C.Neither
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In case-crossover studies, all fixed individual characteristics that might confound the association of interest are controlled for.
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- The medical community unanimously agrees on the health benefits of regular exercise, but are adults listening? During each of the past 15 years, a polling organization has surveyed americans about their exercise habits. In the most recent of these polls, slightly over half of all American adults reported that they exercise for 30 or more minutes at least three times per week. The following data show the percentages of adults who reported that they exercise for 30 or more minutes at least three times per week during each of the 15 years of this study. Years 1 - 15 % of adults reported at least 3x week 41.0 44.5 49.9 44.9 47.6 52.1 47.1 49.8 50.6 45.7 48.1 54.6 46.6 48.9 52.4 use simple linear regression to find the parameters for the line that minimizes MSE for this time series. Do not round your interim computations and round your final answers to four decimal places. For subtractive or negative numbers use a minus sign. (Example: -300)y-intercept, b0 = Slope, b1 = MSE =…2. Two bank officers examined eleven loan applications Compute the rank correlation and ranked them. coefficient and determine if it is significant. Officer I 1 7 4 2 3 6 . 5 9. 10 8. 11 Officer 1 6. 52 3 4 7. 11 8. 10 9. II3. The table below shows the expected years of schooling and gross domestic product (GDP) of the Southeast Asian countries in 2017. Use this information to answer the following: 1. Determine the correlation between the expected years of schooling and GDP. II. Based on the result, what can you conclude about the relationship between the expected years of schooling and GDP? Country Expected Years of Schooling GDP per capita (in international-$) Brunei 14.5 71809.3 Cambodia 11.7 3645.1 Indonesia 12.8 11188.7 Laos 11.2 6397.4 Malaysia 13.7 26808.2 Myanmar 10 5591.2 Philippines 12.6 7599.2 Singapore 16.2 85535.4 Thailand 14.7 16277.7 Vietnam 12.7 6171.9 Source: https://ourworldindata.org/grapher/expected-years-of-schooling-vs-qdp-per-capita
- a) The analysts’ stock recommendations are of considerable interest to investors. A study looking at the subsequent performance of new buy and sell recommendations by analysts over a period of time found the following results: Successful Unsuccessful New Buy 957 1233 New Sell 503 221 Note: A buy recommendation is ‘successful’ if the stock outperforms the benchmark by at least 4% over the next year. A sell recommendation is ‘successful’ if the stock underperforms the benchmark by at least 2% over the next year. (iii) What is the probability that a chosen recommendation is either a new buy or successful?1.) The data in the table below show years of teaching experience and annual salary in dollars for 12 randomly selected mathematics instructors in Illinois colleges/ universities for the 2013/2014 school year. Is there a linear correlation between a mathematics instructor’s years of experience and his or her annual salary? Number of Years 7 9 6 7 11 12 11 3 3 7 9 1 Salary (in Dollars) $48,897.00 $62,866.00 $54,585.00 $56,611.00 $53,541.00 $53,541.00 $47,027.00 $47,970.00 $46,668.00 $48,029.00 $46,735.00 $45,000.00 THE OTHER QUESTION 2.) Does incubation or gestation time affect an animal’s average lifespan? Some animals have lifespans that average well over 100 years. The following table lists animals that have some of the longest lifespans on the earth. Is there a correlation between an animal’s gestation/incubation period and its average lifespan in years? Animal: Nile crocodile, Aldabra giant tortoise, Lake sturgeon, Galápagos tortoise, Bowhead whale Average Lifespan (in…The "(Subject Matter )" that best describe this Gauguin painting is? O Folklore O Imaginative O Historical C %23 &. 4. 6. 7. 9. y * CO o o o o
- A study on the preference of high school students in the choice of reading materials. Descriptive research Correlational research Experimental Research Historical quantitative research Causal researcha) The analysts’ stock recommendations are of considerable interest to investors. A study looking at the subsequent performance of new buy and sell recommendations by analysts over a period of time found the following results: Successful Unsuccessful New Buy 957 1233 New Sell 503 221 Note: A buy recommendation is ‘successful’ if the stock outperforms the benchmark by at least 4% over the next year. A sell recommendation is ‘successful’ if the stock underperforms the benchmark by at least 2% over the next year. (iv) What is the probability of choosing a successful stock, given a new buy recommendation?3. Travelers who have no intention of showing up often fail to cancel their hotel reservations in a timely manner. These travelers are known, in the parlance of the hospitality trade, as "no-shows". To protect against no-shows and late cancellations, hotels invariably overbook rooms. A recent study examined the problems of over-booking rooms in the hotel industry. The following data, extracted from the study represent the daily numbers of late cancellations and no-shows for a random sample of 10 days at a hotel: 18, 16, 16, 16, 14, 18, 16, 18, 14, 19. c) Count the number of measurements that actually fall within the interval(-28, +2s) and express the interval count as a percentage of total number of measurements. at least 75% 100% 68% 95%
- Express House Delivery Service provides high quality service to customers. The company guarantees a refund of all charges if a package it is delivering does not arrive at its destination by the specified time. It is known from past data that despite all efforts, 2% of the packages mailed through this company do not arrive at their destinations within the specified time. Suppose a corporation mails 10 packages through Express House Delivery Service on a certain day.The medical community unanimously agrees on the health benefits of regular exercise, but are adults listening? During each of the past 15 years, a polling organization has surveyed americans about their exercise habits. In the most recent of these polls, slightly over half of all American adults reported that they exercise for 30 or more minutes at least three times per week. The following data show the percentages of adults who reported that they exercise for 30 or more minutes at least three times per week during each of the 15 years of this study. Year Percentage of Adults Who Exercise 30 or more minutes at least three times per week 1 41.2 2 45.1 3 47.3 4 45.6 5 46.6 6 44.5 7 47.8 8 50 9 48.1 10 49.1 11 50.1 12 52.1 13 50.8 14 54.6 15 52.4 Choose the correct time series plot. (i) (ii) (iii) (iv) Does a linear trend appear to be present? use simple linear regression to find the parameters for the line that minimizes MSE…a. Correlation coefficient between hours spend on using mobile per day and hours spend on reading books per day. b. Draw the scatter diagram of the spending hours on using mobile and reading books per day. c. Give the statistical meaning of the relationship between the spending hours on using mobile and reading books per day.