Chi square: Is the cockpit noise level independent of flight
Not what you're looking for?
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter. Noise level is defined as "Low" (under 88 decibels), "Medium" (88 to 91 decibels), or "High" (92 decibels or more). There are three flight phases (Climb, Cruise, Descent). Research question: At α = .05, is the cockpit noise level independent of flight phase? (Data are from Capt. Robert E. Hartl, retired.)
Noise Level Climb Cruise Descent Row Total
Low 6 2 6 14
Medium 18 3 8 29
High 1 3 14 18
Col Total 25 8 28 61
Can you please post their outputs here to support your calculations.
1. State the hypotheses.
2. Show how the degrees of freedom are calculated.
3. Find the critical value of chi square from Appendix E or from Excel's function =CHIINV(alpha, deg_freedom).
4. Compute the value of the chi square test statistic.
5. Compute and interpret the p-value. If necessary, you can calculate the p-value by using Excel's function =CHIDIST(test statistic,deg_freedom).
6. Answer the research question.
7. Tell whether this conclusion is sensitive to the level of significance chosen.
8. Identify cells that contribute the most to the chi-square test statistic.
9. Check for small expected frequencies.
Purchase this Solution
Solution Summary
A Complete, Neat and Step-by-step Solution is provided in the attached file.
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.