If Two Random Samples of Sizes 30 and 36 Are $\bar { X } _ { 1 }$

question 111

Multiple Choice

If two random samples of sizes 30 and 36 are selected independently from two populations with means 78 and 85, and standard deviations 12 and 15, respectively, then the standard error of the difference $\bar { X } _ { 1 }$ and $\bar { X } _ { 2 }$ is equal to:

• A)0.904
• B)3.324
• C)3.391
• D)0.833

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Definitions:

Red Bone Marrow

Red bone marrow is the soft tissue in the interior of bones where blood cells are produced, including red cells, white cells, and platelets.

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The period of development of the fetus from conception until birth.

Neonatal Thrombocytopenia

A condition in newborns characterized by a lower than average number of platelets in the blood, which can lead to bleeding problems.

Exchange Transfusion

A blood transfusion process where the patient's blood or components are removed and replaced with donor blood or plasma.