Destiny performs a hypothesis test on a population with mu is equal to 115 and sigma is equal to 30 Her sample size is 25 with a mean of 120 point 4 Which of the following correctly depicts the z -statistic for this data?

Use the z-statistic formula: z = (sample mean − population mean) ÷ (population standard deviation ÷ √sample size). Here, z = (120.4 − 115) ÷ (30 ÷ √25) = 5.4 ÷ 6 = 0.90. Therefore, the correct choice is 0.90.

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