رد: اسّـتبدّ بي‘ الجنونْ ’’ [ مُساعدة‘ في الإحصاء ] :’’’(
بلييييز فهموني كيف انحلت هاذي الاسئله
Find two z values so that 44% of the middle area is bounded by them.
• Look at the corresponding value of 0.22.
• z = +0.58 and z = -0.58 are the two values of z.
Find two z values, one positive and one negative, so that the areas in the two tails total the
following values.
a. 5%
• Look at the corresponding value of (0.5000 - 0.0250 = 0.4750).
• z = +1.96 and z = -1.96 are the two values of z.
b. 10%
• Look at the corresponding value of (0.5000 – 0.0500 = 0.4500).
• z = +1.645 and z = -1.645 are the two values of z.
c. 1%
• Look at the corresponding value of (0.5000 – 0.0050 = 0.4950).
• z = +2.575 and z = -2.575 are the two values of z.
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