What does it mean for a z-score for a sample mean, or a test statistic, to be statistically significant?

What z-score value separates the top 10% of a normal distribution from the bottom 90%?

Which of the following is an accurate definition for the power of a statistical test?

The complement of the null hypothesis is the _______.

For a normal population with µ = 40 and σ = 10 which of the following samples has the highest probability of being obtained?

A teacher wants to know whether the children in her class are performing significantly better on a standardized math test compared to the national average. The national mean score is μ = 85, the national standard deviation is σ = 25, and the mean score in her class (n = 25) is M = 92.5. Use α = .05. What is the z-score for this sample mean?

When is there a risk of a Type II error?

Which of the following is an accurate definition for the power of a statistical test?

Students in Dr. Gallimore’s class took an exam: the mean was an 85 with a standard deviation of 2. What was the proportion of students who received an exam score between 88 and 92?

For a normal population with µ = 40 and σ = 10 which of the following samples has the highest probability of being obtained?