Question

Dr. Smith believes that a novel anxiety drug is detrimental to cognition. To examine this, the drug is administered to a random sample of 24 trained rats. The rats were then placed in a maze and timed on how long it took them to complete it. The average completion time was 44 seconds. Normal rats have a mean completion time of 45 seconds with a standard deviation of 14 seconds. What can be concluded with α = 0.05?

a) What is the appropriate test statistic?
---Select--- na z-test one-sample t-test independent-samples t-test related-samples t-test

b)
Population:
---Select--- time to complete maze cognition trained rats normal rats the maze
Sample:
---Select--- time to complete maze cognition trained rats normal rats the maze

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--- Reject H0 Fail to 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 select "na" below.
d =  ;   ---Select--- na trivial effect small effect medium effect large effect
r² =  ;   ---Select--- na trivial effect small effect medium effect large effect

f) Make an interpretation based on the results.

Rats on the anxiety drug were significantly slower in completing the maze.Rats on the anxiety drug were significantly quicker in completing the maze.     The anxiety drug did not significantly impact the rats in completing the maze.

Answer 1