## theopenstudyowl one year ago statzzz

1. theopenstudyowl

@Michele_Laino

2. theopenstudyowl

I was wondering if you could check my answers...

3. theopenstudyowl

4. theopenstudyowl

thanks!

5. Michele_Laino

question #4, I got $\Large \left( {0.7242,\quad 0.8358} \right)$

6. nuccioreggie

Solve negative 7 over 3, the whole multiplied by x minus 3 equals negative 52. 21 39 45 59

7. nuccioreggie

Need help

8. Michele_Laino

question #9 I got 2401, namely the last option. Please you have to reply, since I can not give you the answer directly

9. theopenstudyowl

ok sorry

10. theopenstudyowl

i just got back

11. theopenstudyowl

and got it and thanks

12. theopenstudyowl

are you on 10?

13. nuccioreggie

Help

14. Michele_Laino

question #10 my definition of error margin m, is: $m = \frac{{\Delta a}}{a}$ where a is the mean value, and \Delta a is the uncertainty on a

15. Michele_Laino

how have you defined the error margin?

16. theopenstudyowl

ok

17. nuccioreggie

Ok ill wait

18. theopenstudyowl

@Michele_Laino are all the others right?

19. Michele_Laino

I'm pondering...

20. theopenstudyowl

ok np

21. Michele_Laino

for example, in question #3 how do you got 745?

22. Michele_Laino

can you write your steps, in order to get 745?

23. theopenstudyowl

it was so long ago when I did these i forgot the steps but remembered the ansers that is why im asking for u to check them lol

24. Michele_Laino

ok! do you remember the definition of error margin?

25. Michele_Laino

question #3 the standard deviation is: 11.534 so the 95% confidence interval is 11.534* 1.65 = 19

26. theopenstudyowl

ok thnxs sorry for the late reply

27. nuccioreggie

The graph below shows the prices of different numbers of boots at a store: A graph is shown. The values on the x axis are 0, 2, 4, 6, 8, and 10. The values on the y axis are 0, 25, 50, 75, 100, and 125. Points are shown on ordered pairs 0, 0 and 2, 25 and 4, 50 and 6, 75 and 8, 100. These points are connected by a line. The label on the x axis is Number of Boots. The title on the y axis is Price in dollars. Which equation can be used to determine p, the cost of b boots? p = 12.50b p = 25b b = 25p b = 12.50p

28. Michele_Laino

question #5 I got 261, namely, close to the first option

29. Michele_Laino

question #3 I got n=751

30. theopenstudyowl

nice and thnxs!

31. Michele_Laino

question #6 I think you are right! we have to determine the new proportion

32. Michele_Laino

question #10 hint: the formula for margin error, is: $\Large m = {z^*}\sqrt {\frac{{p\left( {1 - p} \right)}}{n}}$ where p is the sample proportion, n is the sample size, and z* is the value which comes from the percentage of the confidence level

33. Michele_Laino

question #7 I got: $\Large \left( {0.24316,\quad 0.35684} \right)$

34. Michele_Laino

the procedure is the same as in the first exercise, we have to apply the binomial distribution

35. Michele_Laino

36. theopenstudyowl

awesome! thnxs

37. Michele_Laino

finally, for question #9, I have applied the subsequent formula: $\Large \frac{{1.96}}{{\sqrt n }} = 0.04$

38. Michele_Laino

our homework is completed!

39. theopenstudyowl

yah!!1 can u help later? if so, can u give the hours your online

40. Michele_Laino

I will stay here for at least 2 hours

41. theopenstudyowl

ok cool can u help some more then plz?

42. Michele_Laino

ok!

43. theopenstudyowl

one second plz, give me 10 minutes before i upload some more and ty soo much

44. theopenstudyowl

@Michele_Laino , is #10 right?

45. Michele_Laino

question #10 I give this hint: $m = {z^*}\sqrt {\frac{{p\left( {1 - p} \right)}}{n}}$ m is the margin of error, p is the sample proportion, n is the sample size, and z* is coming from the percentage of confidence level, namely if confidence level is 95%, then z*=1.96, if confidence level is 90%, then z*=1.65

46. Michele_Laino

I think option 3 only

47. theopenstudyowl

ok