Answer:
To test,
# Excel Output:
t-Test: Two-Sample Assuming Unequal Variances | ||
Manufacturer1 | Manfacturer2 | |
Mean | 909.65 | 1018.35 |
Variance | 8893.464103 | 9389.874359 |
Observations | 40 | 40 |
Hypothesized Mean Difference | 0 | |
df | 78 | |
t Stat | -5.084307282 | |
P(T<=t) one-tail | 1.23639E-06 | |
t Critical one-tail | 1.664624645 | |
P(T<=t) two-tail | 2.47277E-06 | |
t Critical two-tail | 1.990847069 |
Q.13)
Test statistic= -5.084
Q.14)
P value=2.47277.10-6
Q.15)
Where p value < 0.05 ( Alpha level)
We reject Ho
Conclusion: There is difference in life expectancy of bulbs between the two companies.
Scenario 3 A comparison was made between the 100 watt light bulbs manufactured by Manufacturer 1...