The population mean of the heights of five-year old boys is 100cm. A teacher measures the height of her twenty t students, obtaining a mean height of 105cm and standard deviation 18. With a 5% significance level to calculate whether the true mean is actually greater than 100cm. What is the test statistic and p-value O z-1.39. p-0.824 Ot-1.39. p-value-0.0888 O te-1.39. p-value-0.0888 O 2e-1.39. p-0.824

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