From the descriptive results of the presented data, the mean efficiency of the computer aided

design was 83.18%, higher than the mean efficiency of the manual design which was equal to

66.32%. The study further conducted a T-test to investigate whether the difference in the two

means was significant at 5% level of significance. From the T-test analysis results, the t-statistic was

equal to 5.628 with a one tailed probability value of 6.92E-06. Since the probability value was less

than the set level of significance, 5%, the test rejected the null hypothesis that computer aided

design was not efficient than the manual design. A conclusion was therefore made that computer

aided design was more efficient than the manual design leading an easy designing process.