Question

Generally, the average typing speed is 56 words per minute (wp). A professor wanted to see where his students stand compared to the population. He tested 24 of his students and obtained the following estimates: an average typing speed of 58 with a variance of 361.00. What can the professor conclude with α = 0.01?

a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test Related-Samples t-test
Also state population and sample from choices below
Population:
---Select--- student typing speed the professor the students average typing speed typing speed
Sample:
---Select--- student typing speed the professor the students average typing speed typing speed

b) Compute the appropriate test statistic(s) 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

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

D Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
Find d =  ;   ---Select--- na trivial effect small effect medium effect large effect
Find r² =  ;   ---Select--- na trivial effect small effect medium effect large effect

Make an interpretation based on the results.

A. Student typing speed is significantly higher than average.

B . Student typing speed is significantly lower than average.    

C.Student typing speed did not significantly differ from the average.

Answer 1

2-tailed t-test
mean	58
sd	19
n	24
alpha	0.01
mu	56
a)	one sample t-test
population	average typing speed
sample	typing speed of students
b)
critical	2.8073
TS	0.5157
decision	fail to reject
c)
lower	-8.8879
upper	12.8879
d)
d	0.1053	trivial
r^2	0.0114	small
interpretation	option C)

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