Prepare answers to the following assignments from the e-text, _Applied Statistics in Business and Economics_, by Doane and Seward: Chapter 15 - Chapter Exercises 15.18, 15.22, 15.24, and 15.28 15.18 SIXTY-FOUR STUDENTS IN AN INTRODUCTORY COLLEGE ECONOMICS CLASS WERE ASKED HOW MANY CREDITS THEY HAD EARNED IN COLLEGE, AND HOW CERTAIN THEY WERE ABOUT THEIR CHOICE OF MAJOR. RESEARCH QUESTION: AT Α = .01, IS THE DEGREE OF CERTAINTY INDEPENDENT OF CREDITS EARNED? CREDITS EARNED VERY UNCERTAIN SOMEWHAT CERTAIN VERY CERTAIN ROW TOTAL 0-9 12 8 3 23 10-59 8 4 10 22 60 OR MORE 1 7 11 19 COL TOTAL 21 19 24 64 H0: The two factors are independent HA: There is a relationship between the two factors. Level of Significance: = 1% Decision …show more content…
15.24 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 H0 = The noise level is independent of the phase of flight H1 = The noise level is dependent on the phase of flight Recorded Values: Climb Cruise Descent Total Low 6 2 6 14 Medium 18 3 8 29 High 1 3 14 18 Total 25 8 28 61 Expected values: [Example: Expected value for the Low-Climb category is calculated as (Low Total * Climb Total / Grand Total) = (14 * 25)/61 = 5.74] Climb Cruise Descent Low 5.74 1.84 6.43 Medium 11.89 3.80 13.31 High 7.38 2.36 8.26 Chi Squares Table: Recorded Value (R) Expected Value (E) (R - E)^2 (R - E)^2 /E 6 5.74 0.069 0.012 18 11.89 37.390 3.146 1 7.38 40.667 5.513 2 1.84 0.0269 0.015 3 3.80 0.645 0.170 3 2.36 0.409 0.173 6 6.43
Due to financial hardship, the Nyke shoe company feels they only need to make one size of shoes, regardless of gender or height. They have collected data on gender, shoe size, and height and have asked you to tell them if they can change their business model to include only one size of shoes – regardless of height or gender of the wearer. In no more 5-10 pages (including figures), explain your recommendations, using statistical evidence to support your findings. The data found are below:
Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Test Resources link.
• Provide at least two examples or problem situations in which statistics was used or could be used.
2.) Answer the following questions based on a reading of the above document and material from your textbook.
Short Answer Writing Assignment – Both the calculated binomial probabilities and the descriptive statistics from the class database will be used to answer the following questions.
The t-test is a parametric analysis technique used to determine significant differences between the scores obtained from two groups. The t-test uses the standard deviation to estimate the standard error of the sampling distribution and examines the differences between the means of the two groups. Since the t-test is considered fairly easy to calculate, researchers often use it in determining differences between two groups. When interpreting the results of t-tests, the larger the calculated t ratio, in absolute value, the greater the difference between the two groups. The significance of a t ratio can be determined by comparison with the critical values in a
You are all interested in something. Explore the literature (magazines, books, web sites, etc) for your interest area and find an example of the use of graphical statistics. I suggest a Google search using the Images option, and select some interesting and visual display of data. Identify the related materials that support the graphic and containing some form of statistical analysis and/or display. Review your materials using the framework offered below.
In order to receive full credit on calculated answers, please show your work. (Use Word's equation editors, etc., and/or provide a short written description as to how you obtained the final result.)
I believe that in the verge of realization, in everyday life’s undertaking we are facing and practicing statistics. I was being into a serious dedication of understanding the underlined concepts of statistics and the necessary usefulness in conducting a survey. In fact, throughout the course, I did learn many factors that became useful in contacting a survey research. according to Walker et al. (2011). However, my success could not be possible without the appreciation and support of my teachers, discussion groups, and class presentations.in addition, the misguided notion of statistics being a tough course was proven otherwise since I realized that statistics make a lot of sense not only in survey research in personal life, especially in budgeting and planning for individual routines. Furthermore, the following paper provides a vivid explanation of my reflection of the survey class, with more attention paid to the concepts of statistics.
Let’s use what you learned not only earlier in the class but also information from Module 7 for this assignment. Answer the following questions using your newfound knowledge about applying bivariate statistics and their p values to published results. Make sure you answer all parts of the question to get full credit.
Sierra Paul ENG-112 Popular Science Due Feb 11 According to Inlet hearing and center, Hearing loss is a common problem caused by noise, aging, disease, and heredity. Hearing is a complex sense involving both the ear's ability to detect sounds and the brain's ability to interpret those sounds. Approximately 36 million American adult have some degree or form of hearing loss.
5.000,00 $ 7.500 151.250 20 35.000,00 $ 12.500 321.250 26 $ 58,20 $ 110.000,00 4.000 333.500 83 115,38
Major League Baseball is known as America’s favorite pastime, and MLB teams spend an extensive amount of money in the excess of a billion dollars with the ultimate goal to win the World Series. This learning team’s focus throughout this descriptive statistics paper is the MLB players’ performances, salaries, salary caps, and winning percentages. Though salaries will by no means be a trade for wins, the goal is to use the less experienced players and pay them a lower salary. Research has been done on whether or not player’s salaries and wins are connected.
Figure One: Digitech QM 1589 (http://www.jaycar.com.au/) 2016 levels while C weighting is the frequency sensitivity of the human ear at very high noise levels (Hear Forever, 2013). Measurement One is the sound pressure level of 8 acoustic environments that where examined to establish the quietest space possible, maintaining a reliable and consistent source of results. Measurement Two follows the assessment of Clarendon Street, a busy road; involving the observations of cars, trucks and trams that share the road. Measurement Three is the analysis between A and C weighted testing of pink noise from a single speaker repeated at 1 and 4 metres validating the application of the Inverse Square Law.
The Loudness button on consumer stereo receivers is an equalization circuit that boosts the highs and lows as the volume is lowered so the music will sound the same whether soft or loud. Noise-shaping circuits filter dither and quantization noise into the extreme upper range, where we will simply notice it less.