Destiny performs a hypothesis test on a population with µ = 115 and σ = 30. her sample size is 25 with a mean of 120.4. which of the following correctly depicts the z-statistic for this data? a)0.04 b)0.90 c)3.52 d)3.93

z statistic or z score can be calculated using the following formula:

z = (x – u) / (σ / sqrt n)

So simply substitute the given values:

z = (120.4 – 115) / (30 / sqrt 25)

z = 0.90

b. 0.90

The answer choice which correctly depicts the z-statistic for this data is:

This refers to the statistical approach where there is the test of an assumption regarding a population parameter.

The formular for z-statistic is

Therefore, we input the values and we get

z = (120.4 – 115) / (30 / sqrt 25)

We calculate further and we get

z = 0.90

Therefore, the correct answer is option B

REad more about hypothesis test here:
link

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation:

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step-by-step explanation: