n in Test Fall 2016 MATH 2201 Quiz 11 DEMARCO JACKSON Question 1 of 5 Step 1 of

Question

n in Test Fall 2016 MATH 2201 Quiz 11 DEMARCO JACKSON Question 1 of 5 Step 1 of 2 76:04:15 A random sample of 201 fields of durum wheat has a mean yield of 40.3 bushels per acre and standard deviation of 5.22 bushels per acre. Determine the 90 % confidence interval for the true mean yield. Assume the population is normally distributed. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places. Keypad: Answer(How to Enter) 4 Points Next com/Portal/fest/testaketesta Show 051 AM ^ 12/3/201. to search Joe9

Explanation / Answer

x_bar = 40.3

sd= 5.22

n=201

90% CI :

(x_bar-z_alpha/2 * sigma/sqrt(n) , x_bar+z_alpha/2 * sigma/sqrt(n) )

( 40.3-1.645*5.22/sqrt(201) , 40.3+1.645*5.22/sqrt(201) )

(39.694 , 40.9056)

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