## anonymous one year ago help!!

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1. anonymous

The dot plots below show the test scores of seventh- and eighth-grade students: src=" http://learn.flvs.net/webdav/assessment_images/educator_mjmath2_v14/mjmath2_practice_m8_g7_p.jpg " Based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score? Grade 7 Grade 8 Both groups show about the same mean score. No conclusion about mean score can be made from the data.

2. Phebe

@Nnesha

3. Phebe

i cant sorry

4. Phebe

i dont even see your dotted line thing it said error

5. Phebe

6. anonymous

7. anonymous

sorry cant help the page u added on ur question keeps saying error

8. anonymous

OMG!!

9. anonymous

wait do you have kik i cant take a pic and send it to you??

10. anonymous

*can

11. anonymous

nope i have hangout

12. anonymous

what is that?

13. Phebe

i got both jus cant get on kik tho

14. anonymous

15. anonymous

16. anonymous

17. anonymous

for hangout

18. anonymous

yes

19. anonymous

The price of some houses in a neighborhood are shown below: House Price A $120,000 B$130,000 C $140,000 D$150,000 E \$1,110,000 Based on the data, should the mean or the median be used to make an inference about the price of the houses in the neighborhood? Median, because there is an outlier that affects the mean Mean, because there are no outliers that affect the mean Median, because it is in the center of the data Mean, because it is in the center of the data

20. anonymous

Median, because it is in the center of the data

21. anonymous

thank you!!

22. anonymous

The following table shows the data collected from a random sample of 100 middle school students on the number of hours they play outdoor games every week: Weekly Duration of Outdoor Games Time (in hours) 0–2 3–5 6–8 9–11 Number of Students 30 62 8 0 There are 1,200 students in the school. Based on the sample proportion, how many students in the school would be expected to play outdoor games for at least three hours every week? 744 840 960 1,104

23. anonymous

idk this one

24. anonymous

Jack wants to know how many families in his small neighborhood of 60 homes would help organize a neighborhood fund-raising party. He put all the addresses in a bag and drew a random sample of 30 addresses. He then asked those families if they would help organize the fund-raising party. He found that 12% of the families would help organize the party. He claims that 12% of the neighborhood families would be expected to help organize the party. Is this a valid inference? No, this is not a valid inference because he asked only 30 families No, this is not a valid inference because he did not take a random sample of the neighborhood Yes, this is a valid inference because he took a random sample of the neighborhood Yes, this is a valid inference because the 30 families speak for the whole neighborhood

25. anonymous

??

26. anonymous

Yes, this is a valid inference because he took a random sample of the neighborhood

27. anonymous

its still not letting me see it

28. anonymous

The following table shows the data collected from a random sample of 100 middle school students on the number of hours they play outdoor games every week: Weekly Duration of Outdoor Games Time (in hours) 0–2 3–5 6–8 9–11 Number of Students 30 62 8 0 There are 1,200 students in the school. Based on the sample proportion, how many students in the school would be expected to play outdoor games for at least three hours every week? 744 840 960 1,104

29. anonymous

@MTALHAHASSAN2

30. anonymous

@MTALHAHASSAN2 ??

31. MTALHAHASSAN2

yes

32. anonymous

33. MTALHAHASSAN2

wait a sec

34. MTALHAHASSAN2

let me think

35. anonymous

ok

36. MTALHAHASSAN2

I will say look at 3-5 hours, and the sample is from 100 students, and we have 62 students who play at least 3 - 5 hours a day. So that's 62%, just multiply 1200 by 62%.

37. anonymous

38. MTALHAHASSAN2

i am getting 744 but not sure if is it right or not

39. anonymous

ok, i got the same thing

40. MTALHAHASSAN2

i will say plz conform from someone else

41. MTALHAHASSAN2

by the which grade question is it??

42. anonymous

huh?

43. MTALHAHASSAN2

@Michele_Laino

44. Michele_Laino

the experimental frequency is: 62/100=0.62, so the requested number is: (62/100)*1200=...?

45. anonymous

?

46. Michele_Laino

the proportion of student which play outdoor games is: 62/100, namely 62 students over 100 students in total

47. anonymous

48. MTALHAHASSAN2

744

49. anonymous

ok thanks!! mind helpig me with a few more?

50. Michele_Laino

now we have to write that proportion for a sample of 1200 students, so the requested number of students, which play outdorr games, for a sample of 1200 students, is: $\Large \frac{{62}}{{100}} \cdot 1200 = ...?$

51. Michele_Laino

outdoor*

52. anonymous

<img src=" http://learn.flvs.net/webdav/assessment_images/educator_mjmath2_v14/mjmath2_practice_m8_g8_c2.jpg " alt=" Which of the following inferences can be made using the dot plots? Group X has a higher mean than group Y. Group Y has a higher mean than group X. There is no overlap between the data. The range of each group is different.

53. anonymous

@Michele_Laino @MTALHAHASSAN2

54. Michele_Laino

I'm sorry I see only an error message

55. MTALHAHASSAN2

same