anonymous
  • anonymous
(3.13) Use Table A to find the value z of a standard Normal variable that satisfies each of the following conditions. (Use the value of z from Table A that comes closest to satisfying the condition.) In each case, sketch a standard Normal curve with your value of z marked on the axis. The point z with 20% of the observations falling below it. A. 0.84 B. -0.84 C. 0.85 D. -0.85
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
http://ebooks.bfwpub.com/bps6e/frontmatter/bps6e_tables.pdf
amistre64
  • amistre64
since your z table is already setup for "area" to the left of z; you just have to match a field entry closest to .2000
amistre64
  • amistre64
your table appears to be defunct ....

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anonymous
  • anonymous
But how are they getting .84 or .85 ?
amistre64
  • amistre64
find 2 field values that are closest to .2000
amistre64
  • amistre64
.2005 > .2000 > .1997 do you agree? which one is it closer to?
anonymous
  • anonymous
.1997
amistre64
  • amistre64
2000+5 > 2000 > 2000-3 1997 since 3 is closer than 5
amistre64
  • amistre64
pfft, helps if a can read tho ... that what 1977?
amistre64
  • amistre64
.00 .01 .02 .03 .04 .05 .06 .07 .08 .09 ----------------------------------------------------------- || -0.8 || .2119 .2090 .2061 .2033 .2005 .1977 .1949 .1922 .1894 .1867 ^^ .2000
amistre64
  • amistre64
the 2005 is closer so use it: add the row value to the column value
anonymous
  • anonymous
oh! I see now.
amistre64
  • amistre64
yeah, its pretty simple once you understand the formating :)
anonymous
  • anonymous
The point z with 20% of the observations falling above it. would it be -0.85 for that
amistre64
  • amistre64
falling ABOVE it? or below it?
anonymous
  • anonymous
Well, first question was below it and the second above it.
amistre64
  • amistre64
-0.84 is the closest z value to 20% below the mirror image nature of the distribution tho would indicate that: 0.84 is the closest z value to 20% above
amistre64
  • amistre64
look at z=0.84; row .8 col .04 and see that it is .2005
amistre64
  • amistre64
well, +.5000
anonymous
  • anonymous
It is.
amistre64
  • amistre64
i still think your table is still defunct ....
amistre64
  • amistre64
|dw:1370374764341:dw|
anonymous
  • anonymous
wait .5000 is at z = 0 and .00
amistre64
  • amistre64
since the total % under the curve is 100 and we are measuring left tails: -z = 20% +z = 80%, or 100 - 20
amistre64
  • amistre64
.5000 is 50% and is the mean yes; a standard score of 0 is at the mean
amistre64
  • amistre64
the closest feild value to 100-20: or 80% is still going to be +.84
anonymous
  • anonymous
Got it
anonymous
  • anonymous
This helps alot!
amistre64
  • amistre64
with a little practice, youll be as confused as me :) good luck
anonymous
  • anonymous
Thank you so much! I'll keep working on some more problems to understand it well for test in two days. Summer classes just go too fast.

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