In an environmental impact study for a new airport, the noise level of various jets was measured just seconds after their wheels left the ground. The jets were either wide-bodied or narrow-bodied. The noise levels in decibels (dB) are recorded for 15 wide-bodied jets and 12 narrow-bodied jets. 'WideBodied' 'NarrowBodied' 109.5 131.4 107.3 126.8 105 114.1 117.3 126.9 105.4 108.2 113.7 122 121.7 106.9 109.2 116.3 108.1 115.5 106.4 111.6 104.6 124.5 110.5 116.2 110.9   111   112.4   a) Do the two types of jets have different mean noise levels? b) What is the name of the test used to test the hypothesis, and what assumptions are required? Test them c) Write the null and alternate hypotheses

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.