This is a computational problem that will cover questions 10-15. A history instructor hypothesizes that the students who earn a C or better spend more time outside of class on the coursework than students who receive a D or an F. She collects the following data (number of hours spent outside of class on the course work) from two samples of students. What does she conclude?
-Do all steps for this problem but DO NOT redo the math provided for you.
C or better D or F
8 4 4 2 1 5 2 2 1 3 |
6 2 1 0 3 2 1 5 |
Data Box Group 1 Sum of x = 32 Sum of x squared = 144 Squared sum of x = 1024 Variance = 4.16 Mean = 3.2 N = 10 |
Data Box Group 2 Sum of x= 20 Sum of x squared = 80 Squared sum of x = 400 Variance = 3.75 Mean = 2.5 N = 8 |
1) What is step 1?
Group of answer choices
a) H0: μ1 ≥ μ2 & H1: μ1 < μ2
b) H0: μ1 ≤ μ2 & H1: μ1 > μ2
c) H0: μ1 = μ2 & H1: μ1 ≠ μ2
2) Set up Step 2
Group of answer choices
a) alpha
[ Choose ] 1 tail .05 18 16 2.120 directional 1.746 non-directional .01
b) tails?
[ Choose ] 1 tail .05 18 16 2.120 directional 1.746 non-directional .01
c) Direction?
[ Choose ] 1 tail .05 18 16 2.120 directional 1.746 non-directional .01
d) df?
[ Choose ] 1 tail .05 18 16 2.120 directional 1.746 non-directional .01
e) Critical value?
[ Choose ] 1 tail .05 18 16 2.120 directional 1.746 non-directional .01
3) What is step 3?
Group of answer choices
a) Estimate of the standard error between the sample means
[ Choose ] 2.999 positive negative 1.746 .701 .999
b) tobt value
[ Choose ] 2.999 positive negative 1.746 .701 .999
c) Positive or negative tobt
[ Choose ] 2.999 positive negative 1.746 .701 .999
4) Is step 4 to Retain H0?
Group of answer choices
a) True
b) False
5) Set up step 5.
Group of answer choices
a) It appears that students who earn C or better spend significantly less time outside of class doing coursework.
b) It appears that students who earn C or better do not spend significantly more time outside of class doing coursework.
c) It appears that students who earn C or better spend significantly more time outside of class doing coursework.
6) When you reject H0 for the type of test on question #10 what do you do after step 5, conclusion?
Group of answer choices
a) Tukey HSD
b) confidence interval and effect size
c) nothing
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