Saturday
December 20, 2014

Homework Help: Statistics

Posted by KEENE on Friday, February 6, 2009 at 7:38am.

I have a couple questions I answer for home work could some look atthem and tell me If I am doing them right I also am having problems understanding the variance and standard deviation are the site you can suggest that would help with this I need a step by step help

11. For the following scores, find the (a) mean,
Usually the best measure of central tendency is the ordinary average, the sum of all
the scores divided by the number of scores. In statistics, this is called the mean. The
average, or mean, of a group of scores is a representative value.
2+ 2 +0 + 5 + 1+ 4+ 1+ 3+ 0+ 0+ 1+ 4+ 4+ 0+ 1+ 4+ 3+ 4+ 2+ 1+ 0= 42
42/21=2

(b) median, Another alternative to the mean is the median. If you line up all the scores from
lowest to highest, the middle score is the median.

0 ,0,0,0,0, 1,1,1,1,1,2,2,2,3,3,4,4,4,4,4,5
Median 2





(c) sum of squared deviations,
0x0=0, 1x1=1, 2x2=4,3x3=9, 4x4=16, 5x5=25
0+0+0+0+0+1+1+1+1+1+4+4+4+9+9+16+16+16+16+16+25= 140

(d) variance

(e) standard deviation:

14.

On a standard measure of hearing ability, the mean is 300 and the standard deviation
is 20. Give the Z scores for persons who score
(a) 340

z=(340-300)/(20)

z=(40)/(20)

z=2

(b) 310

z=(310-300)/(20)

z=(10)/(20)

z=(1)/(2)


(c)260.

z=(260-300)/(20)

z=(-40)/(20)

z=-(40)/(20)

z=-2


Give the raw scores for persons whose Z scores on this test are
(d) 2.4

2.4*20+300=x

x=2.4*20+300

x=48+300

x=348

(e)1.5

1.5*20+300=x

x=1.5*20+300

x=30+300

x=330

(f) 0

0*20+300=x

x=0*20+300

x=0+300

x=300

(g) -4.5.

-4.5*20+300=x

x=-4.5*20+300

x=-90+300

x=210

any help would be appreciated
Thank you

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