d. x+ 1.282 80.02 % (Round to two decimal places as needed.) e. x+0.99 67 78 % (Round to two decimal places as needed.)

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Please explain the process to get parts D and E. I asked this before and I just got the answer with no explanation as to the process.
What is the confidence level of each of the following confidence intervals for u? Complete parts a through e.
Click the icon to view the table of normal curve areas.
95 % (Round to two decimal places as needed.)
b. x± 1.645
90 % (Round to two decimal places as needed.)
C. X±2.575
99 % (Round to two decimal places as needed.)
d. x+ 1.282
Vn
80.02 % (Round to two decimal places as needed.)
e. x+0.99
67.78 % (Round to two decimal places as needed.)
Transcribed Image Text:What is the confidence level of each of the following confidence intervals for u? Complete parts a through e. Click the icon to view the table of normal curve areas. 95 % (Round to two decimal places as needed.) b. x± 1.645 90 % (Round to two decimal places as needed.) C. X±2.575 99 % (Round to two decimal places as needed.) d. x+ 1.282 Vn 80.02 % (Round to two decimal places as needed.) e. x+0.99 67.78 % (Round to two decimal places as needed.)
Expert Solution
Step 1

In part (d) the critical value is given as 1.282. The right tail area from the standard normal table will be

Statistics homework question answer, step 1, image 1

This implies, 

Statistics homework question answer, step 1, image 2

 

Thus, confidence level is 80.02% 

 

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