Iqr - Study guides, Class notes & Summaries
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AP Stats Exam Review - Stats Medic Questions With Complete Solutions
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How to describe a 1-variable distribution correct answer: SOCS + context 
 
Ways to describe the shape of a distribution (S) correct answer: Symmetric = balanced on both sides of the center 
 
Skewed right = tail (part with less stuff) is located to the right of the center 
 
Skewed left = tail is located to the left of the center 
 
When describing this part of a distribution, always use -ly words in your description (fairly, slightly, strongly, appropriately, etc.) 
 
Outlier Formula (3rd Qu...
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Statistics Key PASSED Exam Questions and CORRECT Answers
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How do you check if there is outliers?calculate IQR; anything above Q3+1.5(IQR) or 
below Q1-1.5(IQR) is an outlier 
If a graph is skewed, should we calculate the median or the mean? Why?median; it is 
resistant to skews and outliers 
If a graph is roughly symmetrical, should we calculate the median or the mean? 
Why?mean; generally is more accurate if the data has no outliers 
What is in the five number summary?Minimum, Q1, Median, Q3, Maximum 
Relationship between variance and standard devia...
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AP Statistics Exam Review Questions And Answers
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To describe categorical data... correct answer: Make a picture. Bar graphs or pie charts work well. 
Summarize the distribution with a table of counts or relative frequencies (percents) in each category. 
Compare distributions with plots side by side. 
 
Interpret Standard Deviation correct answer: Standard deviation measures spread by giving the "typical" or "average" distance that the observations (context) are away from their (context) mean. 
 
Outlier Rule correct answer: Upper Bound ...
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YESHIVA UNIVERSITY ISDS 361A FINAL EXAM 2024 WITH 100% CORRECT ANSWERS
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YESHIVA UNIVERSITY ISDS 361A FINAL EXAM 2024 WITH 100% CORRECT ANSWERS 
 
 
The collection of all units of interest in a particular study is called 
a. Sample 
b. Parameter 
c. Population 
d. Statistic - correct answer Population 
 
Suppose there is a dataset of baseball scores from several matches between the Seattle Mariners and 
Anaheim Angels. A statistician wants to summarize the data using graphical and numerical measures. 
What branch of Statistics will she need to use? 
a. Descriptive St...
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Straighterline Introduction to Statistics Questions and Answers Already Passed
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Straighterline Introduction to Statistics 
Questions and Answers Already Passed 
 
Four steps in the process of statistics 1. Producing Data 
2. Exploratory Data Analysis 
3. Probability 
4. Inference 
 
Categorical variable places individuals into one of several groups 
Two types: nominal and ordinal 
 
Quantitative Variable represents a measurement or a count 
Two types: Interval and ratio 
 
Nominal Variable categorical variables where there is no natural order among the categories 
 
Ordinal...
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AP Statistics Final Review (S1) Questions With Complete Solutions
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Is mean resistant to outliers? correct answer: No, non-resistant 
 
Is median resistant to outliers? correct answer: Yes, resistant 
 
Is standard deviation resistant to outliers? correct answer: No, non-resistant 
 
What is included in the 5-number summary? correct answer: min, Q1, med, Q3, max 
 
IQR equation correct answer: IQR = Q3 - Q1 
 
Which point divides the area under the density curve in half? correct answer: median 
 
Which point is the balance point of the density curve? corre...
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C207 Already Passed Exam Questions and CORRECT Answers
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1. Which of the following statistics are unaffected by a single large outlier? (More than one) * 
Median, mode, Interquartile range (IQR) 
2. Which of the following is most suitable for policy making based on income distribution? * 
Median 
Because of assumed skewed distribution 
3. If we study data from a population whose mean is 200 and standard deviation is 30, which 
of the following data points has a z-score of -3? * 110. 
4. Which of the following statistics measures the spread of the d...
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UGBA 104 M1 2023 Correct Questions & Answers(Rated A+)
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calculate outliers IQR method - ANSWER IQR below; Q1 - 1.5 * IQR 
IQR above; Q3 + 1.5 * IQR 
 
how to calculate percentiles - ANSWER percentile (L) = (n+1) * P/100 
 
calculate z score outlier - ANSWER (value-mean)/SD 
 
rule of thumb for z score outlier - ANSWER above or below 3 SDs away 
 
which outlier method is more lenient - ANSWER z score, it goes further from mean than the IQR method 
ie the IQR gives a z score less than 3 
 
cross tabulation - ANSWER a table or matrix that shows the rela...
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UGBA 104 Midterm Exam Questions and Answers 100% Verified
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UGBA 104 Midterm Exam Questions and 
Answers 100% Verified 
calculate outliers IQR method - CORRECT ANSWER-IQR below; Q1 - 1.5 * IQR 
IQR above; Q3 + 1.5 * IQR 
how to calculate percentiles - CORRECT ANSWER-percentile (L) = (n+1) * P/100 
calculate z score outlier - CORRECT ANSWER-(value-mean)/SD 
rule of thumb for z score outlier - CORRECT ANSWER-above or below 3 SDs away 
which outlier method is more lenient - CORRECT ANSWER-z score, it goes further from 
mean than the IQR method 
ie the IQR...
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Green Packet MC Questions and Answers Already Passed
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Green Packet MC Questions and 
Answers Already Passed 
 
Of the following dotplots, which represents the set of data that has the greatest standard 
deviation? B 
 
split in half 
 
A random sample of 374 United States pennies was collected, and the age of each penny was 
determined. According to the boxplot below, what is the approximate interquartile range (IQR) 
of the ages? 
graph 
 
A 
8 
 
B 
10 
 
C 
16 
 
D 
40 
 
E 
 
50 C 
 
16 
 
graph 
 
The histogram above shows the number of minute...
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