Construct a 95% confidence interval for the difference in the true mean delivery times for Courier 1 and 2
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A law firm is evaluating the delivery of two courier delivery services in Cape Town. They believe that there is a difference between the average delivery times for the two career services. To investigate this matter further, the firm decides to use both courier services daily over a two month for deliveries to similar destinations. The delivery times for each Courier servers are recorded over the two month period. It is found that Courier 1 was used by the firm 12 times and the average delivery time was 43 minutes with a standard deviation of 12 minutes. Courier to was used 15 times, and the average delivery time was 36 minutes with a standard deviation of 8 minutes. Construct a 95% confidence interval for the difference in the true mean delivery times for Courier 1 and 2 (rounded off to two decimals).
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- An apartment management company wants to explore the consequences of allowing residents to have multiple dogs. They would like to find out whether the number of dogs predicts resident ratings. They would also like to control for the year the apartment complex was built because they know that might also affect the resident rating. They have collected data on several of their existing complexes. For each complex, they have counted the number of dogs currently living in the complex, the year the complex was built, and the average rating for that particular complex. They would like to perform a multiple regression on these variables to predict resident ratings. See data below: Multiple Dog Consideration Number of dogs Year of facility Rating (out of 5) 54 1975 2 31 1964 3.5 0 2015 4.8 11 2011 3.8 73 1964 2.3 23 2016 3.7 0 2015 4.7 49 1989 2.7 In this scenario, the y (dependent variable) is: Rating (out of 5) Number of Residents Number of Dogs Year of…The aim of this prac is to practice data gathering. Assume that you have been employed to improve the user experience of an interactive product such as a smartphone app, a digital media player, a Blu-ray player, computer software, or some other type of technology (you choose anything you can easily observe with the people around you). This existing product may be redesigned, or a completely new product may be created. To do the assignment, find a group of people or a single individual prepared to be the user group. These could be your family, friends, peers, or people in a local community group. For this assignment: Identify the product here: [1] Clarify the basic goal of improving the product by considering what this means in your circumstances. Watch the group (or person) casually to get an understanding of any issues that might create challenges for this activity and any information to help refine the study goals. [3] Explain how you would use each of the three data gathering…Sarah chose to live on the honors floor of her dorm because she was told that the students on that floor would be quiet and studious. She was told that students on the honors floor study 10.5 hours per week. After living on the honors floor for a few months, Sarah is convinced that the students around her study less than 10.5 hours a week. To test her claim, Sarah polls 10 students on her floor regarding the number of hours per week that they spend studying. Use the results in the table below to test Sarah’s claim at the 0.05 level of significance. Assume that the population distribution is approximately normal. hours of study: 12,4,14,9,8,6,10,12,11,9
- A health researcher studying child birth is interested in the possible effect that smoking by the mother during pregnancy has on the baby's birth weight. To investigate, the researcher conducts an observational study by reviewing 400 records of women in their twenties who have recently given birth for the first time. For each record, he notes whether or not the woman smoked during pregnancy and the baby's birth weight, in addition to the woman's education level, and age. From the data, the researcher creates two groups: women in their twenties who smoked during pregnancy and women in their twenties who did not smoke during pregnancy. Then he compares the average birth weight between the two groups. (a)Why might the researcher have chosen to perform an observational study (by gathering information from past records) and not a randomized experiment (by assigning pregnant women to either the smoking or nonsmoking group at random)? Choose the best answer from the choices below. In a…To inspect manufacturing processes, companies typically examine samples of parts for deficiencies. One company that manufactures ballpoint pens selected samples of ,000 pens on each of 17 days. The company recorded, for each sample of 1,000, the number of defective pens in the sample. Here are their data. 1, 1, 2, 2, 2, 3, 3, 5, 5, 6, 7, 7, 10, 11, 13, 14, 18 Send data to calculator Send data to Excel Frequency 8. 6+ 2+ 2 4 12 16 20 Number of defective pens (out of 1000) O Mean (a) For these data, which measures of OMedian central tendency take more than one value? Mode Choose all that apply. None of these measures OMean (b) Suppose that the measurement 18 (the largest measurement in the data set) were OMedian replaced by 39. Which measures of central tendency would be affected by the change? OMode Explanation Check O 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy Accessibility 99+ O Type here to search 2. 4.Burning fuels in power plants and motor vehicles emits carbon dioxide (CO2), which contributes to global warming. The CO2 emissions (metric tons per capita) for countries varies from 0.02 in Burundi to 44.02 in Qatar. Although the data set includes 214 countries, the CO2 emissions of 15 countries are not available on the World Bank database. The data set is too large to display but the data for the first five countries is given. Use the full data set with data on the 214 countries to answer the questions. To access the complete data set, click the link for your preferred software format: Excel Minitab JMP SPSS TI R Mac-TXT PC-TXT CSV Crunchlt! Country CO2 Emissions (Metric Tons per Capita) Aruba 23.92 Andorra 5.97 Afghanistan 0.43 Angola 1.35 Albania 1.61 Find the mean and the median for the full data set. Round your answers to three decimal places. The mean for these data is tons per person The median for these data is tons per person
- Large companies typically collect volumes of data before designing a product, not only to gain information as to whether the product should be released, but also to pinpoint which markets would be the best targets for the product. Several months ago, I was interviewed by such a company while shopping at a mall. I was asked about my exercise habits and whether or not I'd be interested in buying a video/DVD designed to teach stretching exercises. I fall into the male, 18 35-years-old category, and I guessed that, like me, many males in that category would not be interested in a stretching video. My friend Jenny falls in the female, older-than-35 category, and I was thinking that she might like the stretching video. After being interviewed, I looked at the interviewer's results. Of the 97 people in my market category who had been interviewed, 12 said they would buy the product, and of the 116 people in Jenny's market category, 31 said they would buy it. Assuming that these data eame from…Please answer the question in the photo. Thank you!assume that the facility has been operational for 6 months. The company was fully staffed on Day 1 but recently has seen an increase in turnover. In response, the HR Director (located in NE) began the process of gathering data from both turnover reports/exit interviews from both locations for the first half of the year (January – June). Below is a breakdown of turnover by Position, Exit Month, Department, Location, Manager, and Reason. Unfortunately, the Reason has not been recorded consistently at the Texas location and the HR Manager (who would know this information) has recently left the company. Based on the data provided, what conclusions could you draw regarding potential issues at these facilities Position Pay Grade Exit Month Department Location Manager Reason Customer Service Rep 7 Janurary Operations TX Smith Job Fit Customer Service Rep 7 February Operations NE Jones Lack of Growth Marketing Manager 13 March Marketing NE Shultz Personal Operations Lead 8…
- A law firm is evaluating the delivery time of two courier delivery services in Cape Town. They believe that there is a difference between the average delivery times for the two courier services. To investigate this matter further, the firm decides to use both courier services daily over a two month period for deliveries to similar destinations. The delivery times for each courier service are recorded over the two month period. It is found that Courier 1 was used by the firm 12 times and their average delivery time was 43 minutes with of standard deviation of 12 minutes. Courier 2 was used 15 times, and their average delivery time was 36 minutes with a standard deviation of 8 minutes. Construct a 95% confidence interval for the difference in the true mean delivery times for Courier 1 and Courier 2 (rounded off to two decimals).A sensory Psychologist wants to test if age affects a person's ability to detect changes in color presented on a computer screen. She recruits 3 different age groups (young, mid aged, elderly) to test. She also wants to know if bilingual people are different in their ability to detect color changes relative to non bilingual people, so half of the 60 participants are bilingual, the other not bilingual. Complete the source table below for her results. Complete the source table below and answer the question that follows the table also Source SS df MS Fcalculated P_.05 Fcritical Between 360 5 FactorAge FactorBilingual 220 Interaction 95 Within 1825 54 Total Was there a significant effect of age?We want to investigate the average study time per day of School students. The official number of School students is 20,000. We have collected data using the actual contact number of School students. It contains individual-level information on the study hours per day. The number of observations in a data set is 20,000. The same person has not been collected more than once in this data. According to this data, the average study time per day of School students is 3 hours and 20 minutes. 1.what's unique about this data 2.how do you perform your own hypothesis test using this data?
