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Statıstıcs Iı Deneme Sınavı Sorusu #974328
Statıstıcs Iı Deneme Sınavı Sorusu #974328
The independent random sample sizes are n1 = 180 students and n2 =200 students. Also, the sample mean grades are 80 and 90. Population standard deviations are 20 and 40 respectively. What is the z value for the hypothesis testing?
The independent random sample sizes are n1 = 180 students and n2 =200 students. Also, the sample mean grades are 80 and 90. Population standard deviations are 20 and 40 respectively. What is the z value for the hypothesis testing?
|
-3.45 |
|
-4.59 |
|
-7.6 |
|
-0.89 |
|
-1.82 |
Yanıt Açıklaması:
(80-90) / sqrt( 20^2/180 + 40^2/200) =-1.82
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