A new starch polymer foam with high shock absorbent properties is expected to perform better than the old foam which can withstand a maximum impact of 1.56 Joule (J). A simple destructive test to quantify shock absorption ability of the new foam is conducted. Table 5 shows the impact energy absorbed (in J) that the new foam can withstand for each test. Table 5 1.61 1.5 1.65 1.7 1.4 1.59 1.65 1.5
1)
A new starch polymer foam with high shock absorbent properties is expected to perform better than
the old foam which can withstand a maximum impact of 1.56 Joule (J). A simple destructive test
to quantify shock absorption ability of the new foam is conducted. Table 5 shows the impact energy
absorbed (in J) that the new foam can withstand for each test.
Table 5
1.61 1.5 1.65 1.7 1.4 1.59 1.65 1.5
Does the recorded data suggests that the new foam performs better than the old foam? Use 2.5%
level of significance.
2)
A number of 28 university students who smokes completed a questionnaire inquiring their smoking
history and behavior. The result shows that the average smoking initiation age of this group is 21.6
years with a variance of 18.49. Based on past record, the smoking initiation age of university
student has a mean of 20.74 years with a standard deviation of 5.1 years. Conduct a necessary
analysis to determine if the smoking initiation age remain the same as the previous record. Use 4%
level of significance.
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