MATH 1342 Name ___________________________ Elementary Statistical Methods Lab 3 – Ch.

MATH 1342Name ___________________________Elementary Statistical MethodsLab 3 – Ch.7 – Normal DistributionCritical Thinking; Communication Skills; Empirical/Quantitative SkillsGrading using “The Curve”When grading using “the curve”, the percentages are as follows:A:Top 10% of scoresB:Scores between P70and P90C:Middle 40% (scores between P30and P70)D:Scores between P10and P30F:Bottom 10% of scores20%40%20%10%10%P10P30P70P90CLASS #1:Suppose that the exam grades forClass #1are as follows_354446474851545555575758596060606061626468697072737575778285= 61.3= 11.5a)Using the mean and standard deviation above and the invNorm feature of your calculator,determine “the curve” cutoffs. Round these test grade cutoffs to one decimal.Label them underneath the curve.Test Grades Lab Ch.7 continuedb)Use the picture you created in part (a) to fill in the chart below with therange of scores foreach letter grade under this plan. Then, look at the 30 test grades and count how many test gradeswould fall in each letter grade based on thescale.Letter GradeRange of ScoresNumber of TestsA_______ to 100BCDF0 to __________CLASS #2:Suppose that the exam grades forClass #2are as follows_55646667687174757577777879808080808182848889909293959597100100= 81.1= 11.1c)Using the mean and standard deviation above and the invNorm feature of your calculator,determine “the curve” cutoffs. Round these test grade cutoffs to one decimal.Label them underneath the curve.Test Grades Lab Ch.7 continuedd)Use the picture you created in part (c) to fill in the chart below with therange of scores foreach letter grade under this plan. Then, look at the 30 test grades and count how many test gradeswould fall in each letter grade based on thescale.Letter GradeRange of ScoresNumber of TestsA_______ to 100BCDF0 to __________Final Question:Write a paragraph explaining whether or not you think “Grading using the Curve” is fair and WHY.Consider how the grades were affected in BOTH classes. Give a statistical argument, don’t just giveyour “feelings”. Use complete sentences and proper grammar. Write in the space provided or typeand attach.

MATH 1342Elementary Statistical MethodsLab 3 –Ch.7 – Normal Distribution Name ___________________________ Critical Thinking; Communication Skills; Empirical/Quantitative Skills Grading using…