 |
| Total | 37 | 30 | 67 |
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The points rise from left to right: as distance goes up, taxi fare tends to go up. So the association is positive.
✓ Correct!
Not quite. The answer is
💡 The points rise from left to right: as distance goes up, taxi fare tends to go up. So the association is positive.
💡 How to solve: Scatter Plots & Association
If the points tend to rise from left to right, the association is positive; if they tend to fall, it is negative; if there is no clear pattern, there is no association. If the points cluster around a straight line the association is linear, and if they follow a curve it is nonlinear. An outlier is a point far away from the rest of the data.
Try a similar one
Describe the association: positive, negative, or no association?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
| Likes pizza best | Likes tacos best | Total | |
|---|---|---|---|
| Adults | 23 | 6 | 29 |
| Teens | 25 | 21 | 46 |
| Total | 48 | 27 | 75 |
Not quite. The answer is
💡 The "Adults" row and the "Likes pizza best" column meet at 23. So 23 people are both.
✓ Correct!
Not quite. The answer is
💡 The "Adults" row and the "Likes pizza best" column meet at 23. So 23 people are both.
💡 How to solve: Two-Way Tables & Relative Frequency
Each cell counts the people in one row category and one column category; the totals add across rows and down columns. A relative frequency is a count divided by a total: divide by the row total to compare within a row, by the column total within a column, or by the grand total for the whole survey.
Try a similar one
How many people were surveyed in all?
| Likes pizza best | Likes tacos best | Total | |
|---|---|---|---|
| Adults | 8 | 3 | 11 |
| Teens | 24 | 24 | 48 |
| Total | 32 | 27 | 59 |
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The other points lie close to a line going down about 1 unit for each step right. At x = 7 that line is near y = 4, but this point has y = 9, 5 units above it. So the outlier is (7, 9).
✓ Correct!
Not quite. The answer is
💡 The other points lie close to a line going down about 1 unit for each step right. At x = 7 that line is near y = 4, but this point has y = 9, 5 units above it. So the outlier is (7, 9).
💡 How to solve: Scatter Plots & Association
If the points tend to rise from left to right, the association is positive; if they tend to fall, it is negative; if there is no clear pattern, there is no association. If the points cluster around a straight line the association is linear, and if they follow a curve it is nonlinear. An outlier is a point far away from the rest of the data.
Try a similar one
Describe the association: positive, negative, or no association?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
| Paid by card | Paid in cash | Total | |
|---|---|---|---|
| Weekday | 6 | 23 | 29 |
| Weekend | 22 | 13 | 35 |
| Total | 28 | 36 | 64 |
Not quite. The answer is
💡 Add the four counts inside the table: 6 + 23 + 22 + 13 = 64. That is also the grand total in the bottom-right corner. 64 shoppers were surveyed.
✓ Correct!
Not quite. The answer is
💡 Add the four counts inside the table: 6 + 23 + 22 + 13 = 64. That is also the grand total in the bottom-right corner. 64 shoppers were surveyed.
💡 How to solve: Two-Way Tables & Relative Frequency
Each cell counts the people in one row category and one column category; the totals add across rows and down columns. A relative frequency is a count divided by a total: divide by the row total to compare within a row, by the column total within a column, or by the grand total for the whole survey.
Try a similar one
How many campers were surveyed in all?
| Likes hiking | Dislikes hiking | Total | |
|---|---|---|---|
| Swims | 5 | 24 | 29 |
| Does not swim | 25 | 9 | 34 |
| Total | 30 | 33 | 63 |
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The points fall from left to right: as speed goes up, travel time tends to go down. So the association is negative.
✓ Correct!
Not quite. The answer is
💡 The points fall from left to right: as speed goes up, travel time tends to go down. So the association is negative.
💡 How to solve: Scatter Plots & Association
If the points tend to rise from left to right, the association is positive; if they tend to fall, it is negative; if there is no clear pattern, there is no association. If the points cluster around a straight line the association is linear, and if they follow a curve it is nonlinear. An outlier is a point far away from the rest of the data.
Try a similar one
Describe the association: positive, negative, or no association?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
| Likes hiking | Dislikes hiking | Total | |
|---|---|---|---|
| Swims | 3 | ? | 24 |
| Does not swim | 16 | 13 | 29 |
| Total | 19 | 34 | 53 |
Not quite. The answer is
💡 The "Swims" row adds up to 24, and the other number in that row is 3. Subtract: 24 − 3 = 21. Check down the "Dislikes hiking" column: 21 + 13 = 34. The missing number is 21.
✓ Correct!
Not quite. The answer is
💡 The "Swims" row adds up to 24, and the other number in that row is 3. Subtract: 24 − 3 = 21. Check down the "Dislikes hiking" column: 21 + 13 = 34. The missing number is 21.
💡 How to solve: Two-Way Tables & Relative Frequency
Each cell counts the people in one row category and one column category; the totals add across rows and down columns. A relative frequency is a count divided by a total: divide by the row total to compare within a row, by the column total within a column, or by the grand total for the whole survey.
Try a similar one
How many students were surveyed in all?
| Has a pet | No pet | Total | |
|---|---|---|---|
| Plays a sport | 12 | 14 | 26 |
| No sport | 19 | 13 | 32 |
| Total | 31 | 27 | 58 |
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The points rise from left to right: as distance goes up, taxi fare tends to go up. So the association is positive.
✓ Correct!
Not quite. The answer is
💡 The points rise from left to right: as distance goes up, taxi fare tends to go up. So the association is positive.
💡 How to solve: Scatter Plots & Association
If the points tend to rise from left to right, the association is positive; if they tend to fall, it is negative; if there is no clear pattern, there is no association. If the points cluster around a straight line the association is linear, and if they follow a curve it is nonlinear. An outlier is a point far away from the rest of the data.
Try a similar one
Describe the association: positive, negative, or no association?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Grade 8 Quiz: Data, Statistics & Probability — Easy Version 2
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.