Transcript Who Wants to be a Statistician?

Who Wants to be a Statistician?
Live from College Station!
Game Rules
• Using StataQuest,
students will be
selected randomly to
participate
• An ordering question
will be asked of the
first student on the list
• If the student gets it
right, he/she comes to
the “hot seat”
• If the student does not
get it right, it goes to
the next student
• This continues until
someone gets to the
hot seat
• You may earn up to
three points at the hot
seat
Game rules
• Correct answer +1 pts • If you are satisfied
with your points, you
• Incorrect - back to 0,
may stop
Question goes to next
on list for a chance for • So, let’s get started
the point
• You may use one of
three “lifelines” phone (or ask) a
friend, ask the class, or
50/50
Put the following topics in order,
as they were presented in class
A.
B.
C.
D.
F distribution
Chi-square curve
Normal curve
Student’s t
• Correct Order:
–
–
–
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Normal
Chi-Square
t
F
Which of the following is a
measure of spread?
A. Standard Deviation
B. Mean
C. Median
D. Proportion
50-50: A or C
A is correct!
Which of the following is a
robust measure of center?
A. Mean
B. Standard Deviation
C. Median
D. SIQR
50-50: Median, SIQR
Correct Answer: C
Which of the following graphs is best
suited for side by side comparisons?
A. Stem and Leaf
B. Box Plot
C. Histogram
D. Normal Quantile
50-50 B,D
B is correct!
Place the following in the order
they were presented in class
A.
B.
C.
D.
One Sample t
Rank-Sum
Two Sample t
ANOVA
• Correct Ordering
–
–
–
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One Sample t
Two Sample t
Rank Sum
ANOVA
Under which of the following
conditions is the sample mean
NOT normally distributed?
A. Large sample from a normal population
B. Small sample from a normal population
C. Large sample from a non-normal pop
D. Small sample from a non-normal pop
50-50: C or D
The correct answer is D!
Based on the box-plots below, which
SAMPLE has the highest median?
A
C
B
D
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•
•
•
•
A.
B.
C.
D.
E. Can’t tell from info
given.
• 50-50: A or E
• A is correct!
Which of the following terms
describe the data set graphed below?
A. Left skewed
B. Right skewed
C. Normal
D. Symmetric - heavy tails
E. Symmetric - light tails
50 - 50: A or B
B is correct!
Put the following procedures in
order: the one that requires the
most sums of squares first
A.
B.
C.
D.
Two-Way ANOVA
Blocked ANOVA
Two sample t
One-Way ANOVA
• Correct order is:
–
–
–
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Two way ANOVA (4)
Blocked ANOVA (3)
One way ANOVA (2)
Two sample t (0)
Which of the following should be
used to compare weekly study hours
between freshmen & sophomores?
A. One Sample t
B. Paired t
C. Two Sample t
D. Rank-Sum
E. C or D - it depends
50-50 C or E
E is correct!
Which of the following should be
used to compare weekly study hours
of students - categorized by
classification only?
A. One sample t
B. One way ANOVA
C. Two way ANOVA
D. Blocked ANOVA
50-50 B or C
B is correct!
Which of the following should be
used to compare weekly study
hours of students - categorized by
classification and major?
A. Two sample t
B. One way ANOVA
C. Blocked ANOVA
D. Two way ANOVA
E. C or D - it depends
50-50: C or E
E is correct!
Put the following examples in the
order they were presented in class:
A.
B.
C.
D.
Bug Traps
Exercise & Lactic Acid
Smoking Mommas
Frozen Dinners
• Correct Order
–
–
–
–
D.
B.
C.
A.
Which procedure should be run
after rejecting the null hypothesis
in one-way ANOVA?
A. Two Way ANOVA
B. One Way ANOVA
C. Two sample t
D. Tukey’s procedure
50-50 C or D
D is correct!
The null hypothesis is rejected
when
A. The p-value is less than a
B. The p-value is greater than a
C. The confidence interval includes the null
D. The CI does not include the null
E. A and D
50 - 50: B or E
E is correct!
Which of the following should be
tested first in two-way ANOVA?
A. H0: no interaction
B. H0: no A effect
C. H0: no B effect
D. Order doesn’t matter in two-way ANOVA
E. These tests are not part of two-way
ANOVA
50-50 A or E
A is correct!
Put the following graphs in the
order they have been presented
since Exam I:
A.
B.
C.
D.
Box plots
Normal Quantiles
Histogram
Stem and Leaf
• Correct Order
–
–
–
–
Stem and Leaf
Histogram
Box plots
Normal Quantiles
To compare two non-normal
populations with small samples, use
A. One sample t
B. Paired t
C. Two Sample t
D. Rank-Sum
50-50: B or D
D is correct!
Non-normality is BEST detected
with a
A. Box Plot
B. Stem and Leaf
C. Histogram
D. Normal Quantile Plot
50-50 C or D
D is correct!
The paired t test is equivalent to
A. Two sample t
B. One sample t on differences
C. Two way ANOVA
D. Blocked ANOVA
50-50 B or D
B is correct!
Put the three great statisticians in
the order they were first
mentioned in class
A. “Student”
B. Florence Nightingale
C. John W. Tukey
• Correct Order
– Nightingale
– “Student”
– Tukey
The null hypothesis is rejected
when
A. The p-value is less than a
B. The CI does not include the null value
C. The p-value is greater than a
D. The CI includes the null value
E. A and B
F. C and D
50-50: E or F
E is correct!
Find the mean of the data
represented in the stem-and-leaf
below:
5|7
6 | 03
A. 57
B. 60
C. 63
D. Not enough information
50-50: B or C
B is correct!
An interaction plot
A. Should have approximately parallel lines
if no interaction is present
B. Should have crossing lines if no
interaction is present
C. May have crossing lines - even if we fail
to reject the null hypothesis of no
interaction
D. A and C
50 - 50 A or D
D is correct!
Computaions Required
• Mean or Median from a small data set
• df for one-sample or paired t
Be sure to
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Go through the notes
Examine the HW and Quiz Keys
Get HW9 Key before leaving
Understand processes, not try to memorize
facts
• Interpret all four graphs: stem-and-leaf,
histogram, box-plot, normal quantile plot