Question

Assume that all grade-point averages are to be standardized on a scale between 0 and 6. How many grade-point averages must be obtained so that the sample mean is within range 6-0 0.012 of the population mean? Assume that a 98% confidence level is desired. If using the range rule of thumb, o can be estimated as = 1.5. Does the sample size 4 4 seem practical? The required sample size is (Round up to the nearest whole number as needed.)

Answer 1

(Page No SA Date Averong point ot 142+ 3+ 4+ 5+ 6 7 21 - 2 7 3 on standardised (x-4)2 2 = xou 62 6 (0-3)² + (1-3)? (2-3)² (33) ²4-3) (53) 2 (-3)2+(-2) 24 (-11² (0) 2 (1 124 (27² +(3) 2 7 g+ 4+ 1 tot 1+479 7 6 = 4 kehon x=0 0-3 4 =-6.75 X=1 2= 1-3 o 5 X = 2 z 2-3 Samplo size 6 27 (17) - 0.25 4 - 21-212 2 3-3 21.12 - 1-0.gs. X=4 4-3 -0.02 0-25 X = 5 5-3 n 4 x = 6 -0.75 (0-02)? 3(1-3) o 98 -0.0024 Sample size 0.0024 4.