Solve the Problem $7.7$ And a Standard Deviation Of $4.5$ For One of the Populations and a Mean Of

Solve the problem.
-A variable of two populations has a mean of $7.7$ and a standard deviation of $4.5$ for one of the populations and a mean of $8.6$ and a standard deviation of $3.3$ for the other population. For independent samples of sizes 4 and 5, respectively, find the standard deviation of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$ . Round your answer to the nearest hundredth if necessary.

A) $3.73$
B) $1.2$
C) $2.79$
D) $7.79$

Correct Answer:

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