MIA · Mixed set · Unit 7

1. 1.

   Shoe size vs. quiz score for a class looks like a cloud with no trend. Association?

   Answer. none

   none

2. 2.

   A trend line is y = 6x + 8. Predict y when x = 10.

   Answer. 68

   y = 6(10) + 8 = 68.

3. 3.

   A table shows how 6th graders get to school: walk 9, bike 8, bus 13. How many students were surveyed?

   Walk	Bike	Bus
   9	8	13

   Answer. 30

   9 + 8 + 13 = 30.

4. 4.

   A two-way table records whether students play a sport (rows: Grade 7, Grade 8; columns: Yes, No). Grade 7: 15 yes, 12 no. Grade 8: 13 yes, 9 no. What fraction of all students play a sport?

   Yes	No
   G7 15	12
   G8 13	9

   Answer. 47

   Yes total 28 out of 49 = 47.

5. 5.

   As hours studied increase, test scores tend to increase. What kind of association? Write a complete answer — Jonah will compare with a partner.

   Answer. positive

   positive

6. 6.

   A trend line is y = 2x + 7. Predict y when x = 10. Then Theo needs 4 of that amount. What is the total they need?

   Answer. 108

   y = 2(10) + 7 = 27. Then multiply by 4: 108.

7. 7.

   A table shows how 6th graders get to school: walk 15, bike 7, bus 11. How many students were surveyed? Then Mei needs 4 of that amount. What is the total they need?

   Walk	Bike	Bus
   15	7	11

   Answer. 132

   15 + 7 + 11 = 33. Then multiply by 4: 132.

8. 8.

   A two-way table records whether students play a sport (rows: Grade 7, Grade 8; columns: Yes, No). Grade 7: 8 yes, 5 no. Grade 8: 9 yes, 12 no. What fraction of all students play a sport? Then Owen needs 5 of that amount. What is the total they need?

   Yes	No
   G7 8	5
   G8 9	12

   Answer. 212

   Yes total 17 out of 34 = 12. Then multiply by 5: 212.

9. 9.

   Shoe size vs. quiz score for a class looks like a cloud with no trend. Association? Write a complete answer — Luis will compare with a partner.

   Answer. none

   none

10. 10.

    A trend line is y = 5x + 2. Predict y when x = 6. Then Nora needs 2 of that amount. What is the total they need?

    Answer. 64

    y = 5(6) + 2 = 32. Then multiply by 2: 64.

11. 11.

    Think

    Mei tried this problem:
    A table shows how 6th graders get to school: walk 15, bike 8, bus 12. How many students were surveyed?
    Mei wrote 34. That is not correct. What is the right answer?

    Walk	Bike	Bus
    15	8	12

    Answer. 35

    Mei’s answer 34 is off. 15 + 8 + 12 = 35.

12. 12.

    Think

    Theo tried this problem:
    A two-way table records whether students play a sport (rows: Grade 7, Grade 8; columns: Yes, No). Grade 7: 9 yes, 11 no. Grade 8: 7 yes, 12 no. What fraction of all students play a sport?
    Theo wrote 1640. That is not correct. What is the right answer?

    Yes	No
    G7 9	11
    G8 7	12

    Answer. 1639

    Theo’s answer 1640 is off. Yes total 16 out of 39 = 1639.

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