NORMAL PROBABILITY PLOT
Can you conclude that the population the data comes from is normally distributed?
LOCATION
x
f
z score
1
15.8
0.0248
-1.96
2
3
16.7
18.2
0.0644
0.1040
-1.52
-1.26
4
18.4
0.1436
-1.06
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
EXAM 5 STUDY GUIDE (Chapters 9-11)
Chapter 9
1. Understand when a t statistic is used (instead of a z-score) for hypothesis testing.
-A t statistic is used in situations where the population variance (or standard deviation)
is not known. In this situation
Exam 2 Study Guide (Using the textbook chapter sections as an outline)
Chapter 3
3.1 Overview (The Reason for Measuring Central Tendency)
Central Tendency: is a statistical measure to determine a single score that defines the center of a
distribution. The
Exam 1 Study Guide
Chapter, Section, and Topic
1.1 Statistics, Science, and Observation
Definitions of Statistics be able to define and know the goals
Statistics consist of facts and figures such as average income, crime rate, birth rate and
average snowf
San Jos State University
Psychology Department
49032, Elementary Statistics, Section 10, FALL 2016
Instructor:
Steven Macramalla
Office Location:
Clark Hall 120
Telephone:
(831) 234-8451
Email:
[email protected]
Office Hours:
TuTh 12:30PM 1:30PM
Stats 95 Assignment 1
1. Using your data from the Cookie Exercise, construct a frequency table with all four columns,
and construct a frequency graph of your data. Identify the type of data you are using, and
make sure you are using the correct graphing m
Population - total # of participants that could potentially be included in research study
Sample - subset of population from where we collect data
Nominal: values differ in category or type
Ordinal: Value differ in relative quantity
Interval: Values equal
Ch7 Computations: (TESTING ONE SAMPLE MEAN)
Mean(X line)
(Add up all values)/N(number of values)
Standard Devaition(s)
Square root(summation(x^2)-(summation(x)^2/N)/(N-1)
State Null and Alternative
H0:mu=value
H1:mu=/=value
Calculate the degrees of freedo
- to measure students on their vocabulary and comprehension skills, researchers use a software program called Read Naturally
- Number of words correct per minute (WCPM)
- a way to analyze data that have been collected is to calculate descriptive statistic
Chapter 1
Inferential Statistics is to test hypotheses about populations
Population - total # of participants that could potentially be included in research study
Independent variable: cause; Dependent variable: effect
Sample - subset of population from w
To test hypothesis, regarding difference between sample mean (X line) and population mean (mu) on of two test can be used: the z test for one mean, or t-test for one mean
Z test is used when the population standard deviation (sideways q) for the variable
Final Review
Ch1
Independent variable is cause, while dependent is effect
Study of college hypothesized that females with higher levels of depressive symptoms will likely engage in casual sex than females with fewer
Independent Variable: Levels of depress
If you do not reject the null, you dont need to determine level of significance.
If you do not reject null, research analysis did not support hypothesis.
Chapter 13
Linear relationship: a relationship between variables that is appropriately represented by
Whole one sided area under normal curve is .5
So entire curve is 1 or close to it
If table only gives from 0 to a certain number, add that to .5 to get everything under that statistic
Z score formula: z=X(given score)-u(mean/average)/q thing(standard devi
Chapter 10: Errors in Hypothesis Testing, Statistical Power, and Effect Size
Steps of Hypothesis Testing
1. State a research hypothesis regarding the relationship between variables and collect data to be analyzed
2. A null hypothesis states a hypothesized
- Bar graph is a figure in which bars are used to represent the mean of the dependent variable for each level of the independent variable
- the sampling distribution of the difference is the difference of all possible values of the difference between two
Get all questions and answers in this notepad from Exams 1-4
Exam 1:
1. Research hypothesis may be thought of as a prediction.
2. Independent variable is cause, while dependent is effect
3. Men are worse than wp,em. Main problem is:It doe not identify ind
Process of Hypothesis Testing
- State an initial assumption and a mutually exclusive alternative to this assumption
Initial assumption: Person did not commit crime
Alternative to Initial: Person did commmit
- Analyze the collected evidence(data)
- Make de
Normal Distributions - distribution based on a population of an infinite number of scores calculated by a mathematical formula
4 distunguishing features: consist of infinite number of scores generated from mathematical formulas and tails go to infinity; U
Chapter 11
Differences between the means of two samples was evaluated using the t test for independent mean
t=(Xline1-Xline2)/(Ssub(Xline1-Xline2)
The numerator is the difference between the means of two groups and is referred to as between-group variabil
Stat 95 SPSS Assignment: Comparing Two Means using the Independent-samples t test
1. This exercise is taken from the textbook exercises in your syllabus, exercise 7.45. Z tests are
often used when a researcher wants to compare his or her sample to known p
Name: _ Date: _
A)
B)
C)
D)
1.The Pearson correlation coefficient is calculated as the average _ of two
standardized variables.
z score
reliability index
cross-product
validity coefficient
A)
B)
C)
D)
2.Which of the following values of the correlation coe
Stats 95 Assignment #3 ANOVA 1 Way, Correlation, Chi-Square
1. Draw a scatterplot and compute the Pearson correlation coefficient for the following set
of data.
Table: Scatterplot
X
3
2
1
6
Y
4
5
9
2
2. Is a movie's earnings related to its ratings? Data o