Final Exam Review PSY 136
One
A _____________ tailed test is used for a directional hypothesis.
weak, positive
A correlation coefficient of .15 indicates ___________________
the raw score or x value is below the mean
A negative z score indicates that ________________________
Directional
A researcher hypothesizes that adults are more likely than juveniles to have been arrested for spending. This is a _____________________________ hypothesis.
no relationship
An r value of zero represents _____________________
strength and direction
Correlation r indicates
interval or ratio
Correlation utilizes variables that are _________________ levels of measurement
Increase sample size
How can standard error be decreased?
95%
How confident are we that a population parameter lies within two standard error units of the sample statistics?
t distribution or t value is the same as z distributions or z value
If n becomes large, greater than 30 then _______________________________
-1 to +1
If the coefficient of termination (r square) is equal to 1, then the coefficient can be _______________
12
If the regression equation is Y= 12 + 1.8x the intercept is _______.
reject null hypothesis
If the significance is less than or equal to .05 then ___________.
reject the null hypothesis
Larger the t value, the more likely we are to
increase the sample size
One common method for decreasing standard error is to
Estimated difference between the sample statistic and population parameter
Standard error is best defined as
between group variance > within group variance
The F ratio indicates
residual error
The amount of variation in the dependent variable that is unexplained or unaccounted for the regression model is ___________________
True
The dependent variable is in the form of the continuous variable (interval or ration level)
the larger the z score value
The more distance the raw score is from its mean score ________________
increases, decreases
The negative slope indicates that if X _________ in value, then Y _________ in value
Probability
The number of times a particular outcome can occur divided by the number of times that any outcome can occur is known as
intercept
The point at which the regression line crosses the Y axis is an
slope and intercept
The regression line is a function of the __________ and the ____________.
F test
The statistical test used to determine the significance of a regression model is
True
There is no practical limit to the number of groups
higher
We expect between group difference should be ____________ than between group difference
34.13%
What percent of the area under the normal curve lies between the mean (0) and 1 standard deviation unit above the mean?
Type II Error
When the null hypothesis is accepted when it is false; referred to as beta
confidence level
When the sample size is small (≤ 30), the t distribution is used to measure the _________________ .
mean
When z=0, the raw score (x) equals
Bimodal
Which of the following is NOT a characteristic of the normal curve?
William S. Gossett
Who developed the distributions for small sample under the pseudonym 'Student'?
Independent t test
a test of difference between sample means
one-way analysis of variance
analysis of variance in which there is only one grouping variable
Degree of freedom
n-1
Null hypothesis
states that there is no relationship
Analysis of variance (ANOVA)
statistical test that is designed to examine the variability among three or more groups
Type I Error
when the null hypothesis is rejected when it is true; referred to as alpha or level of significance
