Population standard deviation
A random sample of size 30 from a normal population yields ?x(xbar) = 32.8 with a population standard deviation of 4.51. Construct a 95 percent confidence interval for µ
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A piano tuner use a 440 Hz tunning fork to toune a string that is currently vibrating at 445 Hz. How many beats per second does he hear? What other frequencies could produce the same sound effect?
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