Question # 1.6 6 Chapter 1 Introduction with the new method, and the other with
ID: 3271166 • Letter: Q
Question
Question # 1.6
6 Chapter 1 Introduction with the new method, and the other with the d in the SWREUSE file, provides information on the success each project in a sample of 24 new software development method. The water flow (in gallons) required to a. Identify the population, the samples, and the b. How could the sample data be used to com models. A PROMISE data set on software reuse, save ectiv ype pare cool each batch was recorded. failure of reusing previously developed software for Engineering. Vol. 28, 2002.) Of the 24 projects, 9 were b. Describe the population from which the sample is statistical inference to be made for this probl projects. (Data source: IEEE Transactions on Sofiware ern. judged failures and 15 were successfully implemented cooling effectiveness of the two systems? a. Identify the experimental units for this study COGAS 1.7 weekly carbon m onoxide data. The World Data Centre f selected. Greenhouse Gases collects and archives data f house and related gases in the atmosphere. One such set lists the level of carbon monoxide gas (meas c. Use the sample information to make an inference about green the population. Ex Cha Pi ured in arts per billion) in the atmosphere each week at the Cold Bay, Alaska, weather station. The weekly data for the 1.5 Ground motion of earthquakes. In the Journal of Earth quake Engineering (Nov. 2004), a team of civil and years 2000-2002 are saved in the COGAS file. environmental engineers studied the ground motion char acteristics of 15 earthquakes that occurred around the world. Three (of many) variables measured on each earth quake were the type of ground motion (short, long, or for ward directive), earthquake magnitude (Richter scale) and peak ground acceleration (feet per second). One of the goals of the study was to estimate the inelastic spectra a. Identify the variable measured and the correspondin experimental unit. b. If you are interested in describing only the weekly car. bon monoxide values at Cold Bay station for the years 2000-2002, does the data represent a population or a sample? Ex plain. of any ground motion cycle a. Identify the experimental units for this study 1.8 Monitoring defective items. Checking all manufactured items coming off an assembly line for defectives would be a costly and time-consuming procedure. One effective b. Do the data for the 15 earthquakes represent a popula tion or a sample? Explain. 1.6 Precooling vegetables. Researchers have developed a new precooling method for preparing Florida vegetables for market. The system employs an air and water mixture de- signed to yield effective cooling with a much lower water and economical method of checking for defectives volves the selection and examination of a portion of the items by a quality control engineer. The percentage of ex amined items that are defective is computed and then used flow than conventional hydrocooling. To compare the effec tiveness of the two systems, 20 batches of green tomatoes were divided into two groups; one group was precooled to estimate the percentage of all items manufactured the line that are defective. Identify the populatoi. sample, and a type of statistical inference to be made this problem.Explanation / Answer
Answer:
a).
Population: All vegetables produced in Florida
Sample: 20 batches of green tomatoes
Inference: is there any difference in average water flow for the two methods.
b).
From the collected amount of water flow for the 20 samples should be collected.
The mean and standard deviations of the data to be calculated for each method.
The independent sample t test to be used to compare the average water flow for the two methods.