{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

week 4 individual

week 4 individual - E-Text Exercises 1 E-Text Exercises...

This preview shows pages 1–3. Sign up to view the full content.

E-Text Exercises 1 E-Text Exercises Fadi Fayad RES/342 03/03/2011 G. Morris Hamm

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 E-Text Exercises 10.30 In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At a = . 01, did the yellow fire trucks have a significantly lower accident rate? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the sample proportions and z test statistic. (d) Make a decision. (e) Find the p-value and interpret it. (f) If statistically significant, do you think the difference is large enough to be important? If so, to whom, and why? (g) Is the normality assumption fulfilled? Explain. Accident Rate for Dallas Trucks Statistic Red Fire Trucks Yellow Fire Trucks Number of accidents x1 = 20 accidents x2 = 4 accidents Number of fire runs n1 = 153,348 runs n2 = 135,035 runs a) H 0 : p 1 = p 2 H a : p
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 6

week 4 individual - E-Text Exercises 1 E-Text Exercises...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online