PSY 340 -- Exam 1 (Questions and answers) LATEST UPDATE
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Module
PSY 340
Institution
PSY 340
A(n) _______ is the larger group to which a researcher makes inferences based on the
particular set of participants studied - ️️population
A statistics professor discovers that the mean score and the mode score for the latest
class exam are the same. This would be possible for which of the f...
PSY 340 -- Exam 1
A(n) _______ is the larger group to which a researcher makes inferences based on the
particular set of participants studied - ✔️✔️population
A statistics professor discovers that the mean score and the mode score for the latest
class exam are the same. This would be possible for which of the following distribution
shapes? - ✔️✔️Normal
The first step in figuring the variance is figuring each_________ (the difference between
the score and the mean). - ✔️✔️deviation score
When a distribution is skewed to the right__________ - ✔️✔️the mean is greater than
the median.
The most common single number in a distribution of scores is the________ -
✔️✔️Mode
Based on the scores 1, 2, 3, 4, 5, 6, 6, 8, 8, 8, 9, and 10, a score 8 is the______ -
✔️✔️Mode
The _________ is approximately the average that a score differs from the mean. -
✔️✔️Standard Deviation
When calculating the variance in a population, you divide the sum of squared deviations
by _________ - ✔️✔️N
The average of the squared deviations from the mean is called the______ -
✔️✔️Variance
The median is greater than the mean in a distribution that is____________ -
✔️✔️skewed to the left.
_______ is a general name for the representative value of a group of scores. -
✔️✔️Central tendency
A measure of the typical or representative value that is not much affected by outliers is
the ________ - ✔️✔️Mode and Median
The variance is the same as the ________ - ✔️✔️average of the squared deviations.
, The standard deviation is ______ of the variance(s) - ✔️✔️the square root
Which of the following is NOT an advantage of Z scores? - ✔️✔️You can easily tell the
shape of the scores' distribution
Which of the following would best describe the normal curve? - ✔️✔️Unimodal, roughly
symmetrical, and bell-shaped.
Blaise Pascal is mainly associated historically with _____ - ✔️✔️probability theory
The _________ interpretation of probability is the understanding of probability as the
degree of one's certainty that a particular outcome will occur - ✔️✔️subjective
Fifty years ago, opinion polls often used the _________ method of sampling, which is
now largely discredited - ✔️✔️quota
You have a fish tank full of tropical salt-water fish and you need to know the exact salt
content of the water. To test it, you take a cup and scoop some of the water out. In
statistical language, the scoop of water is a _______ - ✔️✔️sample
Which of the following is the symbol for the mean of a population? - ✔️✔️μ
If you conduct a survey by giving out a questionnaire to the people you meet (and who
are willing to take your questionnaire) on a given evening, you are using _______
selection - ✔️✔️haphazard
In a distribution of Z scores, the mean is always ______ - ✔️✔️0
In a normal curve approximately _____ percent of the scores are between one and two
standard deviations above the mean - ✔️✔️14
In a normal curve approximately _____ percent of the scores are lower than two
standard deviations below the mean - ✔️✔️2
The fact that probabilities are proportions means that they________ - ✔️✔️can't be
lower than zero or more than one
Relative frequency is ______ - ✔️✔️the number of times something occurs relative to
the number of times it could have occured
The mean, standard deviation, and the variance of a population are called population
________ - ✔️✔️parameters
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