STA 250 Inference Problem Analysis Worksheet
STEP 1
What is the subject of the research or inference problem?
_
STEP 2
State the Null and Alternative (Research) hypotheses
NULL Hypothesis _
ALTERNATIVE Hypothesis _
_
STEP 3
Define the elements of the prob
The sign tell the direction of the Pearson correlation.
The numerical value indicates the strength of the consistency of the Pearson correlation.
SP= - 2
r =.0688
It does NOT affect the correlation; it stays the same r =.0688
It does NOT affect the correl
Chapter 10 Questions
2. Describe what is measured by the estimated standard error in the bottom of the independentmeasures t statistic. For the independent-measures t statistic, the estimated standard error
measures the standard distance between a sample
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Class: PSY 242
The war of the Roses
1) Briefly describe the change in the personalities of Mr. & Mrs. Rose over time.
Oliver rose was a Harvard law school student and met Barber at an auction. They
became friends and spend one night together in a hotel. E
Date of Submission: 5/6/2016
Data Assignment #4: ANOVA - Means comparisons for three or more groups
DATASET: Randstudy.sav
Research question: Is the average age at first arrest the same for individuals of all
ethnicities? Use the RandStudy dataset to expl
Class: STA 250
Date: 4/3/16
Data Assignment #3: Evaluating Prison Programs
Research situation: A Program to Improve Reading Scores
At the beginning of 2008, a new reading and comprehension program was offered to
prisoners in two prisons in your state. Pri
Class: STA 250
Date: 3/13/16
Date Assignment # 2
PART 1 Review of Level of Measurement
You should be able to identify what type of variable you are working with by exampling the
format and distribution in a dataset. One way to do this is to run a frequenc
Date of Submission: 3/12/16
STA 250 - Fall 2015 - First Data Assignment
NCSD: National Crime Survey Data: Attitudes about Crime and Safety
ANSWER TEMPLATE
STEP 1: Identify your Independent and Dependent variables and their levels of measurement:
Independe
SPSS Z SCORE PRACTICE ASSIGNMENT/ CRIME AND DEMOGRAPHICS DATA FILE.
Copy and Paste your tables and charts into this file and answer all questions.
1- What is the level of measurement for the variable SCS133 and what is this
variable measuring/questioning?
Variability
Only do measures of variability for continuous variables
Measures of variability
3 measures of variability:
o Range
Very unreliable
X(maximum) X (minimum)=Range
o Variance
o Standard Deviation
The most important measure of variability
Defi
Raw score = X value
Z = -1.00
U = 80
=
In order to do z-scores it can only be a normal distribution
How to create z-scores
Calculating the z-score proportion
When its below just use the chart
When its above you find it on the chart and then subtract it
Z score Practice Assignment
1- The midterm exam scores in Professor Roseners Statistics section 17 class formed a normal
distribution, so each student is interested in not just knowing their original score, but also
their Z score (standard score). Mary re
Step 1
Step 1: Sketch the distribution and identify the mean and standard deviation.
Then, find the approximate location of the specified score and draw a vertical line
through the distribution. For this example, X = 95 is located below the mean by
roughl
Terms
Variable
Nominal
Proportion is equal to the decimal form of a percentage
Cases - is also referred to as N
Charts/Tables
Frequency distribution table
Cant put Continuous in a pie or bar chart
Use histogram for Continuous levels of measurement
Histogr