Ashford PSY325 2021 June Week 5 Weekly Review Latest

PSY325 Statistics for the Behavioral & Social Sciences

Week 5 Weekly Review   

Question 1A one-sample t value is statistically significant in which situation?

  The calculated t is equal to, or larger than the table value

  The calculated t is equal to or smaller than the table value

  The calculated t is equal to or smaller than .05

  The calculated t is equal to or larger than .05

 Question 2What is the similarity between the z test and the one-sample t-test?

  They both analyze differences between sample means

  They both analyze differences between a sample and a population

  They both determine the strength of the relationship between variables

  They both rely on ordinal scale data

 Question 3Turning raw scores into z scores accomplishes all of the following except which?

  Allows for scores from different tests to be compared directly

  Creates a common distribution where the mean is 0

  Creates a common distribution where the standard deviation is 1.0

  Makes the data involved in the transformation normal

Question 4The independent variable in either a before/after t

or a within subjects F is always of what data scale?

  Nominal

  Ordinal

  Interval

  Ratio

 Question 5Which lower-case letter is usually used to represent a correlation coefficient?

  n

  r

  p

  z

 Question 6How is the z-test different from z-score analysis?

  The z-test compares a sample to a population

  The z-test calculates a value of z which can be compared to Table A

  The z-test provides a way to evaluate how individuals compare to a population

  The z-test is based on how individual scores compare to a sample mean

 Question 7More widely scattered points in the scatter-plot indicate which?

  More variability in the x

variable

  More variability in the y

variable

  Normality in both variables

  Weaker relationships between variables

 Question 8Each point in a scatter plot represents which of the following?

  A predicted value

  A measure of either the x or the y variable

  The group to which the measure belongs

  The measure of both variables

 Question 9The chi-square test of independence has how many variables?

  1

  2

  3

  unlimited

 Question 10A type II decision error occurs in which of the following circumstances?

  the decision not to proceed with an analysis

  the decision to proceed when the analysis is flawed

  erroneously determining that a result is not significant

  erroneously determining that a result is significant

 Question 11Rejecting the null hypothesis is the same as saying which?

  Any differences are random differences

  The result is statistically significant

  The hypothesis of difference is rejected

  The research hypothesis is rejected

 Question 12In the set of numbers 2, 3, 3, 4, 4, 4, 5, 5, 6, which is the median?

  3

  4

  5

  6

 Question 13Another name for nominal data is _____.

  continuous

  categorical

  open-ended

  parametric

 Question 14Which of the following defines the intercept value in a regression solution?

  The value of y when x = 0

  The degree of error in the prediction

  The negative impact of x on y

  The change in y from +1.0 in x

 Question 15Which of the following is not a measure of central tendency?

  Mean

  Range

  Median

  Mode

 Question 16How are degrees of freedom related to critical values of rxy?

  Critical values increase in direct proportion to degrees of freedom

  Critical values decline as degrees of freedom increase

  Critical values are such that significance is difficult to establish with large samples

  Critical values allow degrees of freedom to be ignored in large samples

 Question 17What is the normality requirement for ordinary least squares regression?

  Both variables must be drawn from samples which are ordinal

  The solution must fit a normal distribution

  The populations from which the samples come must be normal

  Ordinary least square regression has no normality requirement

 Question 18The answer to which question defines the coefficient of determination, r2?

  What is the statistical relationship between x and y?

  How linear is the relationship between xand y?

  How much of y can be explained by changes in x?

  What is the variation in the x/yrelationship due to chance?

 Question 19The range of possible correlation values for the Pearson Correlation is which?

  From 0 to 1.0

  From 0 to 10.0

  From -.5 to +.5

  From -1.0 to +1.0

 Question 20Grouping people by their political party membership constitutes data of what scale?

  Nominal

  Ordinal

  Interval

  Ratio