A previous study claims that the average time a teenager spends browsing his social media accounts is 6 hours with a standard deviation of 0.5 hours. A researcher wants to test whether this claim is true, so he conducted a survey on 100 teenagers and found out that the mean is 5.5 hours. Use a =0.05 what is the appropriate null hypothesis? (A) u<6 B H=6 D

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