# Dummy Definitions

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 Author: RocketRN ID: 230006 Filename: Dummy Definitions Updated: 2013-08-18 14:45:35 Tags: Definitions Folders: Description: Dummy definitions Show Answers:

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1. Response Rate
The number of respondents  divided by the number of surveys sent out.
2. Scientific Method
Asking questions, doing studies, collecting evidence, analyzing the evidence, and making conclusions
3. Population
The group of individuals that you wish to study in order to answer your research question
4. Sample
Select a small number of individuals from the population, study those individuals, and use that information to draw conclusions about the whole population.
5. Random Sample
Gives every member of the population an equal chance of being selected, and it uses some mechanism of chance to choose them.
6. Bias
A systematic favoritism that is present in the data collection process, resulting in lopsided misleading results

• - In the way the sample is selected
• - in the way the data are collected
7. Data
The actual measurements that you get through your study {Singular is datum}

• - Numerical Data
• - Categorical Data {Qualitative Data}
8. Statistic
A number that summarizes the datta collected from a sample
9. Census
Collect data from the entire population
10. Parameter
The number from the summary of all the census information
11. Mean
The sum of all numbers divided by te total number of numbers

{Average}
12. Median
The center of a numerical data set. The point at which there are equal number of data points whose values lie above and blow the median value
13. Standard Deviation
A measurement of the variability {or spread} among the numbers in a data set.

A standard {typical} amount of deviation {distance} from the average {or mean}.

The average distance from the mean

• n = number of values in dataset
•  = the average of all the values
• x = each value in the data set
14. Empirical Rule
95% of the data will fall within 2 standard deviations of the mean
15. Percentile
The percentage of values in the data set that fall below that certain score.

90th percentile means 90% of the people scored lower than you did
16. Ratio
A fraction that divides two quantities

300 girls and 200 boys is a ratio of 3:2
17. Rate
A ratio that reflects some quantity per a certain unit

• a car goes 60 miles per hour
• burglary rate is 3 per 1,000 homes
18. Percentatge
A number between 0 and 100 that reflects a portion of the whole
19. Percent increase
increase from 50 to 60

• (60 - 50)÷50
• 10÷50 = 0.20 or 20%
20. Percent of whole
• The #1 comes up 468 times out of 4,839
• The #2 comes up 513 times out of 4,839

The difference in the number of times each number is drawn:

• 513-468= 45
• 45÷4,839= 0.009 { of 1%}
21. Relative  Standing
How an individual data value compares to the rest of the group.

Determined by percentiles
22. Standard Score
The number of standard deviations above or below the mean {without caring what the standard deviation or mean actually are}

The answer is expressed as "score is 1 standard deviation below the mean" "Score is 2 standard deviations above the mean"

Standard Score =

•  = mean
•  = Standard deviation
23. Probablility of an Outcome
The percentage of times tat the outcome is expected to happen.

The number of ways that the outcome can happen ÷  the total number of possible outcomes.

Rolling a 1 on a dice = 1 out of 6 or 16.7%
24. Central Limit Theorem
The distribution of all sample means (or proportions) is normal as long as the sample sizes are large enough
25. Sample Error
Measures the variability of a sample means

Sample error = Standard Deviation
26. Sampling Distribution
A listing of all the values that a sample mean can take on and how often those values can occur
27. Margin of Error
• The number of standard errors added or subtracted
•

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