King Fahd University of Petroleum & Minerals
Department of Mathematics & Statistics
STAT-211-Term091-I
Quiz #2
ID:
Serial:
Name:
Question One (3 Points):
The data below show the
2006 Winter Olympics.
gold
gold
bronze
gold
gold
silver
gold
gold
Section:
ty
King Fahd University of Petroleum & Minerals
Department of Mathematics & Statistics
STAT-211-Term101-II
Quiz #2
ID:
Serial:
Name:
Section
Question One (3 Points):
For the following table, construct an ogive.
Interval
0 to 5
5 to 10
10 to 15
15 to 20
20 to
KING FAHD UNIVERSITY OF PETROLEUM & MINERALS
DEPARTMENT OF MATHEMATICS & STATISTICS
DHAHRAN, SAUDI ARABIA
STAT211: BUSINESS STATISTICS I (102)
Course Objectives:
Introduce basic concepts of probability and statistics to business students. Emphasize the un
1
The cumulative Standard Normal distribution
Entry represented area under the cumulative standardized normal
distribution from - to Z
Cumulative Probabilities
Z
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
3.0
2.9
0.0013
0.0013
0.0013
0.0012
0.001
STAT 211 Business Statistics I Term 102
1
Question One (3+3+3=9 points)
The time in minutes that forty workers needed to assemble computers were registered. The
following frequency distribution was obtained.
Class limits
20 - 25
25 30
30 35
35 40
40 45
45
Home Work Questions (Chapter Two)
Q1: Fill in the missing components of the following frequency distribution constructed for a
sample size of 50:
Class
Frequency
7.85 less than
less than 8.05
8.05 less than
less than 8.25
8.25 less than
Relative
frequency
Home Work Questions (Chapter Three)
Note: You are allowed to use only a calculator in this homework
Q1 Below is the five-number summary of salaries (in $) for a sample of U.S. marketing
managers.
Min
Q1
Median
Q3
Max
46360 69693 77020 91750 129420
1. Woul
Home Work Questions (Chapter Three)
Note: You are allowed to use only a calculator in this homework
Q1 Below is the five-number summary of salaries (in $) for a sample of U.S. marketing
managers.
Min
Q1
Median
Q3
Max
46360 69693 77020 91750 129420
1. Woul
Home Work Questions (Chapter One)
Q1:
Define each of the following statistical terms:
a. Descriptive statistics
b. Statistical inference
c. Population
d. Sample
Solution:
a. Descriptive statistics deals with methods of organizing, summarizing, and
present
Home Work Questions (Chapter Four)
Q1 A cafeteria offers a three course meal. One chooses a main course, a starch, and a dessert. The
possible choices are below:
Meal
Main course
Starch course
Dessert
Choices
Chicken or roast beef
Pasta or rice or potatoe
Homework Chapter 7
1. A manufacturer claims that the average life of its light bulb is 1,200 hours. Assume that the
life of all such bulbs has a normal distribution with mean 1,200 hours, and standard deviation
70 hours. Determine the probability the mean
Homework Chapter 7
1. A manufacturer claims that the average life of its light bulb is 1,200 hours. Assume that the
life of all such bulbs has a normal distribution with mean 1,200 hours, and standard deviation
70 hours. Determine the probability the mean
Homework Chapter 6
1. Assuming that the change in daily closing prices for stocks on the New York
Stock Exchange is a random variable that is normally distributed with a mean of
$0.35 and a standard deviation of $0.33. Based on this information, what is t
Q1. Consider the following out come for experiment:
Outcome (x)
Probability p(x)
1
0.2
2
0.25
3
0.15
4
0.10
5
0.30
a. Let event A consist of the outcomes 2, 4, and 5 and event B consist of out
come 4 and 5. Find the probability the either A or B occurs
b.
Homework Chapter 8
1. A sample of 16 observations selected from a normal distribution yields a sample
mean and variance 33 and 49 respectively. Construct a confidence interval for the
population mean for each of the following confidence levels.
b) 99%.
c)
Q1. Consider the following out come for experiment:
Outcome (x)
Probability p(x)
1
0.2
2
0.25
3
0.15
4
0.10
5
0.30
a. Let event A consist of the outcomes 2, 4, and 5 and event B consist of out
come 4 and 5. Find the probability the either A or B occurs
b.
Home Work Questions (Chapter Two)
Q1: Fill in the missing components of the following frequency distribution constructed for a
sample size of 50:
Class
Frequency
Relative
frequency
7.85 less than
less than 8.05
8.05 less than
less than 8.25
8.25 less than
Home Work Questions (Chapter One)
Q1:
Define each of the following statistical terms:
a. Descriptive statistics
b. Statistical inference
c. Population
d. Sample
Q2:
Explain whether each of the following represents a population or a sample.
a. Number of go
STAT 211 Business Statistics I
Some Useful Formulas
( x
x
)
2
x
2
n (x ) 2
S=
P ( E 1 or E 2 ) = P ( E 1) + P ( E 2 )
P ( E 1 and E 2 )
n 1
=
n 1
P ( E 1 and E 2 )
P ( E 1 E 2) =
P ( E 2)
x
n x
n!
P(x ) =
pq
x !( n x ) !
, = E ( X ) = n p , = npq
( t )
King Fahd University of Petroleum & Minerals
STAT211: BUSINESS STATISTICS I
Homework number:_
Student name:_
Student number:_
Serial number:_
Section number:_
1
Chapter Ten
Estimation for Two Population Parameters
Chspter Goals:
After completing this chapter, you should be able to:
Form interval estimates for
two independent population means
Standard deviations known
Standard deviations unknown
two means from
1
Chapter Eight
Estimating Single population Parameters
Goals of chapter:
After completing this chapter, you should be able to:
Distinguish between a point estimate and a confidence interval estimate
Construct and interpret a confidence interval estimate
1
Chapter Seven
Sampling Distributions
Chapter Goals:
After completing this chapter, you should be able to:
To distinguish between different sampling methods
The concept of the sampling distribution
Determine the mean and standard deviation for the sampli
1
Chapter Six
Introduction to Continuous Probability Distributions
Chapter Goals:
After completing this chapter, you should be able to
To compute probabilities from the normal distribution
To use the normal probability plot to determine whether a set of d
1
Chapter 5
Some Important Discrete Probability Distributions
Chapter Goals:
After completing this chapter, you should be able to:
To calculate and interpret the expected value of a discrete random variable.
Apply the binomial distribution to business dec
Stat 211- Term 102
Chapter 4
Basic Probability
Chapter Goals:
After completing this chapter, you should be able to:
Explain three approaches to assessing probabilities
Apply common rules of probability( Addition Rule & Multiplication Rule)
Use Bayes Theor
STAT 211 Term102
Chapter Three
Numerical Descriptive Measures
Chapter Goals:
After completing this chapter, you should be able to:
To describe the properties of central tendency, the variation , and the shape in
numerical data.
To calculate descriptive su