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2-3 example5 - Student Grady Simonton Instructor Shawn...

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Unformatted text preview: Student: Grady Simonton Instructor: Shawn Parvini Date: 2/18/10 Course: Math119: Elementary Statistics - Spring 2.010 - CRN: 49239 - 16 weeks Book: Triola: Elementary Statistics, 11e Time: 11:06 ANI The table below shows the frequency distribution of home voltage measurements taken on 50 consecutive days. Use the frequency distribution to construct a histogram. Does the result appear to be a normal distribution? Home Voltage Class Frequency 123.3— 123.4 12 123.5— 123.6 11 123.7— 124.8 13 123.9— 124.0 12 124.1 — 124.2 2 A histogram is a graph consisting of bars of equal width drawn adjacent to each other (without gaps). The horizontal scale represents classes of quantitative data values and the vertical scale represents frequencies. The heights of the bars correspond to the frequency values. Use the given frequency distribution to construct the histogram. The correct graph is shown below. 20— _L ‘t‘ Frequency 3 U1 0 123.75 X Values 123.35 124.15 When graphed, a normal distribution has a "bell" shape. One characteristic of the bell shape is that the frequencies increase to a maximum and then decrease. Another characteristic is symmetry, with the left half of the graph roughly a mirror image of the right half. Examine the histogram. N ‘P _\ U1 I 0 Frequency 001 123.75 124.15 K Values 123.35 The histogram is not approximately symmetric because the far left side of the histogram is high, at 12, while the far right of the histogram is low, at 2. There is no obvious maximum. Use this information to determine if the frequency distribution appears to be normal. Page 1 ...
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