An Observer Is Standing on the Platform of a Railway

question 7

Multiple Choice

An observer is standing on the platform of a railway station.A train goes through the station without stopping.If the frequency of the train whistle decreases by a factor of 1.2 as it approaches and then passes him,calculate the speed of the train (assume the speed of sound in air = 343 m/s) .

• A)112 km/hr
• B)31.2 km/hr
• C)56.0 km/hr
• D)62.0 km/hr
• E)122 km/hr

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Definitions:

Independent Samples

Sets of data collected from distinct, non-overlapping populations.

Parametric Tests

Statistical tests that assume the underlying data distributions fit certain parameters, such as being normally distributed.

Errors In Assumptions

Mistakes or misjudgments made regarding the foundational conditions or premises upon which statistical analyses or models are based.

Nonparametric Techniques

Statistical methods that do not assume a specific distribution for the data and are often used for data that does not meet the assumptions necessary for parametric tests.