18 Questions
What happens to the median if the smallest value in a data set is increased?
The median remains the same
What does the standard deviation measure in a set of data?
The spread of the values
How does an increase in standard deviation affect the spread of data?
Increases the spread
What is the square of the standard deviation called?
Variance
Which statement is TRUE of the score distribution with different standard deviations (SDs) but equal means?
The scores of Set B have less variability than the scores in Set A
If the variance of a data set is correctly computed with the formula using n-1 in the denominator, which of the following is true?
The variance is underestimated
What characterizes a response variable in an experiment?
It is monitored to characterize system performance/behavior
Why is it important to address extraneous variables in experiment planning?
To avoid loss of information in interpreting effects of primary factors
Which probability sampling technique involves selecting every kth individual from a list after a random starting point?
Systematic Sampling
What does it mean when half of the observations in a data set are greater than the mean?
The data set is skewed to the right
In a normal distribution, which measure of central tendency is equal to the mode and the median?
Mean
What does a high standard deviation indicate about a data set?
There are extreme variations in the data set
What is the correct formula to calculate the standard deviation?
Square root of the variance
If a survey uses simple random sampling, what can be inferred about the selected sample?
It represents the entire population accurately
When calculating the mean salary of a group, which value is most susceptible to being affected by extreme outliers?
Mean
What is the primary reason behind using probability sampling techniques in research studies?
To ensure every individual has an equal chance of being selected
Which situation represents a type I error in hypothesis testing?
Rejecting a true null hypothesis
When planning an experiment, what term describes factors that could influence the response variable but are not the primary focus of study?
Extraneous variables
Test your knowledge on measures of central tendency like mean, median, and mode, as well as understanding standard deviation. Learn how to determine reliable measures of central tendency and how changing data values can affect the median.
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