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Bell Ringer
The State Education Department requires local school
districts to keep these records on all students: age, race
or ethnicity, days absent, current grade level,
standardized test scores in
Chapter 2 Review Due Wednesday
Part A: Chapter Review pp. 86-89 #5 (use calculator and sketch results in
your notebook), 7, 8, 9
Part B:
1. A May 2001 Gallup Poll found that
many Americans believe in
Assignment 5
Fall 2017
1. Exercise 4.1.2 on Pages 212213
The weights of 26 professional baseball pitchers are given below, Suppose we assume that
the weight of a professional baseball pitcher is norma
Assignment 4
Fall 2017
1. Exercise 3.1.1 on Page 146:
If the mgf of a random variable X is
1
3
5
+ 23 et , find P( X = 2 or 3).
Answer:
Since the M(t) of X is
1
3
5
+ 23 et , X has a binomial distribu
1. Exercise 1.9.2 on Page 64
Let p( x ) = ( 12 ) x , x = 1, 2, 3, . zero elsewhere, be the p.m.f pf the random variable X. Find
the m.g.f, the mean and the variance of X.
Answer:
E(etX ) =
1
1
etx (
Assignment 6
Fall 2017
1. Exercise 4.5.8 on Page 247
Let us say the life of a tire in miles, say X, is normally distributed with mean and standard
deviation 5000. Past experience indicates that = 30,
Stats 3D03 Practice Set 4
October 30, 2017
1. Exercise 3.1.2 on Page 146
2. Exercise 3.1.16 on Page 148
3. Exercise 3.2.1 on Page 154
4. Exercise 3.2.13 on Page 155
5. Exercise 3.3.24 on Page 166
6. E
Logan Godkin
Statistics
Math 728
Homework 2
4.2.1 Let the observed value of the mean X and of the sample variance of a random sample of size 20 from
a distribution that is N (, 2 ) be 81.2 and 26.5, r
Stats 3D03 - Mid-Term Test 2
November 20, 2017
Instructor: Prof. N. Balakrishnan Total Marks: 15 Duration: 75 mins.
(1) Suppose the joint density function of X and Y is
f(x,y) = C(y x), 0 < a: < y < 1
Problem Set 5
Fall 2017
1. Exercise 4.1.3 on Page 213
Suppose the number of customer X that enter a store between the hours 9:00 a.m. and
10:00 a.m. follows a Poisson distribution with parameter . Sup
Assignment 3
Fall 2017
1. Exercise 2.4.2 on Page 108
Let X and Y have the joint pmf described as follows:
( x, y)
(1,1)
(1,2)
(1,3)
(2,1)
(2,2)
(2,3)
p( x, y)
2
15
4
15
3
15
1
15
1
15
4
15
and p( x, y
Practice Problem 6
Fall 2017
1. Exercise 4.5.4 on Page 246
Let X have a binomial distribution with the number of trials n = 10 and with p either 1/4 or
1/2. The simple hypothesis H0 : p = 1/2 is rejec
Stats 3D03 Practice Set 6
November 26, 2017
1. Exercise 4.5.4 on Page 246
2. Exercise 4.6.6 on Page 253
3. Exercise 4.7.3 on Page 260
4. Exercise 5.3.1 on Page 313
5. Exercise 6.1.1 on Page 326
6. Exe
Problem Set 3
Fall 2017
1. Exercise 2.4.1 on Page 108:
Let the random variables X and Y have the joint p.m.f.
(a) p( x, y) = 31 , ( x, y) = (0, 0), (1, 1), (2, 2), zero elsewhere.
Answer:
1 = E( X ) =