Please help explain

1. A researcher wants to test the claim that the average salary of tattoo artists is greater than $48,890. He selects a random sample of 25 of these artists and finds the (sample) mean to be $49,995, and he knows the (population) standard deviation is $3164. Is there sufficient evidence to support the claim (that the population mean is greater than $48,890) at alpha = 0.10? 2. A researcher wants to test the claim that the average salary of tattoo artists is different from $48,890. He selects a random sample of 16 of these artists and finds the (sample) mean to be $47,995, and he knows the (population) standard deviation is $3164. Is there sufficient evidence to support the claim (that the population mean is different from $48,890) at alpha = 0.10