Question

This is a computational problem that will cover questions 10-15. A history instructor hypothesizes that the...

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

  

Homework Answers

Answer #2

answered by: anonymous
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