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WorksheetsBiostatistics BGY3701
Total questions: 21
Worksheet time: 16mins
Which of these measures can be used to present an average for data?
Standard deviation, range and mean
Mean, beta and normal distribution
Median, range, normal distribution
Mean, median and mode
Consider data that are normal distribution, spread is increased and height of curve is decreased for the
Smaller value of variance
Larger value of means
Larger value of standard deviation
Smaller value of standard deviation
The area under a standard normal distribution curve is?
0
1
95%
∞
Formula to calculate standardized normal random variable (Z score) is
σx−μ
σx+μ
μx−σ
μx+σ
What is alpha?
Type I error
The probability of rejecting the null when it is true (false positive)
Usually set at 5 %
These all basically refer to the same thing
When the sample size ≤ 30 the test used is
Z test
Chi square test
t test
F test
In t-distribution, if sample size increases, it becomes close to
Z-distribution
F distribution
Binomial-distribution
Chi-square distribution
Conducting multiple t-tests increases the likelihood of which of the following?
Homogeneity
Type I error
Type II error
Establishing normality
Which of these is NOT a probability distribution?
F
Binomial
Normal
Paranormal
Weibull
For what is the ‘Variable View’ in IBM SPSS’s data editor used?
Writing Syntax
Entering data
Viewing output from data analysis.
Defining characteristics of variables.
For a two-factor experiment with 2 levels of factor A and 3 levels of factor B and n = 10 in each treatment condition, there is a total of _______ subjects in each level of factor A and a total of ______ subjects in factor B
10, 10
20, 30
30, 20
60, 60
What type of data do you need for a chi-square test?
Categorical
Ordinal
Scale
Interval
Chi-square test for independence assesses which of the following?
It assesses whether there is a significant difference between two categorical variables
It assesses whether there is a relationship between the population and the sample
It assesses whether there is a relationship between two categorical variables
It assesses whether there is significant difference between scores taken at time 1 and those taken at time 2
For which of the following correlations should the data points be clustered most closely around a straight line?
r = 0.1
r = 0.5
r = - 0.8
There is no relationship between the value of r and how close the data points are to a straight line
If the Pearson correlation between X and Y is r = 0.8, then the coefficient of determination (r2) predicts 0.16 (or 16%) of the variance in the Y scores
True
False
What is the first stage in statistics?
Collect data
Identify the group of variables to be studied
Review the materials
Analyze data
Summarize data
How you describe your BGY3701 lecturers?
Funny
Short
Laidback
Evil
Accepting a false null hypothesis is an example of what?
Type I error
Type II error
Chance
Experimenter bias
A researcher measured the same group of peoples' reactions while watching horror films and compared them to when watching romance films. The resulting data were skewed. What test should be used to analyse the data?
Independent t-test
Chi square test
Wilcoxon signed-rank test
Mann-Whitney test
Whitney Houston test
You have conducted a study comparing Arts, Science and Engineering students on a measure of leadership skills. There are unequal group sizes and the data is skewed so you need to use a non-parametric test. Which test would you choose?
Wilcoxon
Kruskal Wallis
ANOVA
Mann Whitney
In a survey at local bistro, people were shown adverts for two rival coffee brands, which they then rated "1 to 10" on the likelihood of buying (score 10 being "definitely going to buy"). Two sets of participants gave ratings to the two brands. Which test do we use?
Kruskal Wallis test
Mann Whitney U test
Wilcoxon Test
Independent t-test
Man Rogosa Sharpe test
