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TechBuzz is an IT company that monitors the status of large data warehouses. According to TechBuzz, last year the majority of the data servers used by energy-based companies were over-utilized. A sample of 190 servers (all used by energy-based companies) showed that 142 were over-utilized, 12 were used efficiently, and 36 were underutilized. a. What is the point estimate of the proportion of the servers that were under-utilized? b. Determine the margin of error and provide a 95% confidence interval for the proportion of the servers that were over-utilized. c. What is the minimum sam

Tony Zamora, a real estate investor, has just moved to Clarksville and wants to learn about the local real estate market. He wants to understand, for example, the relationship between geographical segment of the city and selling price of a house, the relationship between selling price and number of bedrooms, and so on. Tony has randomly selected 25 house-for-sale listings from the Sunday newspaper and collected the data listed below. Garage Number of Size Bathrooms (cars) Segment of City Selling Price (5000) House Size (00 sq. ft.) Number of Bedrooms Northwest 290 21 South 95 11 Northeast 170 19 Northwest 375 38 West 350 24 4 South 125 10 2 West 310 31 4 West 275 25 3 Northwest 340 27 5 Northeast 215 22 4 Northwest 295 20 4 South 190 24 4 Northwest 385 36 5 West 430 32 5 South 185 14 3 South 175 18 4 Northeast 190 19 4 Northwest 330 29 4 West 405 33 5 Northeast 170 23 4 West 365 34 5 Northwest 280 25 4 South 135 17 3 Northeast 205 21 4 West 260 26 4 232022222NON 2233232122 a. Construct…

Which of the following is not a common data source? A. Customer Surveys B. Social Media Platforms C. Website Traffic Logs D. Key Performance Indicators (KPIs)

The Commerce Department reported receiving the following applications for the MalcolmBaldrige National Quality Award: 23 from large manufacturing firms, 18 from large service firms, and 30 from small businesses.a. Is type of business a categorical or quantitative variable?b. What percentage of the applications came from small businesses? Figure 1.8 provides a bar chart showing the amount of federal spending for the years 2002to 2008 (USA Today, February 5, 2008).a. What is the variable of interest?b. Are the data categorical or quantitative?c. Are the data time series or cross-sectional?d. Comment on the trend in federal spending over time. The Food and Drug Administration (FDA) reported the number of new drugs approvedover an eight-year period (The Wall Street Journal, January 12, 2004). Figure 1.9 providesa bar chart summarizing the number of new drugs approved each year.a. Are the data categorical or quantitative?b. Are the data time series or cross-sectional?c. How many new drugs…

Most engaged couples expect or at least hope that they will have high levels of marital satisfaction. However, because 54% of first marriages end in divorce, social scientists have begun investigating influences on marital satisfaction. (Data Source: National Center for Health Statistics.) A counseling psychologist sets out to look at the role of having children in relationship longevity. She decides to measure marital satisfaction in a group of couples with children and a group of childless couples. She chooses the Marital Satisfaction Inventory, because it refers to "partner" and "relationship" rather than "spouse" and "marriage," which makes it useful for research with both traditional and nontraditional couples. Higher scores on the Marital Satisfaction Inventory indicate greater satisfaction. Assume that these scores are normally distributed. A sample of 39 couples with children scored an average of 51.1 with a sample standard deviation of 9.2 on the Marital Satisfaction…

Most engaged couples expect or at least hope that they will have high levels of marital satisfaction. However, because 54% of first marriages end in divorce, social scientists have begun investigating influences on marital satisfaction. (Data Source: National Center for Health Statistics.) A counseling psychologist sets out to look at the role of having children in relationship longevity. She decides to measure marital satisfaction in a group of couples with children and a group of childless couples. She chooses the Marital Satisfaction Inventory, because it refers to "partner" and "relationship" rather than "spouse" and "marriage," which makes it useful for research with both traditional and nontraditional couples. Higher scores on the Marital Satisfaction Inventory indicate greater satisfaction. Assume that these scores are normally distributed. A sample of 39 couples with children scored an average of 51.1 with a sample standard deviation of 9.2 on the Marital Satisfaction…

A retail store started a new inventory system on January 1, 2019. The loss prevention manager compared the number of units that were missing from each month's inventory in 2018 with the number of units that were missing from each month's inventory in 2019. The results are provided in the table below. 2018 2019 87 7171 79 75 91 67 78 76 82 68 75 65 88 72 86 75 83 64 77 70 89 73 83 63 What conclusion could be made using the median and interquartile range from the data?     The median for 2018 is 83, which is greater than 70.5, the median for 2019. The interquartile range for 2018 is 9, which is greater than the interquartile range for 2019, 8. The median for 2018 is 6969, which is less than 82.5, the median for 2019. The interquartile range for 2018 is 8.5, which is the same as the interquartile range for 2019. The median for 2018 is 83, which is greater than 71, the median for 2019. The interquartile range for 2018 is 16, which is greater…

An agent for a residential real estate company in a suburb located outside a major city has the business objective of developing more accurate estimates of the monthly rental cost for apartments. Toward the​ goal, the agent would like to use the size of an​ apartment, as defined by square footage to predict the monthly rental cost. The agent selects a sample of 8​ one-bedroom apartments and the data are shown.    Monthly Rent​ ($) 925 1,550 800 1,450 1,950 950 1,800 1,300   Size​ (Square Feet) 800 1,350 1,050 1,100 2,000 650 1,300 950     . Construct a scatter plot. Choose the correct graph below.     A.       02,00002,000Size (sq ft)Rent ($)         A scatter plot has a horizontal axis labeled Size (in square feet) from 0 to 2000 in increments of 400 and a vertical axis labeled Rent ($) from 0 to 2000 in increments of 400. A series of plotted points are clustered around a line that falls from left to right passing through…

According to the 2017 Corporate Travel Index compiled by Business Travel News, the average daily cost for business travel in the United States rose to $321 per day (Executive Travel website). The file Travel contains sample data for an analogous study on the estimated daily living costs for an executive traveling to various international cities. The estimates include a single room at a four- star hotel, beverages, breakfast, taxi fares, and incidental costs. Click on the datafile logo to reference the data. DATA file City Daily Living Cost ($) City Daily Living Cost ($) Bangkok 242.87 Мехico City 212.00 Bogota 260.93 Milan 284.08 Cairo 194.19 Mumbai 139.16 Dublin 260.76 Paris 436.72 Frankfurt 355.36 Rio de Janeiro 240.87 Hong Kong 346.32 Seoul 310.41 Johannesburg 165.37 Tel Aviv 223.73 Lima 250.08 Toronto 181.25 London 326.76 Warsaw 238.20 Madrid 283.56 Washington, D.C. 250.61 a. Compute the sample mean (to 2 decimals). 260.21 b. Compute the sample standard deviation (to 2 decimals). S…