Psychology 100A: McAuliffe
Fall 2013
Homework 2: Answers with explanations
1. If the distribution of IQ is centered at 100 , and has a standard deviation of 10, then what is the IQ Z-score of someone
Point Estimate and Confidence Intervals
Range of values around a sample statistic that have a certain probability
T distribution
Sampling distribution we need to know if we dont know sigma sub x
Con
12/3/12 6:43 PM
Fall 2012
Homework 1: Answers with explanations
1. On a game show, a car is hidden behind one of 5 doors. You randomly select 2 doors. The host knows where the car is and then
opens 1
12/4/12 8:43 PM
Fall 2012
Midterm 1: Version A: Answers with explanations
1. Are most distributions that we consider "normal" perfectly asymptotic?
A) No, many distributions have a very weak violation
12/4/12 8:43 PM
Fall 2012
Midterm 2: Version B: Answers with explanations
1. Consider an independent t-test comparing two groups. If group 1 has a variance of 2 with 5 subjects, and group 2 has a vari
12/5/13
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Psychology 100A: Moran
Fall 2013
(Form A: Special code K=0) Midterm 2: Answers with explanations
1 . Co n sid er
PSYCH 100A Practice Final
1. Which of the following is used to predict one set of scores from a different set of scores?
(a) parameter
(b) statistical hypothesis test
(c) correlation
(d) regression an
Psych 100A 11/10/08
Week 7 Homework
All problems are in the Kiess textbook unless specified otherwise
1.) 2.) 3.)
Testing your Knowledge 9.2 Testing your knowledge 9.3 Review Questions Ch. 9
#3 b
Psych 100A Section
Week 1
Question 1
Which of the following is a variable?
A. The number of days in the month of
September.
B. The number of players allowed to be on
the field during a football game.
11/25/13
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Psychology 100A: Moran
Fall 2013
Homework 6: Answers with explanations
1 . Co n sid er th e h y p o th esis test th at ask s th e q
Psych 100A 10/8/08 Wk 2 All the assignments are in the Kiess textbook, if not otherwise specified. (1) Testing your knowledge 6.2: 3b&c (2) Testing your knowledge 6.3: 2 (3) Review questions 6: 3g (4)
12/3/12 6:46 PM
Fall 2012
Homework 5: Answers with explanations
1. What effects are likely in this graph?
A) 1 main effect and 1 interaction
B) 2 main effect and 1 interaction
C) 1 main effect and no
12/3/12 6:45 PM
Fall 2012
Homework 4: Answers with explanations
1. Which of the following statements about power are true?
1. Power is the portion of the second distribution above the critical value o
Psychology 100A: McAuliffe
Fall 2013
Homework 3: Answers with explanations
1. If the Null hypothesis is false in reality, what are the two possible outcomes of a hypothesis test and what are their pro
Fall 2012Midterm 1: Version A: Answers with explanations
1. Are most distributions that we consider "normal" perfectly asymptotic?
A) No, many distributions have a very weak violation of asymptoticnes
1. Consider the following information for a sample size calculation (normal score distribution with 1 known and of population 1 given):
Power=0.6,1=100,X = 10,Tails=2,=.05.
What is the sample size nee
Introduction to
Statistics
100a
Ainsworth
1
What is Statistics?
Statistics refers to the methods or
procedures used to:
Organize/Summarize data
Analyze data
Draw inferences (extract meaning) from data
TheBestStatistics.Info
12/2/12 8:18 PM
Introduction
The simplest type of hypothesis test is the Single Sample Z test. This test compares a
sample mean against a distribution of population means to det
12/4/12 8:43 PM
Fall 2012
Midterm 2: Version B: Answers with explanations
1. Consider an independent t-test comparing two groups. If group 1 has a variance of 2 with 5 subjects, and group 2 has a vari
12/5/13
www.the be ststa tistic s.inf o/sta /sta pr ot/z a c hmo/mid3- a nswe r s.html
Psychology 100A: Moran
Fall 2013
Midterm 3: Answers with explanations
1 . If th e n u ll h y p o th esis is rejec
Spring 2013
Midterm 3: Answers with explanations
1. Consider the hypothesis test that examines how study method and study time affect memory: the scores in the groups are not related.
study time
study
TheBestStatistics.Info
12/2/12 8:10 PM
Why Statistics?
Let's start with some truth most students hate statistics. If you're reading this, you are likely taking a stats course because you have to
(usua
Psychology 100A: McAuliffe
Fall 2013
Homework 1: Answers with explanations
1. A number appears on a console of a nuclear power plant where each number represents a different kind of problem, and the h
Psychology 100A: McAuliffe
Summer C 2013
Final Exam: Answers with explanations
1. Are most distributions that we consider "normal" perfectly asymptotic?
A) Yes, but only when we are dealing with bimod
12/8/12 12:56 PM
Fall 2012
Homework 6: Answers with explanations
1. If I want to see how the number of cookies eaten each year relates to the amount of milk each year, what kind of analysis should I
p
12/5/13
www.the be ststa tistic s.inf o/sta /sta pr ot/z a c hmo/mid1- a nswe r s.html
Psychology 100A: Moran
Fall 2013
(Form A: Special code K=0) Midterm 1: Answers with explanations
1 . If X is th e
4/3/2014
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Psychology 100A: McAuliffe
Summer C 2013
Final Exam: Answers with explanations
1 . Are mo st d istrib u tio n s th a
12/3/12 6:46 PM
Fall 2012
Homework 5: Answers with explanations
1. What effects are likely in this graph?
A) 1 main effect and 1 interaction
B) 2 main effect and 1 interaction
C) 1 main effect and no
12/3/12 6:44 PM
Fall 2012
Homework 2: Answers with explanations
1. When are sampling mean distributions normal?
A) When the mean distribution is created from a score distribution that is normal.
B) Wh
Important Terminology
Population vs. sample
Estimation And Sampling Error
Parameter vs. estimate
Computer simulation
Sampling error
Sampling distribution of estimates
1
Statistical Inference
Researche
Important Terminology
Categorical vs. continuous variables
Variables,
Measurement Scales,
And Distributions
Nominal, ordinal, and continuous scales
Scale scores
Distributions
Distribution center, spre
Important Terminology
Central tendency
Central Tendency
Mean, median, and mode
Population vs. sample
Parameter vs. estimate
1
Overview
2
Center Of The Distribution
Measures of central tendency identif
Important Concepts
Standardizing
Standardizing Distributions
Standard scores
z-Scores
Standardized mean difference
1
2
Standardized Score Scales
IQ Scale
Many physical variables (e.g., age, height,
we