Question

Noise pollution has an adverse impact of highway infrastructure systems. From past records, the average noise level at neighborhoods located near Highways is 80 decibels with a standard deviation of 7 decibels. As part of a highway noise reduction study, 25 sets of noise data samples were collected from randomly selected Highways across the entire country.

(1) Find the upper limit of the confidence interval such that there is a 96.5% probability of any sample mean falling between 77.10 and that upper limit.

(2) In our bid to in order to investigate noise pollution attributes of this highway engineering system, why would it be impractical to collect noise data from all spots around all Highways across the country?

Answer 1

円, 牙 (2-108 58) (プー77, 10

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