The diameter of a ring is known to have a normal distribution with standard deviation of 0.05 inch. A random sample of 20 rings have an average diameter of 2.1015 inch. What is the 95% two-sided confidence interval for the population mean diameter of rings. a) b) c) (1.0781, 2.1249) (2.0781, 2.1249) (-2.0781, –2.1249) Cannot determine with the given information.

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The diameter of a ring is known to have a normal distribution with standard deviation of
0.05 inch. A random sample of 20 rings have an average diameter of 2.1015 inch. What is
the 95% two-sided confidence interval for the population mean diameter of rings.
(1.0781, 2.1249)
(2.0781, 2.1249)
(-2.0781, -2.1249)
Cannot detemine with the
d)
given
information.
Answer
Transcribed Image Text:The diameter of a ring is known to have a normal distribution with standard deviation of 0.05 inch. A random sample of 20 rings have an average diameter of 2.1015 inch. What is the 95% two-sided confidence interval for the population mean diameter of rings. (1.0781, 2.1249) (2.0781, 2.1249) (-2.0781, -2.1249) Cannot detemine with the d) given information. Answer
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