Iqr - Study guides, Class notes & Summaries

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...

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...

D467 Exploring Data Questions and Answers Already Passed What is the purpose of data exploration in data analysis? Data exploration aims to summarize the main characteristics of a dataset, often using visual methods to uncover patterns, trends, and anomalies. What is the difference between qualitative and quantitative data? Qualitative data describes categorical variables and characteristics, while quantitative data represents numerical values that can be measured and analyzed sta...

Pie chart numerical measure: percentages best used When displaying categories as parts of the whole Bar chart (bar graph) Category counts or frequencies best used when displaying counts or frequencies for each category individually Dot Plot 5-number summary (max, Q1, median, Q3, max) Smaller data set; useful to display the distribution and show gaps and outliers (quantitative) Stem Plot (stem-and-leaf plot) 5-number summary (max, Q1, median, Q3, max) Smaller data sets; useful to disp...

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...

Straighterline Introduction to Statistics exam questions and answers used to find events of the type events of the type "A or B" General Multiplication Rule - Answer-P(A and B) = P(A) * P(B | A) Used for events of the type "A and B" or when A and B are independent: P(A and B) = P(A) * P(B) Conditional probability P(B | A) - Answer-the conditional probability of event B occurring given that event A has occurred P(B | A) = P(A and B) / P(A). Methods for checking for indepe...

Is a quantitative variable always measured in numbers? - Answer-Yes Is any measurement that you record from a sample a variable? - Answer-False What is a statistic? - Answer-The measure that is taken from the whole sample as a summary of the sample Sample data skewed to the left, then longer tail is at the... - Answer-Left What is sensitive to outliers? - Answer-Median Formula to calculate standard deviation - Answer-s = sqrt(sum(x1-xbar)^2 / n-1) How to calculate degrees of fr...

null hypothesis (H0) - the statistical hypothesis tested by the statistical procedure; usually a hypothesis of no difference or no relationship Interquartile Range (IQR) - the difference between the first and third quartiles (middle 50% of observations) dichotomous measure - describes the presence or absence of an attribute (ex smoker/nonsmoker) nominal data - categories that vary with no natural order (ex blood types) ordinal data - categories with natural order but without clear units (e...

Boxplot an image that has min, Q1, median, Q3, max Histogram A graphical representation -- bars, measuring the frequency within each interval Skewed right Not a symmetric distribution, the tail is on the right, i.e. extra stuff on the right Measures of center Median, the mean (and mode) Measures of spread Range, IQR & standard deviation Standard Deviation Rule 68% of the data are within 1 standard deviation, 95% are within 2, 99.7 are within 3 standard deviations from the mean. For skewed...

Categorical Data correct answer: Assigns a unique value for each case, used to name or identify it Quantitative Data correct answer: A variable in which the numbers act as a numerical value, always have units Stem and leaf plot correct answer: Shows quantitative data values in a way that sketches the distribution of the data Ogive correct answer: a graph that represents the cumulative frequencies for the classes in a frequency distribution Histogram correct answer: Bar graphing ...