MIA · Mixed set · Unit 7

1. 1.

   Is this a statistical question? “How many minutes do sixth graders spend on homework?”

   Answer. statistical — answers vary

   statistical — answers vary

2. 2.

   The dot plot shows hours of sleep. How many students slept 8 hours?

   Answer. 4

   Count the dots above 8: 4.

3. 3.

   Find the IQR of 7, 8, 9, 11, 13, 14, 16.

   Answer. 6

   Q1 = 8, Q3 = 14, IQR = 14 − 8 = 6.

4. 4.

   Find the mean of 6, 8, 10, 12.

   Answer. 9

   Sum = 36; divide by 4 → 9.

5. 5.

   A data set of 9 quiz scores has one score of 0 and the rest near 18. Which measure of center is more resistant to that 0: mean or median? Write a complete answer — Luis will compare with a partner.

   Answer. median

   The median depends on the middle value, not the size of an outlier.

6. 6.

   Is this a statistical question? “What is 7 × 8?” Write a complete answer — Priya will compare with a partner.

   Answer. not statistical — one correct value

   not statistical — one correct value

7. 7.

   The dot plot shows hours of sleep. How many students slept 9 hours? Then Jonah needs 5 of that amount. What is the total they need?

   Answer. 5

   Count the dots above 9: 1. Then multiply by 5: 5.

8. 8.

   Find the IQR of 7, 8, 9, 11, 13, 14, 16. Then Owen needs 3 of that amount. What is the total they need?

   Answer. 18

   Q1 = 8, Q3 = 14, IQR = 14 − 8 = 6. Then multiply by 3: 18.

9. 9.

   The data set is 4, 6, 10, 12. The mean is 8. Find the MAD. Then Priya needs 3 of that amount. What is the total they need?

   Answer. 9

   Mean of the distances from 8 is 3. Then multiply by 3: 9.

10. 10.

    A data set of 9 quiz scores has one score of 0 and the rest near 18. Which measure of center is more resistant to that 0: mean or median? Write a complete answer — Owen will compare with a partner.

    Answer. median

    The median depends on the middle value, not the size of an outlier.

11. 11.

    Think

    Nora tried this problem:
    Is this a statistical question? “What is 7 × 8?”
    Nora wrote not statistical — one correct value (check this). That is not correct. What is the right answer?

    Answer. not statistical — one correct value

    Nora’s answer not statistical — one correct value (check this) is off. not statistical — one correct value

12. 12.

    Think

    Sam tried this problem:
    The dot plot shows hours of sleep. How many students slept 7 hours?
    Sam wrote 2. That is not correct. What is the right answer?

    Answer. 1

    Sam’s answer 2 is off. Count the dots above 7: 1.

Original extra practice. Keys are computed from the items, not guessed.