STATISTICS MODULE 5 BOTH
QUIZZES WITH CORRECT ANSWERS
The relationship between hours of exercise per week and GPA
has a parabolic shape. That is, increasing exercise first
increases GPA, but then, at a certain point, GPA tends to
decrease. The variability is roughly the same for all levels of
exercise, and responses are independent. Would regression be
appropriate? - CORRECT ANSWER-no, because the
relationship is not linear
Which of the following is not true? - CORRECT ANSWER-
Confidence intervals are most narrow when x^∗ is on the
extremes.
Which of the following is not a condition for ANOVA to produce
valid results? - CORRECT ANSWER-There must be an SRS
from each of the populations.
All SRSs are the same size.
For an SRS of college students, eye color and height were
determined. Should regression inference be used to draw
conclusions about the relationship between eye color and
height for this data set? - CORRECT ANSWER-no, because
the responses are not independent
no, because the slope and the intercept are unknown
no, because it is not a designed experiment
yes, if mean height has a straight-line relationship to height
, Linear regression of selling price on house size was carried out
using data for a sample of recent sales. For a house of size
1500 square feet, the 95% prediction interval for its selling price
is _______ the 95% confidence interval for the average selling
price of all homes that are 1500 square feet. - CORRECT
ANSWER-wider than
For which of the following pairs of variables would a two-way
table of counts be a useful data analysis tool? - CORRECT
ANSWER-party affiliation and opinion on presidential
performance
Edwin Hubble collected data on the relationship between the
distance a galaxy is from Earth and the velocity with which it is
receding. He assumed µy = α + βx, where x is the distance
from Earth (in megaparsecs) and µy is the mean velocity (in
kilometers per second) for all galaxies at that distance. What
does β represent? - CORRECT ANSWER-the change in mean
velocity for a one-megaparsec increase in distance for all
galaxies in the universe
For a χ^2 goodness of fit test with five categories, there are
_______ degrees of freedom. - CORRECT ANSWER-4
There are _______ residuals. - CORRECT ANSWER-
Edwin Hubble collected data on the relationship between the
distance a galaxy is from Earth and the velocity with which it is
receding. A 95% confidence interval for β is (298.12, 610.20).
What is the correct interpretation of this confidence interval? -
CORRECT ANSWER-With 95% confidence, the change in
average recession velocity per unit distance from Earth is
between 298.12 and 610.20 km/sec/megaparsec.
- CORRECT ANSWER-
QUIZZES WITH CORRECT ANSWERS
The relationship between hours of exercise per week and GPA
has a parabolic shape. That is, increasing exercise first
increases GPA, but then, at a certain point, GPA tends to
decrease. The variability is roughly the same for all levels of
exercise, and responses are independent. Would regression be
appropriate? - CORRECT ANSWER-no, because the
relationship is not linear
Which of the following is not true? - CORRECT ANSWER-
Confidence intervals are most narrow when x^∗ is on the
extremes.
Which of the following is not a condition for ANOVA to produce
valid results? - CORRECT ANSWER-There must be an SRS
from each of the populations.
All SRSs are the same size.
For an SRS of college students, eye color and height were
determined. Should regression inference be used to draw
conclusions about the relationship between eye color and
height for this data set? - CORRECT ANSWER-no, because
the responses are not independent
no, because the slope and the intercept are unknown
no, because it is not a designed experiment
yes, if mean height has a straight-line relationship to height
, Linear regression of selling price on house size was carried out
using data for a sample of recent sales. For a house of size
1500 square feet, the 95% prediction interval for its selling price
is _______ the 95% confidence interval for the average selling
price of all homes that are 1500 square feet. - CORRECT
ANSWER-wider than
For which of the following pairs of variables would a two-way
table of counts be a useful data analysis tool? - CORRECT
ANSWER-party affiliation and opinion on presidential
performance
Edwin Hubble collected data on the relationship between the
distance a galaxy is from Earth and the velocity with which it is
receding. He assumed µy = α + βx, where x is the distance
from Earth (in megaparsecs) and µy is the mean velocity (in
kilometers per second) for all galaxies at that distance. What
does β represent? - CORRECT ANSWER-the change in mean
velocity for a one-megaparsec increase in distance for all
galaxies in the universe
For a χ^2 goodness of fit test with five categories, there are
_______ degrees of freedom. - CORRECT ANSWER-4
There are _______ residuals. - CORRECT ANSWER-
Edwin Hubble collected data on the relationship between the
distance a galaxy is from Earth and the velocity with which it is
receding. A 95% confidence interval for β is (298.12, 610.20).
What is the correct interpretation of this confidence interval? -
CORRECT ANSWER-With 95% confidence, the change in
average recession velocity per unit distance from Earth is
between 298.12 and 610.20 km/sec/megaparsec.
- CORRECT ANSWER-
