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)0.04b)0.90 c)3.52 d)3.93
Accepted Solution
A:
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
Answer:
b. 0.90