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Exhibit 16-4

Question 58
Multiple Choice

Exhibit 16-4.The following data shows the cooling temperatures of a freshly brewed cup of coffee after it is poured from the brewing pot into a serving cup.The brewing pot temperature is approximately 180º F;see http://mathbits.com/mathbits/tisection/statistics2/exponential.htm img For the assumed exponential model ln(Temp)= β0 + β1Time + ε,the following Excel regression partial output is available. img img Refer to Exhibit 16-4.What is the percentage of variations in ln(Temp)explained by Time? A)45.48% B)97.01% C)1.40% D)46.88%

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Q 59
Exhibit 16-4.The following data shows the cooling temperatures of a freshly brewed cup of coffee after it is poured from the brewing pot into a serving cup.The brewing pot temperature is approximately 180º F;see http://mathbits.com/mathbits/tisection/statistics2/exponential.htm For the assumed exponential model ln(Temp)= β0 + β1Time + ε,the following Excel regression partial output is available. Refer to Exhibit 16-4.What is the sample correlation coefficient between ln(Temp)and Time? A)-0.9701 B)0.9701 C)-0.9849 D)0.9849
Q 60
Exhibit 16-4.The following data shows the cooling temperatures of a freshly brewed cup of coffee after it is poured from the brewing pot into a serving cup.The brewing pot temperature is approximately 180º F;see http://mathbits.com/mathbits/tisection/statistics2/exponential.htm For the assumed exponential model ln(Temp)= β0 + β1Time + ε,the following Excel regression partial output is available. Refer to Exhibit 16-4.What is the standard error of the estimate? A)0.03421 B)0.45476 C)0.00177 D)0.67436
Q 61
Exhibit 16-4.The following data shows the cooling temperatures of a freshly brewed cup of coffee after it is poured from the brewing pot into a serving cup.The brewing pot temperature is approximately 180º F;see http://mathbits.com/mathbits/tisection/statistics2/exponential.htm For the assumed exponential model ln(Temp)= β0 + β1Time + ε,the following Excel regression partial output is available. Refer to Exhibit 16-4.What is the regression equation for making predictions concerning the coffee temperature? A) B) C) D)
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