# Statistics Chapter 1,2,3,4

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1. The two major types of statistics are ______ statistics and _____ statistics.
Inferential, Descriptive
2. What is the difference in the conclusion drawn from a designed experiment an observational study?
Oberservational can only reveal association, where designed experiments can show causation
• Advantages: Easier, faster, less expensive
• Disadvantage: cluster sampling is not that accurate, each cluster will probably not be the same as the other clusters
4. Age Percentage not covered
18-24 28.2
25-39 24.9
40-54 19.1
55-65 16.5
Classify the study as either descriptive or inferential
Inferential
5. Define Observational Study
researchers observe characteristics and take measurements
6. Define Designed experiment
researchers impose treatments and controls
7. Descriptive Statistics
consists of methods for organizing and summarizing information
8. inferential statistics
consists of methods for drawing and measuring the reliability of conclusions about a population based on info obtained from a sample of the population
9. Contingency table represent what specific kind of discrete data
bivariate data
10. what is the equation for Chebyshev's Rule
100(1-(1/k2) %
11. How many data points are you trimming off for 20 data points with a 10% trimmed mean?
4 in total...2 on top and 2 on the bottom
12. Qualitative variable
nonnumerical variable
13. Quantitative variable
numerical variable
14. variable
characteristic that varies from one person or thing to another
15. data
values of a variable
16. qualitative data
values of a qualitative variable
17. quantitative data
values of a quantitative variable
18. discrete variable
quantitative variable whose possible values can be listed
19. continuous variable
quantitative variable whose possible values form some interval of numbers
20. a table that provides the classes, frequencies, relative frequencies, and midpoints of a data is called a _______
grouped-data table
21. A positive Z score indicates that the observation is ______ the mean, whereas a negative Z score indicates that the observation is _____ the mean.
above, below
22. A standardized variable always has mean ____ and standard deviation ____
0, 1
23. interpret this z score.

Z = 10.16 - 3.00 = 2.24
3.20
the data 10.16 is 2.24 standard deviation above the mean of 3.00
24. difference between a parameter and a statistic
a parameter is a measure of the population and a statistic is a measure of a sample
25. mutually exclusive events
no two of them have outcomes in common
 Author: trulyfe89 ID: 36331 Card Set: Statistics Chapter 1,2,3,4 Updated: 2010-09-21 19:16:47 Tags: Math Folders: Description: Math exam 1 Show Answers: