n = 8
measurements: 5, 3, 6, 7, 6, 5, 4, 7
Calculate the sample variance, s2, using the
definition formula. (Round your answer to four decimal places.)
s2 =
Calculate the sample variance, s2 using the
computing formula. (Round your answer to four decimal places.)
s2 =
Find the sample standard deviation, s. (Round your
answer to three decimal places.)
s =
3, 7, 8, 5, 6, 4, 9, 10, 7, 8, 6, 5 Using the previous question
's scores, If three points were added to every score in this
distribution, what would be the new mean? If three points were
added to every score in this distribution, what would be the new
standard deviation. Remember, you have already calculated
population standard deviation in a previous problem. This problem
requires two answers.
Lawyer
Nurse
Teacher
Control
8
6
9
8
5
7
6
7
7
6
8
6
7
8
8
7
4
9
7
9
A researcher is interested in whether the likeability of a
crying woman is affected by the viewer’s knowledge of the woman’s
occupation. Twenty participants were shown a video of a woman
crying and were asked to rate her likeability on a scale from 1
(not very likable) to 10 (highly likable). Prior to viewing the
video,...
Use the sample space (5, 6, 7, 8, 9, 10, 11, 12, 13, 14) to find
the probability for a random selected
a) P(integer)
b) P(less than 10 | less than 13)
c) P(greater than 8 | less than 11)
d) P(greater than 7 | greater 12)
Assume that X N(12:6; 5:8). Find the following probabilities
(note: 5.8 is a variance,
not a standard deviation)
a) P(X > 13:1)
b) P(X < 11:2)
c) P(X 12:3) (Hint: The answer is the same as that to P(X <
12:3).)
d) P(X < 7:8)
e) P(X > 9:6)
e) P(X > 9:6)