Question la 1b 1c 1d 2a 2b 20 Evaluation Scheme Exceeds expectation (4- Meets Expectation (34) 5) Data converted to class interval as specified, correct frequency noted, and bar chart made accordingly. All three measures of central tendency calculated correctly with stepwise calculation. All four measures of dispersion calculated correctly with stepwise calculation. Shape of the distribution correctly specified and explained the link with the measures of central tendency Mean and standard deviation calculated correctly with stepwise calculation. Includes: i. correctly framed null and alternate Data converted to class interval as specified, correct frequency noted and but incorrect bar chart. All three measures of central tendency calculated correctly but stepwise calculation is missing. All four measures of dispersion calculated correctly but stepwise calculation is missing. Shape of the distribution correctly specified but did not explain the link with the measures of central tendency Mean and standard deviation calculated correctly but stepwise calculation is missing. Includes at least three out of five points mentioned below, specified correctly: correctly framed Does not meet expectation (below 3) Neither data converted to class interval as specified nor correct frequency noted nor incorrect bar chart. Incorrect measures of central tendency or incorrect calculation steps. Incorrect measures of dispersion or incorrect calculation steps. Shape of the distribution incorrectly specified. Mean and standard deviation calculated incorrectly. Includes less than three out of five points mentioned below, specified correctly: correctly framed null and alternate hypothesis, hypothesis, i. i. ii. identified degrees null and alternate of freedom, hypothesis, iii. t-statistic calculated ii. identified degrees ii. identified degrees of correctly, of freedom, freedom, iv. right critical t-value iii. t-statistic calculated iii. t-statistic calculated identified from the correctly, correctly, table, and iv. right critical t-value iv. right critical t-value V. right interpretation regarding rejection/ identified from the table, and non-rejection of V. null hypothesis. right interpretation regarding rejection/ non- identified from the table, and right interpretation regarding rejection/non- or incorrect specification of all five points mentioned above.