Suppose a sample of 49 paired differences that have been randomly selected from a normally distributed population of paired differences yields a sample mean of d⎯⎯=4.2 and a sample standard deviation of sd = 7.6. (a) calculate a 95 percent confidence interval for µd = µ1 – µ2. can we be 95 percent confident that the difference between µ1 and µ2 is greater than 0?

the answer is a

step-by-step explanation:

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this is a good question! i'll do some research and come back when i have the answer!

1) the property is   ixi = a ⇔x = a   o x = -a

4(x-5)+3= 15⇒4x-20+3 = 15⇒4x-17= 15⇒4x = 15+17⇒4x = 32⇒x =32/4= 8

4(x-5) +3= -15⇒4x-20 +3 = -15⇒4x-17= -15⇒4x =-15+17⇒4x = 2⇒x =2/4= 1/2

the values are x =8 and x = 0,5