This preview shows pages 1–3. Sign up to view the full content.
WEBDISTANCE
ST 370
Quiz 1
FALL 2007
ver.
B
NAME_______________________________________
ID # _________________________________________
I will neither give nor receive help from other students during
this quiz
Sign ___________________________________________
PROBLEM 1:
If
the number 3
is added to every member of a sample of observations
(as might happen if an ohm meter was not zeroed before doing measurements) THEN
a)
the sample standard deviation of the sample does not change
b)
the sample variance is increased by 9 times
c)
the sample variance is increased by 3 times
d)
the sample mean does not change
e)
the sample median does not change
PROBLEMS 2 and 3:
A sample of 5 cars parked along the
Hillsborough Street across
from the library revealed the following data on the NUMBER OF M&M’s on the floor
under the passengerside seat
33,
7,
3,
54,
12
2)
The value of the
(Sample Mean
MINUS
the
Sample median)
for
this dataset
is :
a)
5.2
b)
9.8
c)
18.5
d)
12.3
e) none of these
3)
What is the
37
th
percentile for this dataset
a)
9.6
b)
8.4
c)
8.1
d)
7.4
e) none of these
4)
How is the correlation coefficient r related to the least squares slope b
a)
r = b s
X
/ s
Y
b)
r = s
X
/( b s
Y
)
c)
r = b s
Y
/ s
X
d)
r = s
Y
/ (b s
X
)
e)
none of these
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document Problem 5
: The following lm output on response of time from 0 to 60 mph for different
tire pressure and weight in trunk of car indicate which terms are statistically significant
a)
intercept,
weight,
pressure
b)
only intercept and weight
c)
only weight* pressure
d)
no terms are significant
e)
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 01/16/2012 for the course ST 370 taught by Professor Nail during the Fall '08 term at N.C. State.
 Fall '08
 Nail

Click to edit the document details