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數學與統計
大學

求救 統計#9 (可支薪)

9.A society PAWT is primarily concerned with the amount of TV viewed by todays youth. It asked 300 parents of elementary school aged children to estimate the number of hours their child spent watching television in any given week. The mean and the standard deviation for their responses were 17 and 3, respectively. PAWT then constructed a stem-and-leaf display for the data, which showed that the distribution of the number of hours was a symmetric, mound-shaped distribution. Identify the interval where you believe appropriately 95% of the television viewing fell in the distribution.
數學與統計
大學

求救 統計 #8 (可支薪)

8. The NBI data were analyzed and the results made available at the FHWA Web site. Using the FHWA inspection ratings, each of the 608,272 highway bridges in the US was categorized as structural deficient, functionally obsolete, or safe. About 13.5% of the bridges were found to be structural deficient, while 3.5% were functionally obsolete. a. What is the variable of interest to the researchers? b. Is the variable of part a quantitative or qualitative? c. Is the data set analyzed a population or a sample? Explain. d. How did the NBI obtain the data for the study?
數學與統計
大學

急 求救統計 #6 (可支薪)

6.The National Science Foundation (NSF) sponsored a study on girls participation in informal science, technology, engineering, or mathematics (STEM) programs. The results of the study were published in Cascading Influences: Long-Term Impacts of Informal STEM Experiences for Girls (March 2013). The researchers sampled 174 young women who recently participated in a STEM program. They used a pie chart to describe the geographic location (urban, suburban, or rural) of the STEM programs attended. Of the 174 participants, 107 were in urban areas, 57 in suburban areas, and 10 in rural areas. a. Determine the proportion of STEM participants from urban areas. b.Determine the proportion of STEM participants from suburban areas. c.Determine the proportion of STEM participants from rural areas. d. Multiply each proportion in parts a-c by 360 to determine the pie slice size (in degrees) for each location. e.Use the results, part d, to construct a pie chart for geographic location of STEM participants. f.Interpret the pie slice for urban areas. g.Convert the pie chart into a bar graph. Which, in your opinion, is more informative?
數學與統計
大學

急!求救 #6 8 9 如果需要酬勞可私下談 (ex.$70題)

pie participation in informal 6.The National Science Foundation (NSF) sponsored a study on girls' science, technology, engineering, or mathematics (STEM) programs. The results of the study were published in Cascading Influences: Long-Term Impacts of Informal STEM Experiences for Girls (March 2013). The researchers sampled 174 young women who recently participated in a STEM program. They used a pie chart to describe the geographic location (urban, suburban, or rural) of the STEM programs attended. Of the 174 participants, 107 were in urban areas, 57 in suburban areas, and 10 in rural areas. a.Determine the proportion of STEM participants from urban areas. b.Determine the proportion of STEM participants from suburban areas. c.Determine the proportion of STEM participants from rural areas. d. Multiply each proportion in parts a-c by 360 to determine the pie slice size (in degrees) for each location. e.Use the results, part d, to construct a pie chart for geographic location of STEM participants. f.Interpret the pie slice for urban areas. g.Convert the pie chart into a bar graph. Which, in your opinion, is more informative? 7. All high way bridges in the US are inspected periodically for structural deficiency by the FHWA. Data from the FHWA inspections are compiled into the National Bridge Inventory (NBI). Classify each variable below as quantitative or qualitative. a. Length of maximum span (feet). b. Number of vehicle lanes. c. Toll bridge (yes or no). d. Average daily traffic. e. Condition of deck (good, fair, or poor). f. Bypass or detour length (miles). g. Route type (interstate, U.S., state, county, or city) 8. The NBI data were analyzed and the results made available at the FHWA Web site. Using the FHWA inspection ratings, each of the 608,272 highway bridges in the US was categorized as structural deficient, functionally obsolete, or safe. About 13.5% of the bridges were found to be structural deficient, while 3.5% were functionally obsolete. a. What is the variable of interest to the researchers? b. Is the variable of part a quantitative or qualitative? c. Is the data set analyzed a population or a sample? Explain. d. How did the NBI obtain the data for the study?
商業與管理
大學

請問這題怎麼算?

7/13 簡答題(10.0分) Price (dollars per movie) Quantity demanded, weekend (movies per week) 0- Quantity demanded, weekday (movies per week 18: 15- 100+ 0- 122 200 0- 9- 300e 100e 2002 62 400e 3- 500e 300e Roxie's Movie Theater has a monopoly and discovers that at $12 a movie, no one is buying movie tickets during weekdays. Roxie's conducts a survey and the table above reveals the results of the survey. Roxie decides to price discriminate between weekend and weekday moviegoers. The marginal cost of a showing a movie is $6. Roxie's charges $_ on weekdays and $ on weekends.
數學與統計
大學

求解😭🙏

16. 假設你是時尚界的專家,想要蒐集資訊比較代言 Liz Claiborne 的模特兒與代言 Calvin Klein 的 模特兒之月薪。 以下是15位 Claiborne 模特兒樣本的月薪(千美元)。 $3.3 $4.5 $4.6 $3.5 $5.2 $5.0 4.8 $4.5 4.4 $3.4 4.6 $3.4 3.6 $6.0 15.0 以下是12位 Klein 模特兒樣本的月薪(千美元)。 $3.6 $ $3.1 2.3 $4.0 $3.8 $3.7 4.0 $3.8 $ $5.9 $4.9 $3.6 $3.6 我們說 Claiborne 模特兒賺得較多,這樣的結論合理嗎?使用 0.05 的顯著水準並假設母體標準 差不同。
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