
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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- 26. How can you describe the spread of data using a box-and-whisker plot?arrow_forwardExplain how error measures can help to optimize moving averages, weighted moving averages, and exponential smoothing methods.arrow_forwardSome data sets include values so high or so low that they seem to stand apart from the rest of the data. These data are called outliers. Outliers may represent data collection errors, data entry errors, or simply valid but unusual data values. It is important to identify outliers in the data set and examine the outliers carefully to determine if they are in error. One way to detect outliers is to use a box-and-whisker plot. Data values that fall beyond the limits Lower limit: Q1 − 1.5 ✕ (IQR)Upper limit: Q3 + 1.5 ✕ (IQR) where IQR is the interquartile range, are suspected outliers. In the computer software package Minitab, values beyond these limits are plotted with asterisks (*). Students from a statistics class were asked to record their heights in inches. The heights (as recorded) were as follows. 65 72 68 64 60 55 73 71 52 63 61 74 69 67 74 50 4 75 67 62 66 80 64 65 (a) Find the value of the interquartile range (IQR).IQR = (b) Multiply the IQR by 1.5 and find the lower…arrow_forward
- For a box plot, here are 4 values at the low end of a dataset and 4 values near the high end of a set of dataset: 18, 18, 18, 18 … 23, 23, 25, 25, … If the lower fence or boundary for outlier determination is 16 and the upper fence or boundary is 24, what value would you connect the whisker to on the high side of the “box?”arrow_forwardWhat does the "box" of a box-and-whisker plot encompass? Outliers None of these Minimum and maximum Q1, Q2, Q3arrow_forwardDetermine the direction, form, strength, and any outliers on the scatter plot. This scatter plot has a negative association, form is linear, strength is weak, and there are no apparent outliers. This scatter plot has a negative association, form is nonlinear, strength is weak, and there is one possible outlier. This scatter plot has a positive association, form is linear, strength is weak, and there is one possible outlier. This scatter plot has a positive association, form is linear, strength is strong, and there are no apparent outliers.arrow_forward
- Is the mean, median, or mode most sensitive to the presence of outliers?arrow_forwardThe interquartile range is more susceptible to outliers in the data than is the range A. True B. Falsearrow_forwardA set includes the following five numbers: 20,19,50,18,16 which data measure decreases when the outlier is not included in the calculationsarrow_forward
- For a box plot, here are 4 values at the low end of a dataset and 4 values near the high end of a set of dataset: 18, 18, 18, 18 ... 23, 23, 25, 25, ... If the lower fence or boundary for outlier determination is 16 and the upper fence or boundary is 24, what value would you connect the whisker to on the high side of the "box?"arrow_forwardDescribe the natures of the two distributions (uniform, normal, skewed left, skewed right), and identify possible outliers.arrow_forwardChoose a correct statement. Leverage means a gap between a data point that is unusual in OLS models. O Discrepancy means how far away an observation is from other observations. c. Cook's distance measures discrepancy. Influential outliers can be calculated by discrepancy X leverage. O Cook's distance measures discrepancy.arrow_forward
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