Turn in Test chapter eight test ARIEL WAGONER Question 3of7 Step 1 of 2 00:55:37

Question

Turn in Test chapter eight test ARIEL WAGONER Question 3of7 Step 1 of 2 00:55:37 A random sample of 6 fields of durum wheat the 80% confidence interval for the true mean yield Assume the population is has a mean yield of 45.5 bushels per acre and standard deviation of 7,43 bushels per acre. Determine 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 Answerow to Enter) 2 Points Keypad Next Prev ©2017Hawkes Learning Type here to search End PrtScn Home

Explanation / Answer

Sampling distribution of the mean of a normal distribution is also normal for all sample sizes.

We will use z statistic here.

For 0.2 significance level, zcrit = 1.282

Using excel function =NORM.INV(0.9, 0, 1)

Each tail has only 0.1 probability, therefore 0.9 is used to find critical z.

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