Data File 3
Show all work
Chapter Five
1) If light bulbs have lives that are normally distributed with a mean of 2500 hours and a
standard deviation of 500 hours, what percentage of light bulbs have a
4) Discuss some of the common uses of IQ tests. Do you think that IQ tests should be used
for these purposes? Does the Flynn effect alter your thoughts about the uses of IQ test?
Explain.
IQ tests wer
Data File 5
NORTHCENTRAL UNIVERSITY
ASSIGNMENT COVER SHEET
Student: Jesse L. Crumbley III
THIS FORM MUST BE COMPLETELY FILLED IN
Follow these procedures: If requested by your instructor, please includ
KEY FORMULAS Jaggia and Kelly Essentials of Business Statistics Communicating with Numbers
g
Chapter 3: Numerical Descriptive Measures
Topic
Formula
Sample Mean
x
Weighted Mean
x wi xi
Range
Range =
Formula for quiz 4
Topic
Test Statistic for
Formula
1 2
using z-statistic
z
x1 x2 d 0
z
Test Statistic for Testing
p1 p2
if
d0
is zero
p=
Finding the t-statistic for hypothesis test
12 22
n1 n2
p1 p2
Formula for Final Exam
Confidence Interval for
using z distribution
Confidence Interval for
using t distribution
x z
How do we differentiate which one belongs to null and which one to alternative hypo
KEY FORMULAS Jaggia and Kelly Essentials of Business Statistics Communicating with Numbers
g
Chapter 3: Numerical Descriptive Measures
Topic
Formula
Weighted Mean
x wi xi
Sample Variance
s2
Sample St
P (A u B) = P(A) + P(B ) P(A n B).
P ( A u B )c) = 1 P (A u B ).
P ( A n B ) = P (A B) P(A)
For Continuous
a) Mean =
a+b
2
where a is lower limit and b is upper limit.
b) Standard deviation =
2
( ba )
Formula for quiz 3
Topic
Formula
Confidence Interval for
Confidence Interval for
using z distribution
x z
using t distribution
x t
2
n
s
2,df
2
z 2
n
E
z 2
n
E
2
Required Sample Size when Estima
Multiple choice
Answers are given in green color
1.1
The members of each basketball team wear numbers on the back of their
jerseys. What scale of measurement are these numbers considered?
A. Nominal