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In testing eight value notebook computers, PC World reported various physical and performance mea- sures of each. Data included overall rating, street price, PC WorldBench 4 performance score, and battery life,
Computer: 5 6 7 8
Overall Rating:
75
74
72
Street Price:
1857
1865
1699
1298
Performance Score:
100
98
104
91
Battery Life (hours):
1.88
3.00
2.38
2.33
a. From these data, obtain the multiple regression equa- tion estimating overall rating on the basis of the other three variables; then determine and interpret the approximate 95% confidence interval for the mean overall rating of notebook computers having a 1000 street price, a performance score of 100, and a 2.50-hour battery life.
b. Determine the 95% prediction interval for the overall rating of an individual notebook computer with a $1000 street price, a performance score of 100, and a 2.50-hour battery life.
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