for Whoobee's shop
Grade 8 Quiz: Data, Statistics & Probability — Easy Version 1
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
Not quite. The answer is
💡 The other points lie close to a line going up about 1 unit for each step right. At x = 3 that line is near y = 4, but this point has y = 9, 5 units above it. So the outlier is (3, 9).
✓ Correct!
Not quite. The answer is
💡 The other points lie close to a line going up about 1 unit for each step right. At x = 3 that line is near y = 4, but this point has y = 9, 5 units above it. So the outlier is (3, 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.
| Likes pizza best | Likes tacos best | Total | |
|---|---|---|---|
| Adults | 3 | 6 | 9 |
| Teens | ? | 17 | 26 |
| Total | 12 | 23 | 35 |
Not quite. The answer is
💡 The "Teens" row adds up to 26, and the other number in that row is 17. Subtract: 26 − 17 = 9. Check down the "Likes pizza best" column: 3 + 9 = 12. The missing number is 9.
✓ Correct!
Not quite. The answer is
💡 The "Teens" row adds up to 26, and the other number in that row is 17. Subtract: 26 − 17 = 9. Check down the "Likes pizza best" column: 3 + 9 = 12. The missing number is 9.
💡 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 | 11 | 10 | 21 |
| Teens | 13 | 14 | 27 |
| Total | 24 | 24 | 48 |
✓ 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 temperature goes up, drinks sold tends to go up. So the association is positive.
✓ Correct!
Not quite. The answer is
💡 The points rise from left to right: as temperature goes up, drinks sold 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.
| Reads daily | Does not read daily | Total | |
|---|---|---|---|
| Has a phone | 3 | 16 | 19 |
| No phone | 10 | 7 | 17 |
| Total | 13 | 23 | 36 |
Not quite. The answer is
💡 The "No phone" row and the "Reads daily" column meet at 10. So 10 students are both.
✓ Correct!
Not quite. The answer is
💡 The "No phone" row and the "Reads daily" column meet at 10. So 10 students 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 students were surveyed in all?
| Has a pet | No pet | Total | |
|---|---|---|---|
| Plays a sport | 5 | 5 | 10 |
| No sport | 9 | 14 | 23 |
| Total | 14 | 19 | 33 |
✓ 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.
| Has a pet | No pet | Total | |
|---|---|---|---|
| Plays a sport | 6 | 19 | 25 |
| No sport | 11 | 19 | 30 |
| Total | 17 | 38 | 55 |
Not quite. The answer is
💡 Add the four counts inside the table: 6 + 19 + 11 + 19 = 55. That is also the grand total in the bottom-right corner. 55 students were surveyed.
✓ Correct!
Not quite. The answer is
💡 Add the four counts inside the table: 6 + 19 + 11 + 19 = 55. That is also the grand total in the bottom-right corner. 55 students 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 students were surveyed in all?
| Has a pet | No pet | Total | |
|---|---|---|---|
| Plays a sport | 9 | 4 | 13 |
| No sport | 10 | 20 | 30 |
| Total | 19 | 24 | 43 |
✓ 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 height goes up, arm span tends to go up. So the association is positive.
✓ Correct!
Not quite. The answer is
💡 The points rise from left to right: as height goes up, arm span 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.
| Has a pet | No pet | Total | |
|---|---|---|---|
| Plays a sport | 8 | 19 | 27 |
| No sport | 11 | ? | 30 |
| Total | 19 | 38 | 57 |
Not quite. The answer is
💡 The "No sport" row adds up to 30, and the other number in that row is 11. Subtract: 30 − 11 = 19. Check down the "No pet" column: 19 + 19 = 38. The missing number is 19.
✓ Correct!
Not quite. The answer is
💡 The "No sport" row adds up to 30, and the other number in that row is 11. Subtract: 30 − 11 = 19. Check down the "No pet" column: 19 + 19 = 38. The missing number is 19.
💡 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 shoppers were surveyed in all?
| Paid by card | Paid in cash | Total | |
|---|---|---|---|
| Weekday | 5 | 8 | 13 |
| Weekend | 19 | 10 | 29 |
| Total | 24 | 18 | 42 |
✓ 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 height goes up, arm span tends to go up. So the association is positive.
✓ Correct!
Not quite. The answer is
💡 The points rise from left to right: as height goes up, arm span 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.
| Paid by card | Paid in cash | Total | |
|---|---|---|---|
| Weekday | 11 | 6 | 17 |
| Weekend | 6 | ? | 9 |
| Total | 17 | 9 | 26 |
Not quite. The answer is
💡 The "Weekend" row adds up to 9, and the other number in that row is 6. Subtract: 9 − 6 = 3. Check down the "Paid in cash" column: 6 + 3 = 9. The missing number is 3.
✓ Correct!
Not quite. The answer is
💡 The "Weekend" row adds up to 9, and the other number in that row is 6. Subtract: 9 − 6 = 3. Check down the "Paid in cash" column: 6 + 3 = 9. The missing number is 3.
💡 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 shoppers were surveyed in all?
| Paid by card | Paid in cash | Total | |
|---|---|---|---|
| Weekday | 16 | 10 | 26 |
| Weekend | 13 | 15 | 28 |
| Total | 29 | 25 | 54 |
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Log in to save your progress.
Grade 8 Quiz: Data, Statistics & Probability — Easy Version 1
Answer every question. The lesson name before each question tells you which skill it checks — open that lesson if you need a reminder.