MCQs Flashcards
For questions 1 to 3, classify whether each variable is nominal or continuous:
Age
Continous
For questions 1 to 3, classify whether each variable is nominal or continuous:
Gender
Nominal
For questions 1 to 3, classify whether each variable is nominal or continuous:
Height
Continous
Which of the following best describes a confounding variable?
A variable that affects the outcome being measured as well as, or instead of, the independent variable
If a test is valid, what does this mean?
The test measures what it claims to measure
A variable that measures the effect that manipulating another variable has is known as:
A dependent variable
The discrepancy between the numbers used to represent something that we are trying to measure and the actual value of what we are measuring is called:
Measurement error
A frequency distribution in which low scores are most frequent (i.e. bars on the graph are highest on the left hand side) is said to be:
Positively skewed
Which of the following is designed to compensate for practice effects?
Counterbalancing
Variation due to variables that have not been measured is known as:
Unsystematic variation
The purpose of a control condition is to:
Allow inferences about cause
If the scores on a test have a mean of 26 and a standard deviation of 4, what is the z-score for a score of 18?
-2
The standard deviation is the square root of the:
variance
Complete the following sentence:
A large standard deviation (relative to the value of the mean itself):
indicates that the data points are distant from the mean (i.e. the mean is a poor fit of the data)
The probability is p = 0.80 that a patient with a certain disease will be successfully treated with a new medical treatment. Suppose that the treatment is used on 40 patients. What is the “expected value” of the number of patients who are successfully treated? - (2)
32
simply multiply each value of the random variable by its probability and add the products.
Which of these variables would be considered not to have met the assumptions of parametric tests based on the normal distribution?
Hint: Many statistical tests rely on having data measured at the interval level.) - (2)
Gender
The correct answer is c) Gender. This is because this variable is not measured at the interval level and would not be normally distributed.
The test statistics we use to assess a linear model are usually _______ based on the normal distribution.
parametric tests
Which of the following is not an assumption of the general linear model?
Dependence
Looking at the table below, which of the following statements is the most accurate?
For the number of hours spent practising, there is not an issue with kurtosis
How many outliers are in this graph in total?