On Rhea's twitter account her tweets over the years have averaged about 35 likes per tweet with a standard deviation of 10. Several of here tweets have recently gone viral. Rhea's last 20 tweets have been averaging 50 likes per tweet with a standard deviation of 5. Rhea wants to know if her recent viral tweets are increasing her average likes.  What statistical test should we use to test hypothesis? (Z-Test, One-Sample T-Test, Dependent Two-Sample, or Independent Two-Sample) Why?

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A: Given information Mean µ = 12.75 hours Standard deviation σ = 2.1 hours

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A:

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A: Given that, mean(μ)=10.25 standard deviation(σ)=2.3

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A:

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A: We have to test claim.

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A: