SlideShare a Scribd company logo
Top school in India 
By: 
school.edhole.com
Mean, Variance, and Standard Deviation 
for the binomial distribution 
For a binomial distribution, 
n p 
= × 
n p q 
= × × 
n p q 
2 
= × × 
m 
s 
s 
school.edhole.com
Example 
Randomly guessing on a 100 question 
multiple-choice test, where each question 
has 4 possible answers, 
= × = 
4 25 
= × × = 
4 4.3 
3 
4 
100 1 
100 1 
4 18.8 
3 
4 
100 1 
m 
2 
= × × = 
s 
s 
school.edhole.com
Example 
Using our range rule of thumb, 
m - s 
= - × = 
m s 
2 25 2 4.3 16.4 
+ = + × = 
2 25 2 4.3 33.6 
It would be unusual to get less than 17 questions 
correct, or more than 33 question correct if you were 
randomly guessing on the test. 
school.edhole.com
Another Example 
You presume that people are evenly split (50/50) on 
their preference between two candidates. You poll 
80 people, and find 45 prefer candidate A. Is this 
unexpected? 
We could find P(45 or more). 
Alternatively, using our presumed 50/50 preference, 
find mean=40, stddev=4.5. This suggests that 
outcomes of 31 to 49 would be usual occurrences. 
Since 45 falls in that range, we shouldn’t consider 
it unusual. 
school.edhole.com
Another Example 
Now suppose you poll 800 people, and 450 
prefer candidate A. Is this unexpected? 
Using our presumed 50/50 preference, mean = 
400, stddev = 14.1. Again using the range 
rule of thumb, this suggests that outcomes 
of 372 to 428 would be usual. 
Since the outcome of 450 is unusual, we 
should question whether our presumption of 
schoao l5.e0d/5h0o lsep.cliotm is accurate.
Homework 
4.4: 1, 5, 7, 11, 13 
school.edhole.com

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Top school in india

  • 1. Top school in India By: school.edhole.com
  • 2. Mean, Variance, and Standard Deviation for the binomial distribution For a binomial distribution, n p = × n p q = × × n p q 2 = × × m s s school.edhole.com
  • 3. Example Randomly guessing on a 100 question multiple-choice test, where each question has 4 possible answers, = × = 4 25 = × × = 4 4.3 3 4 100 1 100 1 4 18.8 3 4 100 1 m 2 = × × = s s school.edhole.com
  • 4. Example Using our range rule of thumb, m - s = - × = m s 2 25 2 4.3 16.4 + = + × = 2 25 2 4.3 33.6 It would be unusual to get less than 17 questions correct, or more than 33 question correct if you were randomly guessing on the test. school.edhole.com
  • 5. Another Example You presume that people are evenly split (50/50) on their preference between two candidates. You poll 80 people, and find 45 prefer candidate A. Is this unexpected? We could find P(45 or more). Alternatively, using our presumed 50/50 preference, find mean=40, stddev=4.5. This suggests that outcomes of 31 to 49 would be usual occurrences. Since 45 falls in that range, we shouldn’t consider it unusual. school.edhole.com
  • 6. Another Example Now suppose you poll 800 people, and 450 prefer candidate A. Is this unexpected? Using our presumed 50/50 preference, mean = 400, stddev = 14.1. Again using the range rule of thumb, this suggests that outcomes of 372 to 428 would be usual. Since the outcome of 450 is unusual, we should question whether our presumption of schoao l5.e0d/5h0o lsep.cliotm is accurate.
  • 7. Homework 4.4: 1, 5, 7, 11, 13 school.edhole.com