Arandom sample of 25 fields of rye has a mean yield of 31.2 bushels per acre and standard deviation of 6.99 bushels per acre. determine the 80% confidence interval for the true mean yield. assume the population is approximately normal. step 1 of 2: find the critical value that should be used in constructing the confidence interval. round your answer to three decimal places.

Critical value is 1.318 and the confidence interval is 29.357 to  33.042

Step-by-step explanation:

n = 25

x = 31.2

s = 6.99

Degree of freedom = n-1= 25-1 =24

Confidence level = 0.8

So, α = 1- 0.8= 0.2

t critical =

Formula of confidence interval : to  

Confidence interval : to  

Confidence interval : to  

Hence critical value is 1.318 and the confidence interval is 29.357 to  33.042

sine

step-by-step explanation:

a 360 degree rotation

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