Comm 190_ Exam 3, Quiz questions fully solved & updated
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Comm 190
Percentage
This is the statistic that describes how many participants per 100 have a certain characteristic
Inferential statistics
This branch of statistics helps researchers to generalize the results of a sample to a population
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Brainpower
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Descriptive st...
Comm 190: Exam 3, Quiz questions fully
solved & updated
Percentage - ANSWER- This is the statistic that describes how many participants
per 100 have a certain characteristic
Inferential statistics - ANSWER- This branch of statistics helps researchers to
generalize the results of a sample to a population
Descriptive statistics - ANSWER- This branch of statistics helps researchers to
summarize data so they can be easily comprehended
Multivariate statistic - ANSWER- This is a descriptive statistic that involves more
than two variables
Nominal - ANSWER- If a researcher asks participants to name the country in
which they were born, the researcher is using which scale of measurement?
Which two scales of measurement have equal distances between the amount of
possible responses? - ANSWER- Interval, Ratio
A researcher asks if voting behavior differs based on one's race. Which of these
variables is independent, and which is dependent? - ANSWER- IV = race; DV =
voting behavior
If 600 individuals in a population of 1,000 are Democrats, what is the
corresponding percentage of Democrats? - ANSWER- 60
When reporting a percentage, it is a good idea to also report the underlying
number of______. - ANSWER- cases
Percentages for different groups are expressed on a common scale with what
base? - ANSWER- 100
What is the base for a proportion? - ANSWER- 1
, What is the name of the curve that is symmetrical? - ANSWER- Normal curve
distribution has some extreme scores on the right, but not the left - ANSWER-
postitive
distribution has some extreme scores on the left, but not the right - ANSWER-
negative
If all individuals in a group have the same score on an exam, what is the value of
the standard deviation for the scores? - ANSWER- 0.00
The middle 68% of the participants in a normal distribution have scores between
what two values if the mean equals 100 and the standard deviation equals 15? -
ANSWER- 85 & 115
If the median for a group of participants is 25, what is the percentage of
participants with a score above 25? - ANSWER- 50%
Suppose a researcher reported that for Group X, the median equals 55.1 and the
IQR equals 30.0, while for Group Y, the median equals 62.9 and the IQR equals
25.0. Which group's scores are more variable? - ANSWER- Group X
What does the "p" in p-value stand for? - ANSWER- Probability
Which of the following p-values represents statistical significance if alpha is .05?
- ANSWER- p < .05
Do researchers reject the null hypothesis when the probability of its truth is high
or when the probability is low? - ANSWER- When the probability of its truth is low
Which of the following is a correct way to state what happens to the null
hypothesis if the probability is greater than .05? - ANSWER- The researcher fails
to reject the null hypothesis
When the relationship between two variables is perfect and inverse, what is the
value of r? - ANSWER- -1.00
Negative relationships can be weak OR strong - ANSWER- True
An r of -0.90 is stronger than an r of 0.50. - ANSWER- True
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