The following equation explains weekly hours of television viewing by a child in terms of the child's age, mother's education, father's education, and number of siblings: tvhours = Bo + Biage + B;age² + Bzmotheduc + Bfatheduc + Bssibs + u. We are worried that tvhours" is measured with error in our survey. Let tvhours denote the reported hours of television viewing per week. |(i) What do the classical errors-in-variables (CEV) assumptions require in this application? |(ii) Do you think the CEV assumptions are likely to hold? Explain.
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- Textbook authors must be careful that the reading level of their book is appropriate for the target audience. Some methods of assessing reading level require estimating the average word length. We've randomly chosen 20 words from a randomly selected page in Intro Stats and counted the number of letters in each word: 5, 5, 2, 11, 3, 5, 6, 8, 5, 4, 7, 2, 9, 4, 8, 10, 4, 7, 6, 9 Suppose that our editor was hoping that the book would have a mean word length of 6.8 letters. Does this sample indicate that the authors failed to meet this goal? With a significance level of 0.05, test an appropriate hypothesis and state your conclusion. (i.e state the appropriate null and alternative hypotheses, calculate the test statistic, conclude and interpret it).In a study aimed at creating reference values, abdominal circumference (measured in cm) was measured in adult men. It was found that the relationship to age could be described as abdominal circumference = 82 + 0.3 x age a) What is the analysis that produces such a formula called? b) At what age is the average abdominal circumference 100 cm?In June 2015, Gallup conducted a poll of a random sample of 14802 adults to determine the well-being of people living in the United States. One question asked, "Did you exercise at least 30 minutes for 3 or more days in the past week?" In the survey, 57.3% of males and 42.7% of females responded yes to this question. Which of the following is true about this scenario?A. 57:3% and 42.7% are both statistiesB. 57.3% and 42.7% are both parameter.C. If we took another random sample of 14802 adults, we would expect to get the exact same results.
- In a study of proctored and nonproctored tests in an online Intermediate Algebra course, researchersobtained the data for test results given below.Group 1 (Proctored): n = 35,30.74=x, s = 12.87Group 2 (Nonproctored): n = 32.62.88=x, s = 22.09 Use a 0.01 significance level to test the claim that students taking non-proctored test get a higher meanthan those taking proctored tests.et R2unrestricted and R2restricted be 0.54 and 0.30 respectively. The difference between the unrestricted and the restricted model is that you have imposed two restrictions. The number of regressors in the unrestricted model is 5. There are 500 observations. The F-statistic (under the assumption of homoskedasticity) in this case is 1. 4.61 2. 8.01 3. 98.5 4. 128.9In 2008, real GDP was 14,830.4. In 2009, real GDP was 14,418.7. Accordingly, we can infer that in 2009, Group of answer choices a) there must have been no change in real GDP. b) there must have been a decrease in unemployment. c) we had deflation. d) there was a recession. e) there must have been economic growth.
- We are studying the factors that contribute to unemployment at an individual level. UE, unemployment, is our dependent variable and it is a binary variable that takes the value 1 if an individual is unemployed and 0 if they are employed. We have a random sample and we estimate the following model: UE^= 0.508−0.051educ−0.023urban+0.005age(0.122) (0.012) (0.005) (0.002)n=6214, R2=0.474 where educ = an individual’s years of education urban = a dummy equal to 1 if the individual lives in an urban area and 0 otherwise age = an individual’s age in years What is the correct interpretation of the estimated coefficient on education?How do we calculate mean deviation?Discuss its significance and use in variousconcepts of statistics. How it differs fromquartile deviationA government study found that people who eat chocolate frequently weighless than people who don’t. Researchers questioned 1000 individuals fromCalifornia between the ages of 20 and 85 about their eating habits, andmeasured their weight and height. On average, participants ate chocolatetwice a week and had a body mass index (BMI) of 28. There was anobserved difference of five to seven pounds in weight between those whoate chocolate five times a week and those who did not eat any chocolate atall, with the chocolate eaters weighing less on average. Frequent chocolateeaters also consumed more calories, on average, than people who consumedless chocolate. Based on this summary, would you recommend thatAmerican’s who do not presently eat chocolate, consider eating chocolateup to five times a week if they want to lose weight? Why or why not?Explain.
- Vida Dampo is the purchasing clerk for Adanfopa Company. Adanfopa sells car filters. One of the most popular filters is the BMW, which has an annual demand of 4,000 units. The cost of each filter is $90, and the inventory carrying cost is estimated to be 10% of the cost of each filter. Vida has made a study of the costs involved in placing an order for any of the filters that Adanfopa Company stocks, and she has concluded that the average ordering cost is $25 per order. Furthermore, it takes about two weeks for an order to arrive from the supplier, and during this time the demand per week for Adanfopa Company is approximately 80.i. What is the EOQ?ii. What is the ROP? iii. What is the average inventory? What is the annual holding cost? iv. How many orders per year would be placed? v. What is the annual ordering cost? note please answer all the questions.What is differance between three sector ecnomoy and four sector ecnomoyDefine the Ordinary Least Squares Estimator? how OLS Estimates the Relationship Between Test Scores and the Student–Teacher Ratio?