Question

Question 6 of 8, Step 1 of 2 13/24 Correct 2 A random sample of 61 fields of corn has a mean yield of 30.3 bushels per acre and standard deviation of 3.82 bushels per acre. Determine the 98 % 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. Answer How to enter your answer • Tables Keypad Keyboard Shortcuts

Answer 1

Given:

n = 61, Mean = 30.3, Standard deviation = SD = 3.82,

Confidence level = 98% = 0.98

$\alpha$ = 1 - Confidence level = 1 - 0.98 = 0.02

Critical value:

Z_$\alpha$/2 = Z _0.02/2 = $\pm$ 2.326 ....................Using standard Normal table