Question

please help with statistics question! http://prntscr.com/alcegq

Answer 1

do the formulas given in the hints look familiar and make sense?

Answer 2

not to me they don't, i have been trying it out but get nowhere

Answer 3

do you agree that the highest score is 25? I'm referring to the dot plot

Answer 4

yes

Answer 5

what is the lowest value on that same dotplot?

Answer 6

-18 ?

Answer 7

yes

So XH = 25 and XL = -18

subtracting the two values

XH - XL = ???

Answer 8

43

Answer 9

divided by 6 = 1.16

Answer 10

now divide that by 6 to compute the SD

Answer 11

ooops 7.16

Answer 12

7.16666666666667 roughly

Answer 13

now you'll use this SD value to plug into the ME formula

ME = margin of error

Answer 14

\[\Large ME = \pm 2 \times \frac{SD}{\sqrt{N}}\]
\[\Large ME \approx \pm 2 \times \frac{7.16666666666667}{\sqrt{50}}\]
\[\Large ME \approx ??\]

Answer 15

okay
I got 2.02704

Answer 16

which rounds to 2.03

Answer 17

great! thank you!

Answer 18

so the margin of error (ME) is roughly +-2.03

Answer 19

perfect