Why is it important to maximize the degree to which samples and data used to train or build algorithms are representative of the population?
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- Nana AB. supplies a range of computer hardware and software to 2000 schools within a large municipal region of Spain. When Nana AB. won the contract the issue of customer service was considered to be central to the company being successful at the final bidding stage. The company has now requested that its customer service director creates a series of graphical representations of the data to illustrate customer satisfaction with the service. The following data has been collected during the last six months and measures the time to respond to the received complaint (days).52434661563832 87783496745423 5632861281325253 3445213142125321 437662127336712 7889261074782332 2621567891851512 1556452145262134 2812672324432565 238872178547679 The customer service director has analysed this data to create a grouped frequency table and plotted the histogram. From this he made a series of observations regarding the time to respond to customer complaints. He now wishes to extend the analysis to use…An airline operates a call center to handle customer questions and complaints. The airline monitors a sample of calls to help ensure that the service being provided is of high quality. Ten random samples of 100 calls each were monitored under normal conditions. The center can be thought of as being in control when these 10 samples were taken. The number of calls in each sample of 100 not resulting in a satisfactory resolution for the customer is as follows: Excel File: data 19-09.xls 4 5 3 2 3 3 4 6 4 7 a. What is an estimate of the proportion of calls not resulting in a satisfactory outcome for the customer when the center is in control? Round your answers to three decimal places. 0.041 b. Construct the upper and lower limits for a p chart for the manufacturing process, assuming each sample has 100 calls. Round your answers to four decimal places. If answer of LCL is negative then enter "0". UCL 0.1005 LCL = c. With the results of part (b), what conclusion should be made if a sample…Define the concept of Weighted Least Squares?
- A data set has 5,000 labeled examples. If you partition it into training and testing data using 5-fold cross-validation, each training set will contain (). examples and a total of (i) O (1) 1000, (ii) 4000, (ii) 10 O (i) 4000, (i) 1000, (ii) 10 O (1) 1000, (i) 4000, (ii) 5 O () 4000, (i) 1000, (i) 5 examples, each test set will contain (ii) models will be generated.What measures of fit are typically used to assess binary dependent variableregression models?Please give me an example of methods and design for a sequential design (combines cross sectional study and longitudinal study) that would analyze the changes in memory abilities as individuals age?
- How do you find the mode of a particular column in stat crunch?This problem is designed to help you see the effect of outliers can have on an ANOVA test.Students enrolled in developmental mathematics classes at a community college are encouraged to go to the Math Tutoring Center (MTC) for help with their homework. Some students schedule their time so that they go once or twice a week to focus on all of their math homework at once. Some students even start forming study groups and meet at the MTC to work together. The staff that run the MTC want to know if some classes are using their services more than others. They collect data from 5 classes and 17 students per class that attend the session at least once in the term. The dependent variable is the number of days a student visits the MTC during one academic term (about 12-13 weeks). Group 1 Group 2 Group 3 Group 4 Group 5 10 5 11 16 7 12 15 21 14 22 14 13 17 9 12 12 12 20 13 20 4 6 20 9 8 17 19 20 43 17 10 12 9 49 14 15 5 15 13 11 7 7 16 14 8 10 12 12 14 14 23 9 7 14…The National Health and Nutrition Examination Study (NHANES) had a random sample of 9317 participants recall their diet over the past 24 hours. The information in this sample was used in a recent study that found that, on average, 57.9% of the calories eaten by participants were obtained from ultra-processed foods that include substances not used in culinary preparations, such as flavors, colors, sweeteners, emulsifiers, and other additives. One of the limitations of the study reported by the authors was the dependence on the dietary recall of individuals. The authors were concerned with: (Choose one and explain why in 1-2 sentances) A) response bias B) undercoverage C) overstratification
- A local bank has two branches in a cty: one in the business center of the city and another-in a residential area. The bank's operations manager wants to Improve front-office employee scheduling during the lunch hour (12:00-13:00) period. The manager starts with studying the customer walting times at the two branches and collects data for two groups of 35 customers at each branch. Customers at the business-center branch walted on average 3.8 minutes, whle those at the residential branch waited 4.4 minutes on average, Assume that the population standard deviations are 1.8 (business-center branch) and 2.5 tresidential branch). a. Considering the real-ife problem, determine the point estimate of the unknown quantity that needs to be estimated. (Round to two decimal places.) b. Determine the critical value needed to compute a Bs confidence interval (Round to two decimal places.) c. Compute the confidence interval the operations manager would be interested in computing using the confidence…The more costly and time-consuming it is to export and import, the more difficult it is for local companies to be competitive and to reach international markets. As part of an initial investigation exploring foreign market entry, 9 countries were selected from each of four global regions. The cost associated with importing a standardized cargo of goods by sea transport in these countries (in US$ per container) is stored in the accompanying data table. Complete parts (a) through (d). East Asia & Pacific Eastern Europe & Central Asia Latin America & Caribbean Middle East & North Africa240 77 1200 466777 335 688 397266 396 970 554383 83 290 644580 150 545 181220 306 420 646389 1125 450 695233 655 583 754392 100 1500 779 c. At the 0.05 level of significance, is there evidence of a difference in the variation in cost of importing among the four global regions? Determine…Question 7 Consumer report uses a survey of readers to obtain customer satisfaction ratings for the nation's largest retailers. Each survey respondent is asked to rate a specified retailer in terms of six factor: quality of products, selection, value, check out efficiency, service and store layout . Any overall satisfaction score summarizes the rating for each respondent with 100 meaning the respondent is completely satisfied in terms of all six factors. Sample data respresentative of independeent samples of Target and Walmart customers are show below. Target Walmart n - 25 n = 30 mean = 79 mean = 71 part a Formulate the null and alternative hypoteses to test whether there is a difference between the population mean customer satisfactions scores for the two retailers part b Assume…
