Part A. Use data charity.RData, collected by Franses and Paap (2001), regarding charitable contri- butions in the Netherlands. You will investigate the relationship between charitable contributions made by a person (gift) and the number of mailings per year sent by a charitable organization to that person (mailsyear). You consider a MLR model additionally controlling average of past gift amount (avggift) and response rate to mailings (propresp). The units for the gift and avggift variables, are in Dutch guilders that was the currency of the Netherlands from the 17th century until 2002, when it was replaced by the euro. (1) Write down econometrics models for your MLR model, using the variable names in the data (instead of x1, x2, 3 and y).

Deliveroo is an online food delivery company founded in London. Recently they upgraded their Australian IT systems to better allocate which orders are batched together with which drivers and their associated transport vehicle (Car, Motorbike, Bicycle, .). They are now measuring the (hoped) improvement in the average time between a customer submitting an order and the delivery of that order to the customer (called the completion time). Prior the upgrade, the mean completion time was 30 mins. A random sample of 49 orders placed with the new IT has a mean completion time of 27.2 minutes with a 6 min sample standard deviation. a. Use the critical value approach at a 0.01 level of significance, to determine if there is evidence that the completion time has improved. The null and alternative hypotheses for this test are: Ο Α. Ho μs 27.2 H1: H> 27.2 Ο Β. Ho: μ3 0 H1:µ 30 H1:Hs 30 O D. Ho: H2 27.2 Ο Ε. Ho: μ 30 What is the test statistic for this test? tSTAT =| (Round your answer to two…

Assuming there are 150 students in our statistics class, 20 of you have received 4 hours of study strategies tutoring before this semester starts. What we have known is that the mean score of your final grades in our statistics class is 72 with a SD of 6 and the mean score of the 20 students who have received tutoring is 75 with a SD of 5. As the instructor of this course, I would like to know whether the tutoring has impacted your final grades. Please use the one sample Z-test to help me find out the correct answer. You are required to follow and further write down the famous eight steps and the computation of the Z-test statistic

From the list below of the data being collected, identify which data would be considered variable data: Select ALL correct answers. Door closing speed at Honda Time before a call is answered at a call center Number of mistakes/miss-information given per call at a call center Percentage of medical bills with more than one defect Number of defects on one medical bill Weight of a golf ball Meal delivery time at a restaurant Number of orders with incorrect products per every 100 sampled at Amazon     NEXT QUESTION  From the list below of the data being collected, identify which data would be considered attribute data: Select ALL correct answers. Door closing speed at Honda Time before a call is answered at a call center Number of mistakes/miss-information given per call at a call center Percentage of medical bills with more than one defect Number of defects on one medical bill Weight of a golf ball Meal delivery time at a restaurant…

Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?"The results are in Table 2.71. Also, include left endpoint, but not the right endpoint.Salary ($) Relative Frequency< 20,000 0.0220,000–25,000 0.0925,000–30,000 0.1930,000–40,000 0.2640,000–50,000 0.1850,000–75,000 0.1775,000–99,999 0.02100,000+ 0.01Table 2.71a. What percentage of the survey answered "not sure"?b. What percentage think that middle-class is from $25,000 to $50,000?c. Construct a histogram of the data.i. Should all bars have the same width, based on the data? Why or why not?ii. How should the <20,000 and the 100,000+ intervals be handled? Why?d. Find the 40th and 80th percentilese. Construct a bar graph of the data

eat out or in The overall change in the consumer price index is a weighted average of changes in various categories. on november 19, 2011 the boston globe reported the data displayed in figure 5.7.  is it reasonable to say that about 40% of food expenses are for food away from home?

I purchased the fastest internet speed I could. The local company promised me 1.0 Gbps speed on average. I tested my connection once, and got 0.8 Gbps. If I assume that connection speeds follow an exponential distribution, and I use the test of hypothesis framework, does my single observation provide evidence that my true average internet speed is less than the 1.0 Gbps claimed? Use a 10% significance level.

An ANOVA would help establish a cause-effect relationship true or false?

Your company is evaluating two cloud-based secured data storage services. "Great Sky," the newer service, claims its uploading and downloading speeds are faster than the older service, "Clear and Steady Skies." You need to make a decision based on published access times for both services at different times and for varying file sizes. To make your decision, you purchase two statistical studies from which you discover the average download time for Great Sky is 0.67 sec. per MB and for Clear Steady Skies is 0.84. Additionally, the studies indicate the following sample information: NGS = 60 ncss = 50, SGS = 0.25 and scss = 0.55. Use a .05, and the five step hypothesis testing procedure to make the appropriate decision. Prepare an Excel worksheet properly labeled and well formatted to share with your boss (a very picky person that truly appreciates good looking work product).

Nature lovers’ association of Australia, launched a campaign to encourage paper less communication and/or recycling of used papers to save the trees to reduce global warming. Hence, many small businesses have scaled up their business such as new forms of online document exchanges and collecting used papers and cardboards from households and companies. Abita Recycling Ltd is one such company which is operates in Melbourne. The financial analysist of the company has estimated that the firm would make a profit if the mean weekly collection of papers and cardboards from each household exceeded 1KG. To examine the feasibility of a recycling plant, a random sample of 100 households was selected and sample mean and standard deviations are 1.1KG and 0.35KG respectively. Following the 6-step process of hypothesis testing, you are required to examine do this information provide sufficient evidence at 99% confidence to allow the analyst to conclude that a recycling plant would be profitable?