1. Which of the following measures the spread of data?
- Mean
- Median and interquartile range
- First and third quartiles
- Standard deviation and variance
Answer
Answer: (4) Standard deviation and variance
2. The middle value in a set of observed values is:
- Mode
- Range
- Median
- Mean
Answer and Explanation
Answer: (3) Median
Explanation:
-> Mode represents the value that appears most frequently in a data set.
-> Range is the difference between the highest and lowest values in a group interval.
-> Mean is the average or the most value in a collection of numbers.
3. The simplest measurement of central tendency is:
- Mean
- Median
- Mode
- Standard deviation
Answer and Explanation
Answer: (1) Mean
Explanation:
-> Mode represents the value that appears most frequently in a data set.
-> Range is the difference between the highest and lowest values in a group intervals.
-> Mean is the average or the most value in a collection of numbers.
4. To identify the shape of univariate data, what type of graph would be the most useful?
- Histogram
- Scatter plot
- Bar chart
- Pie chart
Answer and Explanation
Answer: (1) Histogram
Explanation:
-> Bar graph: shows the number in categories
-> Scatter plot: to determine whether or not two variables have a relationship or correlation.
-> Pie chart: compare parts of the data to the whole
5. Sample surveys are types of
- Secondary data
- Tertiary data
- Manipulated data
- Primary data
Answer and Explanation
Answer: (4) Primary data
Explanation:
-> Primary data: data collected by researchers directly from main sources. Eg: interviews, surveys, experiments, etc.
-> Secondary data: data that is collected by someone other than the primary user. Eg: censuses, information collected by government departments, organizational records, etc.
-> Tertiary data: based on a collection of primary and secondary sources. Eg: textbooks, manuals, encyclopedias, etc.
6. The degree of freedom can be calculated using the formula
- (n-2)
- (n+1)
- (n-1/2)
- (n-1)
Answer and Explanation
Answer: (4) (n-1)
Explanation: Degree of freedom is given by df= N-1; where n represents the sample size.