7. when n < 30 and is unknown we perform a t-test.
100(1-)% confidence interval for the population mean:
8. n = 16
df = n-1 = 15
Using excel function : = T.INV.2T(0.01,15)
Answer d.
If n < 30 and σ İs unknown, then the 100(1-α)% confidence interval for a population...
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