Share AS Stats Quiz #4
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A scatter plot is useful for identifying relationships between two variables
True – It helps visualize correlations and trends.
A bar chart can be used to represent grouped continuous data
False – Bar charts are for categorical or discrete data, not grouped continuous data.
The frequency of a class interval must be a whole number
True – Frequency counts how many times something occurs.
Deciles divide data into ten equal parts
True – Deciles split data into ten groups.
The cumulative frequency of the final class equals the total frequency
True – Cumulative frequency sums to the total.
When all data values are the same, the standard deviation is 0
True – No variation means zero spread.
In systematic sampling, the first item is chosen randomly
True – This ensures randomness in the starting point.
A data set with zero variance must contain all distinct values
False – Zero variance means all values are the same.
In a line graph, the x-axis usually represents time
True – Line graphs often show trends over time.
The median is affected by extreme values
False – It is resistant to outliers.
The probability of all mutually exclusive outcomes of an experiment sums to 1
True – That’s a fundamental rule of probability.
The third quartile is always larger than the second quartile
True – Q3 > Q2 (the median) by definition.
Stratified sampling requires random sampling within each stratum
True – Each subgroup is sampled randomly.
In a positively skewed distribution, the mean is greater than the median
True – The long tail pulls the mean to the right.
All bar chart bars must touch each other
False – In bar charts, bars are separated. touching bars are for histograms.
The mode can be found for both numerical and categorical data
True – It applies to both.
