Question: I think I did this correctly could I get a verification, also could I have an explanation for j? Forty newborn babies are measured for

I think I did this correctly could I get a verification, also could I have an explanation for j?

Forty newborn babies are measured for length. The sample mean is 18.5 inches. There is a known standard deviation of 4 inches. The population is assumed to be normal.

1. xbar =18.5

b.2. =4

c.3. n =40

Construct a 95% CI for the population mean of newborn babies length. State the EBM (error bound) and confidence interval.

d. EBM=1.240

e.C.I. lower17.3

f.C.I. higher19.7

Construct a 98% CI for the population mean of newborn babies length. State the EBM (error bound) and confidence interval.

g. EBM=1.474

h.C.I. lower17.0

i.C.I. higher20.0

j. What about if I decrease the sample size, what do you think will happen to the margin of error?

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