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COMPUTER SCIENCE What will the following code display? $$ \begin{matrix} \text{dct = {1:[0, 1], 2:[2, 3], 3:[4, 5]}}\\ \text{print(dct[3])}\\ \end{matrix} $$ Verified answer
COMPUTER SCIENCE Write a class declaration named Circle with a private member variable named radius. Write set and get functions to access the radius variable, and a function named getArea that returns the area of the circle. The area is calculated as 3.14159 * radius * radius Verified answer
COMPUTER SCIENCE A compound Boolean expression created with the _________ operator is true if either of its subexpressions is true. a. and b. or c. not d. either Verified answer COMPUTER SCIENCE True/False. An object is an abstraction, meaning that the user doesn't need to know the details of how it works. Verified answer Recommended textbook solutions
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Terms in this set (44)What are the most common graphs for categorical data (nominal and ordinal data)? Pie Chart What are the most common graphs for numerical data (interval or ratio data)? Histogram What are some ways in which a graph can be misleading? Manipulating the Y-axis (ordinate) or Manipulating the x-axis (abscissa) Manipulating the Y-axis (ordinate) Omitting the baseline (not starting at 0) on the y-axis Using the wrong scale Failing to use labels Manipulating the x-axis (abscissa) "Cherry-Picking" data What are the most commonly used graphs for categorical data? bar graph, pareto graph, and pie chart bar graph are a common way to display categorical data and consist of bars that are usually separated from each other. The x-axis usually displays the various categories or levels of the variable of interest, and the y-axis usually displays the frequency, percentage or proportion of each category. However, horizontal bar graphs (x and y swapped) are not uncommon. pareto graph named after Vilfredo Pareto, is a type of bar chart that contains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line. pie chart a type of graph used to display categorical data in which a circle is divided into sectors or slices that each represent a proportion of the whole. Sometimes percent and or frequency are displayed with the slices. What are the most commonly used graphs for numerical data? The most commonly used graphs for displaying numerical data (interval or ratio) are the histogram, time series, box plot, stem and leaf, and frequency polygon. histogram graph a graphical display of data using bars of different heights. It is similar to a bar chart, but a histogram usually groups numbers into ranges and is used to display numerical data rather than categorical data. The bars usually touch one another indicating continuous data, but the lines may be separated to designate discrete data was used. times series graph a line graph of repeated measurements taken over regular time intervals. Time is always shown on the horizontal axis. On time series graphs data points are drawn at regular intervals and the points joined, usually with straight lines. Time series graphs help to show trends or patterns. frequency polygon a type of frequency distribution graph (percentage or relative frequency can also be displayed on the y axis) that can be used to display numerical data. Unlike a histogram, a frequency polygon uses midpoints for each interval rather than the interval itself. A straight line then connects each set of points. The first graph below shows a frequency polygon superimposed over a histogram. stem and leaf display a graphical method of displaying numerical data using the actual data rather than lines or bars. It is particularly useful when your data are not too numerous. A stem and leaf graph is a type table where each data value is split into a "stem" (the first digit or digits) and a "leaf" (usually the last digit). box plot or box and whiskers plot displays a five number summary (Q1, Q2, Q3, IQR and range. It is a very useful graph for examining symmetry and outliers. Misleading graphs not starting at zero on y-axis Not starting at 0 on the y-axis can exaggerate the differences between or among your categories. There are occasions where not starting at 0 is appropriate. Consider the following score diagram. Steam and leaf The stem and leaf plot is useful for small, categorical data sets. false The actual raw data can be reconstructed when using a stem and leaf graph. true The X-axis for a bar chart displays numerical data. false Q1, Q2 and Q3 are displayed in box plot. true The stem and leaf graph displays the actual data as well as the shape of the data. true If the Y-axis on a histogram or bar chart is changed from frequency to relative frequency, the shape of the graph will remain unchanged. true Typically, the Y axis should begin at 0. true The pareto is a type of bar chart where categories are organized from lowest frequency to highest frequency. false The stem and leaf plot is useful for small, numerical data sets. true The histogram is commonly used with categorical data. false Stem and leaf diagrams are like histograms, except that they lose the original scores. false The X-axis for a histogram displays categorical data. false The Y-axis for a pie chart may display frequency, relative frequency or percent.
false The vertical axis, i.e., the Y axis of a graph, is called the abscissa. false A bar graph would be useful for displaying raw scores on a test. false The X-axis for a bar chart displays categorical data. true The X-axis for a histogram displays numerical data. true The box in a box plot represents the IQR. true A bar graph would be useful for displaying the number of students majoring in psychology, nursing or social work. true The stem and leaf plot is useful for very large data sets. false The pie chart is useful for presenting numerical data. false If the right whisker is substantially larger than the left whisker in a box and and whisker plot, the data is likely to be positively skewed. true The primary function of a frequency distribution is organize and manage large sets of data. true A histogram would be useful for displaying the amount of weight patients lost on a diet. true The stem and leaf plot is useful for small, categorical data sets.. false .The box plot or box and whisker plot displays the actual data as well as the shape of the data. false A bar graph would be useful for displaying letter grades on a test true Sets with similar terms
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COMPUTER SCIENCE One way to do multiplication is by repeated addition. For example, $47 \times 25$ can be evaluated as $47 + 47 + 47 + \ldots + 47$ (25 times). Sketch out an algorithm for multiplying two positive numbers a and b using this technique. Verified answer
COMPUTER SCIENCE A positive whole number n > 2 is prime if no number between 2 and $\sqrt{n}$ (inclusive) evenly divides n. Write a program that accepts a value of n as input and determines if the value is prime. If n is not prime, your program should quit as soon as it finds a value that evenly divides n. Verified answer
COMPUTER SCIENCE How many binary digits would it take to represent the following phrase in ASCII code? In 16-bit Unicode? (Do not include the “ ” marks.) “Invitation to Computer Science" Verified answer
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What is a graphical display of data using bars of different heights quizlet?A histogram is a bar graph in which the horizontal scale represents classes of data values and the vertical scale represents frequencies. The heights of the bars correspond to the frequency values, and the bars are drawn adjacent to each other (without gaps).
What is a graphical display of data using bars?A bar graph is a graphical representation of information. It uses bars that extend to different heights to depict value. Bar graphs can be created with vertical bars, horizontal bars, grouped bars (multiple bars that compare values in a category), or stacked bars (bars containing multiple types of information).
What type of graph is used for scale data?Bar charts and pie charts are most frequently used for nominal and ordinal variables. Scale variables are most frequently represented by line charts and histograms.
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What is a graphical display of data using bars of different heights that groups numbers into ranges quizlet?
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