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Handout Chapter 8

Handout Chapter 8 - ratings on cars and appliances’ 54...

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Handout Chapter 8 1.A commercial refrigerator specification calls for an average temperature of 8 degrees Celsius. You have been asked to conduct a study to estimate the population mean for a commercial refrigerator. To do this, you have selected a random sample of 7 days and the observed temperatures recorded as follow: 5, -2, 15, 6, -5, 0, 10. At the 0.05 level of significance, can you conclude that the specification for average temperature is met? Variable N Mean StDev SE Mean 95% CI C1 7 4.14286 7.01020 2.64961 (-2.34049, 10.62621) 447 . 2 456 . 1 7 01 . 7 8 143 . 4 01 . 7 143 . 4 447 . 2 447 . 2 8 : 8 : 2 0 2 2 0 - = - = - = - = = = - = < = = α α α μ μ μ t n S Y t S Y H reject t t or t t if H H a Do not reject H
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Unformatted text preview: ratings on cars and appliances’ 54 responded yes. a. At the 0.05 level of significance, can you prove that the percentage of people who trust energy-efficiency ratings on cars and appliances’ to be less than 50%. b. Determine the p-value for part a. 5 . : 5 . : 45 . 120 54 < ≥ = = = ∧ π A H H n Y 096 . 1 120 ) 5 . 1 ( 5 . 5 . 45 . ) 1 (-=--=--= ∧ n Z 645 . 1 096 . 1-=-= α Z Z do not Reject H 0 Z=0 645 . 1-= Z 05 . = Z=0 0.3621 Z=-1.09 1379 . = PV...
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