Chap02b - Solutions to End-of-Section and Chapter Review...

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Solutions to End-of-Section and Chapter Review Problems 135 2.21 (a) Scatter Plot 0 5 10 15 20 25 30 35 0 100 200 300 400 500 Turnover Rate Violations (b) There appears to be a negative relationship between the turnover rate and security violations. 2.22 (a) (b) There does not appear to be any relationship between the battery capacity and the digital-mode talk time. (c) No, the data do not support the expectation that higher battery capacity is associated with higher talk time. Scatter Plot 0.0 1.0 2.0 3.0 4.0 5.0 0 500 1000 1500 2000 Battery Capacity (milliampere-hours) Talk Time (hours)
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136 Chapter 2: Presenting Data in Tables and Charts 2.23 (a) (b) There appears to be a positive relationship between cold-cranking amps and price. (c) Yes, the data seem to support the expectation that higher cranking amps are associated with higher prices. 2.24 (a) Time Series Plot for S&P 0 200 400 600 800 1000 1200 1400 5-Nov-01 25-Dec-01 13-Feb-02 4-Apr-02 24-May-02 13-Jul-02 1-Sep-02 21-Oct-02 10-Dec-02 29-Jan-03 Week (b) There seems to be a general downward trend for the S&P 500 Index from January of 2002 to July 2002. It lost about 20% of its value between January 7, 2002 and July 8, 2002. It fluctuated around 900 points between July 8, 2002 and December 30, 2002. Scatter Plot 0 20 40 60 80 100 120 140 160 0 200 400 600 800 1000 Cold-cranking amps Price ($)
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Solutions to End-of-Section and Chapter Review Problems 137 2.24 (c) cont. Time Series Plot for Sears Stock 0 10 20 30 40 50 60 70 5-Nov-01 25-Dec-01 13-Feb-02 4-Apr-02 24-May-02 13-Jul-02 1-Sep-02 21-Oct-02 10-Dec-02 29-Jan-03 Week Price (d) The prices were rather stable from January 7, 2002 to May 6, 2002. They increased slightly after that till May 28, 2003 and then followed a downward trend from May 28, 2002 to December 30, 2002. (e) Time Series Plot for Target 0 10 20 30 40 50 Week (f) The stock prices of Target Corporation appeared to be on an upward trend from January 7, 2002 to February 19, 2002. There seemed to be a general downward trend afterwards. (g) Time Series Plot for Sara Lee 0 5 10 15 20 25 Week
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138 Chapter 2: Presenting Data in Tables and Charts 2.24 (h) The stock price of SaraLee was rather stable between January 7, 2002 to July 1, 2002. It then lost about 16% of its value in two weeks before starting a general upward trend till December 30, 2002. (i) In general, the S&P 500 index followed a slight downward trend from January 7, 2002 to July 8, 2002 while the stock prices for Target followed similar pattern. The stock prices of both Sears and Sara Lee were rather stable from January 7, 2002 to July 1, 2002. The stock price of Sears then followed a downward trend while the stock prices of Sara Lee had an upward trend. 2.25
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This homework help was uploaded on 04/09/2008 for the course ENGR, STAT 320, 262, taught by Professor Harris during the Spring '08 term at Purdue.

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Chap02b - Solutions to End-of-Section and Chapter Review...

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