Statistics
What is Statistics?
process of collection of data, classifying data, representing the data for easy interpretation, and further analysis of data
How do we get the number of classes?
2k rule such that 2k > number of observations (n)
Define Margin of error (e)
Margin of error is the value which quantifies possible sampling error.
Mean Median or Mode:
Middle Value or Middle term
Median
How does systematic sampling work?
Each member of the population is assigned a number. The members of the population are ordered in some way, a starting number is randomly selected, and then sample members are selected at regular intervals from the starting number.
Descriptive or inferential:
You’ve performed a survey with 40 respondents about their favorite car color. And now you have a spreadsheet with the results.
Descriptive Statistics
What is the total number of observations?
40
What is the formula used in computing sample size?
n = N/1+Ne2
Mean Median or Mode:
Most frequent
Mode
When creating a frequency table, How to get the class interval?
Range/number of classes or R/k
True of false:
Height is a constant data.
False. It is a variable.
Which class interval has the highest frequency?
Third class, 41-45
What happen if you did not calculate sample size?
It can lead to results being missed, biased or just plain incorrect. It can also result in rendering a study unethical, unpublishable, or both.
Complete the sentence: A very small or very large value can affect the mean. These extreme values are called _ _ _ _ _ _ _ _.
Outliers
Class Limits
Class Boundaries
Frequency
Relative Frequency
Cumulative Frequency
Midpoint
In statistics, variables can be categorized as __________ and __________.
Quantitative and Qualitative
What is the lower limit of the fourth class interval?
46
How to use Lottery sampling selecting?
Getting samples using random numbers.
Find the median of the given grouped data
8.25 or 8.3
Give one example of each scale of measurement.
What is the difference between continuous and discrete variables?
A continuous variable is measured along a continuum while a discrete variable, is measured in whole units or categories.
What is the class size of each class interval?
5
The total number of businesses registered in a certain city is 2,000. Use e = 5%
334
Find the mode of the given grouped data.
14.8 or 14.83
How to get a sample using stratified sampling?
1. Apply Yamane’s formula to get the sample size.
2. To determine the sample size in each subgroup multiply the suggested sample size by each proportion.