Three dosage levels of a drug to improve alertness were administered to 18 subjects. An Analysis of Variance was carried out, giving the
following table. (This is output from the Data Analysis Toolpak in Excel)
Our conclusion at α = 0.01 should be:
The average alertness level is the same for all three dosages
The average alertness level is not the same for all three dosages
No conclusion can be made from this experiment
Question 2
1
Point
The ANOVA F-test is a more general version of
One sample t-test
Two sample t-test
Paired t-test
Chi sqare goodness of fit test
Question 3
1
Point
If the variability within samples is small compared to the variability between samples, it is evidence against the population means being equal.
True
False
Question 4
1
Point
From the ANOVA F-test we may identify which population means are different.
True
False
Question 5
1
Point
In an ANOVA, the square root of the following expression serves as an estimate for the variance σ2 which is common to all the "l" populations:
MS(Between)
MS(Within)
MS(Total)
MS(Residual)
Question 6
1
Point
A given study resulted in an ANOVA table with df(within)= 55 and df(between) = 5. The overall sample size was:
56
59
60
61
66
Question 7
1
Point
A study finds that maximal oxygen consumption (VO2 max) tends to decrease with age. The best choice to describe this relationship is:
Exact negative linear relationship
Negative linear relationship
No linear relationship
Positive linear relationship
Exact positive linear relationship
Question 8
1
Point
In a regression model, if the intercept coefficient is zero, than there is no relationship between the response variable and the explanatory variable.
True
False
Question 9
1
Point
If the slope in a regression is positive, the response variable decreases as the explanatory variable increases
True
False
Question 10
1
Point
The estimate for the slope depends only on the observed values for Y, not on the observed values for X
True
False
Question 11
1
Point
In a regression of weight (lbs) on height (inches), it was found that b0 = -220 and b1 = 6. If a given individual is 72 inches tall, the regression predicts a weight of:
Add your answer
Integer, decimal, or E notation allowed
Question 12
1
Point
Consider the following output from a regression of height on age of loblolly pine tree (Output from the Data Analysis Toolpak in Excel).
True or False: There is sufficient evidence to reject H0: β1= 0 in favor of Ha: β1 not equal to 0
True
False
Question 13
1
Point
A 95% confidence interval is desired for a data set with:
b1 = -0.07
Sx = 68.6
Sy = 6.03
Se = 3.86
n = 32
Which interval is the closest match to the given data?
[0.0494, 0.0906]
[-7.9532, 7.8132]
[-2.2818, 2.1418]
[-0.0906, -0.0494]
Question 14
1
Point
Consider again the data set with:
b1 = -0.07
Sx = 68.6
Sy = 6.03
Se = 3.86
n = 32
The value of the correlation coefficient is closest to:
-0.9
-0.8
-0.2
0.4
0.7
