Singapore aims to be one of the world's most livable countries. In our urban living, noise pollution from transportation imposes a challenge to this goal. Sound is measured in frequency by Hertz (Hz) and loudness by Decibel (dB). A person with perfect hearing can sense low frequency sound at 20 Hz from a rumbling drum, to high frequency at 20 kHz sharper than mosquito buzzing. Sound loudness levels can be soft like leaves rustling at 20 dB, or loud like rock concert at 120dB. Our abilities to hear high frequency and detect sound volume will deteriorate as we age. Furthermore, constant exposure to noise beyond 90 dB will cause gradual damage to our hearing organ. Noise pollution not only affect our hearing, but will also affect our emotions. Assuming Efficient Bus Service (EBS) was contracted by Land Transport Authority (LTA) since eight years ago to operate bus services in the country. As a good corporate citizen, EBS's senior management feels it has the responsibility to reduce noise caused by its vehicles. 1) Develop an appropriate Hypothesis Test at 0.05 significance level to validate Leise's claim. You may adopt either critical or p value approach with the help of outputs from Excel Data Analysis tool. However, you are required to show all the test steps. Explain the type of Hypothesis Test Error that may occur in your test conclusion, the consequence of this error, and how the occurrence of this error can be reduced