Question

Dr. Hofstadter believes she has inferior teaching skills. To investigate, her class takes a chemistry quiz. The population average for the chemistry quiz is 15. What can be concluded with an α of 0.05? The quiz scores for a random sample from the class are:
16, 19, 18, 18, 19, 15, 18.

a) What is the appropriate test statistic?
---Select---

Options are: na, z-test, One-Sample t-test, Independent-Samples t-test, or Related-Samples t-test

b)
Population:
---Select---

-Options are: the class, chemistry, Dr. Hofstadter, population, or teaching skills

Sample:
---Select---

-Options are: the class, chemistry, Dr. Hofstadter, population, or teaching skills

c) Obtain/compute the appropriate values to make a decision about H₀.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
critical value =_____ ; test statistic = _____

Decision:  ---Select---

Options are: Reject H0 Fail or reject H0

d) If appropriate, compute the CI. If not appropriate, input "na" for both spaces below.
[___ , ___ ]

e) Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.

d =  ;   ---Select---

Options are: na, trivial effect, small effect, medium effect, large effect

r² =  ;   ---Select---

Options are: na, trivial effect, small effect, medium effect, large effect

f) Make an interpretation based on the results. Which one is correct?

a)Quiz scores for the class were significantly higher than the population.

b)Quiz scores for the class were significantly lower than the population.    

c)Quiz scores from the class are not significantly different than the population.

Answer 1