Nitrogen dioxide (NO2) is toxic by inhalation. A scientist claims that the population mean nitrogen dioxide...
Nitrogen dioxide (NO2) is toxic by inhalation. A scientist claims that the population mean nitrogen dioxide level in West London is higher than 30 parts per billion and collects the NO2 levels for 36 randomly selected days. The results show an average of 32.86 and the standard deviation of 12.72 parts per billion. Historical data show that the nitrogen dioxide levels follow a normal distribution with a standard deviation of 12 parts per billion.
(a) (3 pts) Construct a 95% confidence interval for the population mean nitrogen dioxide level in West London.
(b) (7 pts) Test if there is significant evidence for the scientist’s claim given the level of significance 5%. Show all steps of a hypothesis testing.
(c) (2 pts) Can you use the result in part (a) for the test in part (b)? Justify your answer.v
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Nitrogen dioxide (NO2) is toxic by inhalation. A scientist
claims that the population mean nitrogen dioxide...
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