EXST 2201 EXAM QUESTIONS AND VERIFIED ANSWERS WITH
COMPLETE SOLUTIONS
Appropriately classify the following situation. Sample 1: birthweight of 19 newborn females
Sample 2: birthweight of 19 newborn males A) Independent B) Dependent
A - Independent
How many columns of data does the ANOVA method analyze?
3 or more
If the population variance is known, do you use a Z test or a T test?
A Z test
What does ANOVA stand for?
Analysis of variance
What is ANOVA used for?
To test the equality of three or more population means
A study was conducted to determine if the salaries of elementary school teachers from two
neighboring districts were equal. A sample of 15 teachers from each district was randomly selected.
Test the claim that the salaries from both districts are equal. Use significance 0.05 and assume that the
data are distributed normally. n x¯ s District 1: 15 $28,900 $2,300 District 2: 15 $30,300 $2,100
What is the appropriate set of hypotheses (H0, H1)?
A - µ1 - µ2 = 0, µ1 - µ2 ≠ 0
, B - µ1 - µ2 ≠ 0, µ1 - µ2 = 0
C - µ1 - µ2 = 0, µ1 - µ2 < 0
D - µ1 - µ2 = 0, µ1 - µ2 > 0
A - µ1 - µ2 = 0, µ1 - µ2 ≠ 0
For the following set of 5 data points for two variables, what is the correct correlation coefficient?
Zx - -1.3, -0.4, 0.5, -0.1, 1.4
Zy - 1.4, 0.3, -0.3, -0.1, -1.3
A) -0.780
B) -0.918
C) 0.859
D) -0.975
D) -0.975
Hint: add together zx and zy and divide by degrees of freedom (4)
If Y hat = 2.10 - 0.21x and x = -3 and y = -6, what is the residual?
-8.73
Plug in the equation and get the answer 2.73 then subtract that from -6
1. Classify the following scenarios. 1A. Sample 1: The weights (lbs) of 19 newborn females. Sample 2:
The weights (lbs) of 19 newborn males
COMPLETE SOLUTIONS
Appropriately classify the following situation. Sample 1: birthweight of 19 newborn females
Sample 2: birthweight of 19 newborn males A) Independent B) Dependent
A - Independent
How many columns of data does the ANOVA method analyze?
3 or more
If the population variance is known, do you use a Z test or a T test?
A Z test
What does ANOVA stand for?
Analysis of variance
What is ANOVA used for?
To test the equality of three or more population means
A study was conducted to determine if the salaries of elementary school teachers from two
neighboring districts were equal. A sample of 15 teachers from each district was randomly selected.
Test the claim that the salaries from both districts are equal. Use significance 0.05 and assume that the
data are distributed normally. n x¯ s District 1: 15 $28,900 $2,300 District 2: 15 $30,300 $2,100
What is the appropriate set of hypotheses (H0, H1)?
A - µ1 - µ2 = 0, µ1 - µ2 ≠ 0
, B - µ1 - µ2 ≠ 0, µ1 - µ2 = 0
C - µ1 - µ2 = 0, µ1 - µ2 < 0
D - µ1 - µ2 = 0, µ1 - µ2 > 0
A - µ1 - µ2 = 0, µ1 - µ2 ≠ 0
For the following set of 5 data points for two variables, what is the correct correlation coefficient?
Zx - -1.3, -0.4, 0.5, -0.1, 1.4
Zy - 1.4, 0.3, -0.3, -0.1, -1.3
A) -0.780
B) -0.918
C) 0.859
D) -0.975
D) -0.975
Hint: add together zx and zy and divide by degrees of freedom (4)
If Y hat = 2.10 - 0.21x and x = -3 and y = -6, what is the residual?
-8.73
Plug in the equation and get the answer 2.73 then subtract that from -6
1. Classify the following scenarios. 1A. Sample 1: The weights (lbs) of 19 newborn females. Sample 2:
The weights (lbs) of 19 newborn males
