Question

The compact car market in the United States is extremely competitive. Data has been collected on sales for six of the top models for six months in 2011. It is also believed that the level of sale often varies a great deal across different months of the year. At the 0.05 level of significance, test for any significant difference in the mean number of cars sold per month for the six models (Hint: Use a randomized block design with no interaction). Explain your results briefly. (Using Minitab)

Month |
Chevy Cruze |
Ford Focus |
Hyundai Elantra |
Honda Civic |
Toyota Corolla |
VW Jetta |

May | 22711 | 22303 | 20006 | 18341 | 16985 | 16671 |

Jun | 24896 | 21385 | 19992 | 18872 | 17485 | 17105 |

Jul | 24468 | 17577 | 15713 | 15181 | 14889 | 14006 |

Aug | 21897 | 16420 | 15054 | 14500 | 14093 | 12083 |

Sep | 18097 | 16147 | 15023 | 14386 | 13724 | 10309 |

Oct | 16244 | 16173 | 14295 | 13058 | 13000 | 12386 |

Answer #1

Based on sales over a six-month period, the five top-selling
compact cars are Chevy Cruze, Ford Focus, Hyundai Elantra, Honda
Civic, and Toyota Corolla.† Based on total sales, the market shares
for these five compact cars were Chevy Cruze 24%, Ford Focus 21%,
Hyundai Elantra 20%, Honda Civic 18%, and Toyota Corolla 17%.
Suppose a sample of 400 compact car sales in one city showed the
following number of vehicles sold.
Chevy Cruze
109
Ford Focus
92
Hyundai Elantra
65...

Based on sales over a six-month period, the five top-selling
compact cars are Chevy Cruze, Ford Focus, Hyundai Elantra, Honda
Civic, and Toyota Corolla.† Based on total sales, the market shares
for these five compact cars were Chevy Cruze 24%, Ford Focus 21%,
Hyundai Elantra 20%, Honda Civic 18%, and Toyota Corolla 17%.
Suppose a sample of 400 compact car sales in one city showed the
following number of vehicles sold.
Chevy Cruze
108
Ford Focus
92
Hyundai Elantra
65...

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