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# SamEx2 - Sample Exam II STA 2023 Name INSTRUCTIONS 1 Fill...

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STA 2023 Sample Exam II Name: INSTRUCTIONS 1. Fill in all the spaces above with the required information. 2. Make sure your exam includes 7 problems, a formula sheet, a z-table and a binomial table. The student is responsible for making sure the exam is nondefective. 3. This exam is worth a total of 100 points. The point value of each question is indicated in parentheses. 4. For questions that are true/false, circle the appropriate response. For questions that are to be worked out, show your work in the space provided . Full credit can only be given when you show your work. 5. If a table attached to the exam can be used to find an answer to any question, you must use the table correctly to receive full credit. 6. If a problem says SET UP , you don’t need to implement the arithmetic necessary to reach the final numerical answer. You should work the problem completely up to the point of doing the arithmetic. Put all numbers into the appropriate formula(s), leaving no symbols or letters. 7. Do not spend too much time on any part of the exam. Skip questions that cause you trouble and return to them later. 8. When turning in the exam, show your picture i.d. FORMULAS μ = E ( x ) = xp ( x ) σ 2 = E ( X - μ ) 2 = ( x - μ ) 2 p ( x ) = E ( x 2 ) - μ 2 = x 2 p ( x ) - μ 2 For a binomial random variable: μ = np σ 2 = npq p ( x ) = n x p x q n - x where n x = n !

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