For her study (n= 50), a researcher determines thatM= 42 and 37.5 3.5 ( ). Compute the one-independent sampleztest. What are the upper and lower confidence limits?

a.[42.83, 41.17]

b.[42.96, 41.04]

c.[42.61, 41.39]

d.[42.57, 41.43]