Degrees of freedom = 20 - 1 = 19
T score for 90% confidence interval = t0.05,19 = 1.729
Confidence interval = (x bar + t * s / sqrt(n))
= (41.5 + 1.729 * 3 / sqrt(20))
= (41.5 + 1.16)
= (40.34 to 42.66)
A random sample of 20 acres gave a mean yield of wheat equal to 41.5 bushels...
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