subtracting Standard deviation of the mean

Statistics
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Calculate σM1 - M2 for a study of self-esteem between the sexes, in which the value of σM for women is 1.32 and that for men is 1.94. (choices: 1.02, 3.76, 2.35, or 7.63)

In a study of the effect of a new drug on the alleviation of asthma symptoms, the σM for symptom relief in the patient group that received the new drug is 1.45, and the σM  for symptom relief in the group that did not receive the new drug is 1.22.  Calculate σ M1-M2 (Choices: 1.89, 1.77, 1.93, or 1.79)

Apr 12th, 2015

Std deviation of difference of mean M1,M2 is given by squareroot of (1.32^2 + 1.94^2)= 2.35

Std deviation of difference of mean M1,M2 is given by squareroot of (1.45^2 + 1.22^2)= 1.89

Apr 12th, 2015

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Apr 12th, 2015
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Apr 12th, 2015
Dec 3rd, 2016
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