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A radon detector is tested by exposing it to 100 pCi/L of radon. It is known...

A radon detector is tested by exposing it to 100 pCi/L of radon. It is known that the distribution of each reading is normally distributed with s = 7.5 pCi/L. A random sample of 12 radon detectors are tested and their readings are as follows:

105.6

90.9

91.2

96.9

96.5

91.3

100.1

105.0

99.6

107.7

103.3

92.4

Does this sample data suggest the mean radon reading is 100 pCi/L using a significance level of a = 0.05 (use the t-distribution)?

Math   Statistics-And-Probability   
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