PNB 3XE3 Study Guide - Quiz Guide: Odds Ratio, Contingency Table, Normal Distribution

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Published on 9 Mar 2020
School
McMaster University
Department
Psychology, Neuroscience & Behaviour
Course
PNB 3XE3
Chapter 13:
Homework 7
1. Given the data, what is the odds ratio? How much more likely is someone to be
unfaithful if they are unhappy compared to if they are happy?
a) 0.486
b) 0.171
c) 2.84
d) none of these
2. Calculate Pearson’s chi-square for this contingency table:
Reptiles
Mammals
Birds
Men
24
35
20
Women
15
47
12
a) 19.41
b) 1,685.5
c) 1.62
d) 5.67
e) none of these
3. Given the data, what are the odds of being unfaithful if happy?
a) 0.486
b) 0.171
c) 2.84
d) none of these
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4. If you have low frequencies in one or more cells …
a) yate’s continuity correction is an ideal alternative to the ci-square test
b) yate’s continuity correction overcorrects, producing a test statistic that is too small
c) yate’s continuity correction under corrects, producing a test statistic that is too large
d) all of the above
5. In the ci-square test, the expected value of a cell:
a) takes into account how many cases are in the row, totalled across columns
b) takes into account how many cases are in the column, totalled across rows
c) is rowsj x column totali / n
d) all of the above
6. A recent study in the media has claimed that women who eat breakfast every day
are more likely to have boy babies than girl babies. Imagine you conducted a study
to investigate this in women from two different age groups (18-30 and 31-43).
Looking at the output tables below, which of the following sentences best describes
the results?
a) the model is a poor fit to the data
b) there was a significant two-way interaction between eating breakfast and age group of the
mother
c) women who ate breakfast were significantly more likely to give birth to baby boys than
girls
d) whether or not a woman eats breakfast significantly affects the gender of her baby at any
age
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7. Which assumption is important in a chi-square test?
a) normal sampling distribution
b) homoscedasticity
c) independent errors
d) all of the above
8. The model pictured here is the:
a) null hypothesis
b) alternative hypothesis
c) experimental hypothesis
d) none of the above
9. When calculating the ci-square, why do you divide each squared difference by the
expected value?
a) to avoid meaningless inflation due to sample size
b) to take into account how noisy the signal is
c) this is what tells you how close your findings are to your prediction
d) all of the above
10. In a chi-square test, you can calculate the fit of the model:
a) by subtracting the difference between expected and measured values for each call, and
the summing those differences
b) by adding the total for the relevant column to the total for the relevant row and dividing
the product by the total number of cases
c) by adding up the squared differences between the observed values of the outcome and the
predicted values
d) none of the above
11. When calculating the expected values in the chi-square test, which of the following is
FALSE?
a) the expected value of the four cells are usually the same
b) the expected value of the four cells need not be the same
c) the expected values of the four cells cannot be the same
d) the expected values of the four cells must be the same
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Document Summary

How much more likely is someone to be unfaithful if they are unhappy compared to if they are happy: 0. 486, 0. 171, 2. 84, none of these, calculate pearson"s chi-square for this contingency table: Imagine you conducted a study to investigate this in women from two different age groups (18-30 and 31-43). A chi-square test produced the spss output below. 12: 5. 7, 1. 68, 83. 3, 75. 28, none of these, men and women were asked which type of animal they thought made the best pets. Homework 8: you are studying whether room temperature is correlated with performance on a digit memory test. M = -. 50, 95% ci [-. 86, . 19], p = . 144. M = -. 62, 95% ci [-. 89, -. 16], p = . 02: all of the above, the table below contains scores from six people on two different scales that measure attitudes towards reality tv shows.

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