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WorksheetsYR 2 Week 6_TEST 2 Choosing a Stats test
Total questions: 27
Worksheet time: 15mins
What assumptions about the data need to be met to use a parametric test?
Homogeneity of variance & normally distributed data
Homogeneity of distributions
When would a non-parametric test be used?
When the data is nominal or ordinal
The psychologist found the results were significant at p 0.05 - is the null hypothesis rejected or accepted?
When choosing a stats test, it depends on what design is used. What is a research design?
Whether the hypothesis is 1.tailed or 2.tailed.
A research design is whether the study is an experiment or a correlation
A research design is whether the study used related data or unrelated data
Why is an independent measures design referred to as ‘unrelated’ data?
Different participants are used in each group, making the data from each group independent of one another.
Which Level of data would be used when investigating how long people take to get to college in minutes?
Which level of data would be used for testing how attractive Harry is on a scale of 1-10?
Which level of data would be used when investigating which mode of transport people use to get to college?
Interval data (intervals are known)
Nominal ( data in intervals )
Nominal (categorical data)
Ordinal data (intervals are unknown)
When choosing a stats test, it depends on the nature of the study. Which methodology looks to see if the IV effects the DV?
Experiments
When choosing a stats test, it depends on the nature of the study. Which methodology takes two data points from each participant?
Experiments: Looking at a difference
Correlation: Looking at the relationship between two variables
What type of study investigates a ‘relationship’ between two co-variables?
When using ‘Scoffing Cheesy Chips Will Make Someone Rather Understandably Porky’ how does the top of the table appear? (a)
When reading a critical value table, a psychologist needs to read the table across the top of the table and down the left column - to find the critical value, what 3 questions/bits of information need to be known?
Significance level, design, and whether an experiment or correlation.
Significance level, degrees of freedom (N), and hypothesis type (one-tailed or two-tailed).
What does N refer to?
N typically refers to the number of participants used
N is the Null hypothesis.
N represents the number of errors
N is the level of sigNificance used
What is the critical value for a 1. tailed hypothesis, for a 0.5 level of significance when N = 8?
1
0
Both
When choosing a parametric test (interval level data), the data has to achieve homogeneity of variance. What does this mean?
What is meant by a False Positive?
When you can't make a positive conclusion from the data because of a limited sample
When you incorrectly claim support for the Null (Ho) hypothesis when the H1 should have been accepted.
When you incorrectly claim support for the experimental hypothesis when the Null should have been accepted.
What is a Type 1 error, when does it occur & why does it happen?
A Type 1 error is the incorrect rejection of a true null hypothesis & it happens when the Level of Significance is too strict
A Type 1 error is the incorrect rejection of a true experimental hypothesis & it happens when the Level of Significance is too strict
A Type 1 error is the incorrect rejection of a true null hypothesis & it happens when the Level of Significance is too lenient.
What is the probability of making a type l error at p ≤ 0.1?
What is meant by a False Negative?
A False Negative is when a test incorrectly claims support for the Null hypothesis when there was a real difference/correlation
What is a Type 11 error, when does it occur & why does it happen?
A Type 11 error is the incorrect acceptance of a true null hypothesis & it can occur when the level of significance used is too strict
How can you reduce the risk of having a type l or type II error?
Distinguish between a Type I error and a Type II error.
Why is P<0.05 the accepted level of significance in psychology?
P<0.05 is the commonly accepted level used by psychologists as it reduces risk of type 1 & type 2 errors
Which level of data would be used when categorizing students by their favorite subject?
Interval data
Nominal data
Ordinal data
Ratio data
What is the probability of making a type II error at p ≤ 0.05?
0.05
0.1
0.2
0.95
Which level of data would be used when measuring the temperature in degrees Celsius?
Interval data
Nominal data
Ordinal data
Categorical data
