Statistics 528 - Lecture 5
Section 1.3 cont.
Normal Distributions
•
•
•
•
All normal distributions have the same shape - symmetric, unimodal,
bell-shaped
The mean (µ) and standard deviation (σ) comple
Statistics 528 - Lecture 5
Section 1.3 cont.
Normal Distributions
•
•
•
All normal distributions have the same shape - symmetric, unimodal,
bell-shaped
The mean (µ) and standard deviation (σ) complete
Statistics 528 - Lecture 4
Section 1.3
Relative Frequency of Scores Less Than or Equal to 6.0
Density Curves
Mathematical model for the distribution of a variable
Alternative to graphical and numerica
Statistics 528 - Lecture 4
Section 1.3
Density Curves
Mathematical model for the distribution of a variable
Alternative to graphical and numerical summaries
Idealized description - histogram of the da
Statistics 528 - Lecture 3
Section 1.1/1.2
Graphical and Numerical Summaries of Data
Modes
Shape of a Distribution
Question: Does the distribution have one or several major peaks?
Modes
Symmetric vs
Statistics 528 - Lecture 3
Section 1.1/1.2
Graphical and Numerical Summaries of Data
Shape of a Distribution
Modes
Symmetric vs. Skewed
Outliers
Measures of the Center
mean
median
Measures of Spr
Statistics 528 - Lecture 2
Section 1.1
Displaying Distributions with Graphs
• Issue: How do we examine and describe the main features
of a data set?
• We do exploratory data analysis. It involves
– ex
Statistics 528: Homework 8
Due Friday, March 12
1. IPS Section 6.1, exercises 6.7, 6.10, 6.16, 6.22.
For exercise 6.7, use Minitab to compute the sample mean. Then compute the
confidence intervals two
Statistics 528 – Homework 7 Solutions
5.2
(a) No, not a fixed number of trials.
(b) Yes, we choose a sample of fixed size and since 100 persons are chosen at random,
each person in the sample has the
Statistics 528: Homework 7
Due Monday, March 1
1. IPS Section 5.1, exercises 5.2, 5.6, 5.8, 5.14
Use Minitab for the calculation of binomial probabilities (see lecture notes 19).
2. IPS Section 5.2, e
Statistics 528 – Homework 6 Solutions
4.10
(a) The sample space would be {female, male}.
(b) The sample space would be {6, 7, …, 20}.
(c) The sample space would be the interval [2.5, 6]/min.
(d) For l
Statistics 528 – Homework 5 Solutions
Corrected Version
3.8
(a) In the study, no deliberate assignment of the anesthetics to the patients was done
in order to see the effect of the anesthetics on deat
Statistics 528 – Homework 4 Solutions
2.40
(a)
Absorbance
200
100
0
0
1000
2000
Nitrates
Minitab gives the correlation 1.0 (in fact, .99994). Note that it is rounded up.
So, recalibration would not be
Statistics 528: Homework 4
Due Wednesday, February 4
1. IPS Section 2.3, exercises 2.40, 2.46, 2.52
2. IPS Section 2.4, exercises 2.58, 2.64
NOTE: See lecture notes 10 for information on performing le
Statistics 528 - HW3 Solutions
2.1
(a) Grade would be response and time of study would be explanatory.
(b) Relationship.
(c) Rain would be explanatory and yield would be response.
(d) Relationship.
(e
Statistics 528: Homework 3
Due Friday, January 30
1. IPS Section 2.1, exercises 2.1, 2.4, 2.8, 2.12
Making a scatterplot in MINITAB:
Select Graph-Plot and then choose the variable for the X (horizonta
Statistics 528: Homework 2 Solutions
1.41 There are several gaps in the data, as can be seen from the histogram.
Minitab Result:
Min
2508
Q1
13278
Med
17022
Q3
23568
Max
26241
Q1
13385
Med
17022.5
Q3
Statistics 528: Homework 2
Due Friday, January 23
1. IPS Section 1.2 exercises 1.41, 1.45, 1.50, 1.58, 1.72
2. IPS Section 1.3 exercises 1.78, 1.86, 1.88, 1.98, 1.112, 1.140
Problem 1.140 is a bit mor
Stat 528 - Homework 1 Solutions
1.2
The individuals of the set of data are the students: Advani, Barton, etc.
The data contain the values of students, major, points and grade. So the variables are
Maj
Statistics 528: Homework 1
Due Wednesday, January 14
1. Getting Started with MINITAB: Work through MINITAB Handout 1. Using the
alfalfa data, carry out the following.
a) Make boxplots of
, split by
.
x 6 4 d 6 4 3 8 ) 0 E # 6 E | ) # 3 6 f 3 2 0% f 0 3% & & E 0%
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Statistics 528: Minitab Handout 1
Throughout the STAT 528-530 sequence, you will be asked to perform numerous statistical
calculations with the aid of the Minitab software package. This handout will g
Name:_
Statistics 528 Midterm Solutions
Winter 2004
INSTRUCTIONS
Show your work on all problems to receive full credit.
Problem 1 (15 points)
In a statistics class with 136 students, the professor rec