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Statistics STA 220 - Test 1 (CHP. 1,2,3,5) Questions and Complete Solutions Graded A+.
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Statistics STA 220 - Test 1 (CHP. 1,2,3,5) Questions and Complete Solutions Graded A+.
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Statistics STA 220 - Test1 (CHP. 1,2,3,5)
Questions and Complete
Solutions Graded A+
Name the two branches of Statistics - Answer: Descriptive
Inferential
Branch of statistics that organizes, summarizes, displaying data; anecdotes cannot be used. - Answer:
Descriptive Statistics
Branch of Statistics that draws conclusions - Answer: Inferential
Objects described by the set of data. Can be people, animals, things. - Answer: Individuals
Characteristics of an individual; can take on different values for different individuals. - Answer: Variable
Is Individuals or Variable LESS intuitive? - Answer: Variable
Another name for Qualitative Variable - Answer: Categorical
(Think: Category)
Variable that places on individual into one or several groups or categories (i.e. small, midsize or large
cars) - Answer: Qualitative/Categorical variable
,Variable that have numerical values for which arithmetical operations make sense (i.e. average distance
between stars). NOT only an average - Answer: Quantitative Variable
Other name for Median. - Answer: Center
Measure of Central Tendency
x with a line above it means: - Answer: Sample Mean
What is a "Mean" - Answer: Add up the numbers and divide by sample size
Mo - Answer: MODE
Define 'Mode" - Answer: Most frequent
Middle number - Answer: Median
What type of rounding is generally used? - Answer: Rount to one digit more than original data
What does an "outlier" do? - Answer: Skews data to the left or right
If outlier is to the left, what happens? - Answer: Pulls mean TOWARDS outlier
mean<median
If outlier is to the left, how is data skewed? - Answer: Skewed to the LEFT
Mean<Median....Where is outlier? - Answer: Skewed to the LEFT
If outlier is to the right, what happens? - Answer: Pulls mean TOWARDS outlier
Mean>Median
, If outlier is to the right, how is data skewed? - Answer: Skewed to the right
Complete group of subjects of interest
(i.e. all persons in US) - Answer: Population
Number that describes a population characteristic
( of total number of persons in US) - Answer: Parameter
Part of population of Interest, a subcollection
(All women in US) - Answer: Sample
Describes a sample characteristic - Answer: Statistic
6 Steps to designing a study - Answer: 1. IDENTIFY variables
2. DEVELOP plan to collect data
3. COLLECT data
4. DESCRIBE date with descriptive statistical techniques
5. INTERPRET data and MAKE Predictions
6. IDENTIFY possible errors.
1. Group within a group that shares similar characteristics
2. Random sample from each group - Answer: Stratified Sample
1. divide population by naturally occurring subgroup
2. Choose SRS (simple random sample) in each of the groups
3. Select a group and all members in it to study - Answer: Cluster Sample
1. Choose a random starting value
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