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, | Home of Engineers

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,

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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 and is equal to:Selected Answer:0.833 (wrong answer)

Can you help me understand my wrong answer? I used sqrt(12^2/30)+(15^2/36)

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