Questions from Essentials of Statistics

Q: Suppose that a professor randomly assigns students to study groups of n

Suppose that a professor randomly assigns students to study groups of n = 4 students. The final exam in the professor’s class has a mean of μ = 75 and a standard deviation of σ = 10. What is the expec...

Q: Does a hypothesis test allow a researcher to claim that an alternative

Does a hypothesis test allow a researcher to claim that an alternative hypothesis is true? Explain your answer.

Q: Suppose that a treatment effect increases both the mean and the standard

Suppose that a treatment effect increases both the mean and the standard deviation of a measurement. Can a hypothesis test with z be conducted? Explain your answer.

Q: Identify the four steps of a hypothesis test as presented in this

Identify the four steps of a hypothesis test as presented in this chapter.

Q: Explain how the power of a hypothesis test is influenced by each

Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other factors are held constant. a. Increasing the alpha level from .01 to .05. b. Changing from a on...

Q: Suppose that a researcher is interested in the effect of a new

Suppose that a researcher is interested in the effect of a new college preparation course on scores for a standardized critical thinking test with a population mean of μ = 20. Students receive trainin...

Q: Define the alpha level and the critical region for a hypothesis test

Define the alpha level and the critical region for a hypothesis test.

Q: If the alpha level is changed from α = .05 to

If the alpha level is changed from α = .05 to α = .01: a. What happens to the boundaries for the critical region? b. What happens to the probability of a Type I error?

Q: The international affective picture system is a collection of images that differ

The international affective picture system is a collection of images that differ in their emotional content. The system contains some images that evoke fear in participants (e.g., a photograph of a sp...

Q: Explain how each of the following influences the value of the z

Explain how each of the following influences the value of the z-score in a hypothesis test. a. Increasing the size of the treatment effect. b. Increasing the population standard deviation. c. Increasi...