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Decision Science
June 2024 Examination
- In the world of social media, understanding the factors that contribute to the number of likes on a post is crucial for content creators. Let’s consider a scenario where you want to predict the number of likes on Instagram posts based on two variables: the number of followers and the length of the caption.
Post | Likes | Followers | Caption
Length |
1 | 120 | 5000 | 150 |
2 | 85 | 5500 | 180 |
3 | 100 | 6000 | 200 |
4 | 110 | 4500 | 160 |
5 | 95 | 7000 | 140 |
6 | 130 | 5200 | 170 |
7 | 75 | 5800 | 190 |
8 | 115 | 6300 | 150 |
9 | 80 | 4800 | 180 |
10 | 150 | 7500 | 160 |
11 | 105 | 5100 | 130 |
12 | 90 | 6700 | 170 |
13 | 125 | 5900 | 200 |
14 | 70 | 6800 | 150 |
15 | 140 | 5400 | 180 |
16 | 95 | 7200 | 160 |
17 | 120 | 4600 | 140 |
18 | 110 | 7100 | 170 |
19 | 100 | 5600 | 180 |
20 | 145 | 8000 | 120 |
Note:
Well, you must do these calculations using EXCEL and write the interpretation of the following.
- Hypothesized regression model
- R-square adjusted
- Multiple R
- ANOVA Table
- Significance of Regression coefficients. (10 Marks)
Ans 1.
Introduction
In the digital age, social media platforms like Instagram have become critical venues for content dissemination, enabling users to engage with a global audience. For content creators, understanding what drives engagement on their posts is essential. Engagement, typically measured by the number of likes, can be influenced by various factors such as the content’s reach and its appeal. In this study, we focus on predicting the number of likes an Instagram post might receive based on two specific variables: the number of followers the poster has and the length of the post’s caption
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2.Samantha Patel, employed as an analyst in a renowned technology firm, is contemplating investing her savings in the stock market. Recommendations from her friends, who possess expertise in stock market investments, led her to consider investing in
‘TechGen’ and ‘InnovateCorp’ shares. An economist friend, Rahul Kapoor, has outlined four different scenarios regarding potential returns on Samantha’s investments. The payoff figures for one unit of share in INR for each scenario are as follows:
Payoff (Profit within one month
on one unit of share in INR) |
Scenario 1
(s1) |
Scenario 2
(s2) |
Scenario 3
(s3) |
Scenario 4
(s4) |
TechGen | 48 | 35 | 22 | 15 |
InnovateCorp | 32 | 40 | 45 | 53 |
- Set up the opportunity loss table based on the provided payoff figures.
- Create a decision tree illustrating the decision-making process for Samantha’s investment. You may use any software for making the tree diagram, but a handwritten snapshot will be unacceptable.
In making of this tree show the payoff values given above only.
iii. According to Rahul Kapoor’s latest research, he has assigned the following probabilities to the four scenarios (states of nature):
- P(S1) = 0.3
- P(S2) = 0.4
- P(S3) = 0.2
- P(S4) = 0.1
Determine the Expected Monetary Value (EMV) decision based on the probabilities assigned by Rahul. (10 Marks)
Ans 2.
Introduction
Making informed decisions in stock investments requires careful consideration of various scenarios and their associated potential payoffs. Samantha Patel, an analyst at a prominent technology firm, is considering investing in shares from two companies, TechGen and InnovateCorp. Given the volatile nature of the stock market, understanding the expected outcomes based on different economic conditions can significantly aid in decision-making. To assist Samantha, an opportunity loss table, a decision tree, and the calculation of the Expected Monetary Value (EMV) will be developed. These tools will not only visualize possible outcomes and their likelihoods but also quantify the expected returns, helping Samantha make a more data
- Using the following data and analyze in EXCEL.
Year | Rice (Lakh
hectares) |
Wheat
(Lakh hectares) |
Coarse
Cereals (Lakh hectares) |
Pulses
(Lakh hectares) |
1966-67 | 353 | 128 | 451 | 221 |
1967-68 | 364 | 150 | 473 | 227 |
1968-69 | 370 | 160 | 462 | 213 |
1969-70 | 377 | 166 | 472 | 220 |
Year | Rice (Lakh
hectares) |
Wheat
(Lakh hectares) |
Coarse
Cereals (Lakh hectares) |
Pulses
(Lakh hectares) |
1970-71 | 376 | 182 | 460 | 225 |
1971-72 | 378 | 191 | 436 | 222 |
1972-73 | 367 | 195 | 422 | 209 |
1973-74 | 383 | 186 | 462 | 234 |
1974-75 | 379 | 180 | 432 | 220 |
1975-76 | 395 | 205 | 438 | 245 |
1976-77 | 385 | 209 | 419 | 230 |
1977-78 | 403 | 215 | 423 | 235 |
1978-79 | 405 | 226 | 422 | 237 |
1979-80 | 394 | 222 | 414 | 223 |
1980-81 | 402 | 223 | 418 | 225 |
1981-82 | 407 | 221 | 425 | 238 |
1982-83 | 383 | 236 | 404 | 228 |
1983-84 | 412 | 247 | 417 | 235 |
1984-85 | 412 | 236 | 392 | 227 |
Year | Rice (Lakh
hectares) |
Wheat
(Lakh hectares) |
Coarse
Cereals (Lakh hectares) |
Pulses
(Lakh hectares) |
1985-86 | 411 | 230 | 395 | 244 |
1986-87 | 412 | 231 | 397 | 232 |
1987-88 | 388 | 231 | 366 | 213 |
1988-89 | 417 | 241 | 387 | 232 |
1989-90 | 422 | 235 | 377 | 234 |
1990-91 | 427 | 242 | 363 | 247 |
1991-92 | 427 | 233 | 334 | 225 |
1992-93 | 418 | 246 | 344 | 224 |
1993-94 | 425 | 252 | 328 | 223 |
1994-95 | 428 | 257 | 322 | 230 |
1995-96 | 428 | 250 | 309 | 223 |
1996-97 | 434 | 259 | 318 | 225 |
1997-98 | 435 | 267 | 308 | 229 |
1998-99 | 448 | 275 | 293 | 235 |
1999-00 | 452 | 275 | 293 | 211 |
Year | Rice (Lakh
hectares) |
Wheat
(Lakh hectares) |
Coarse
Cereals (Lakh hectares) |
Pulses
(Lakh hectares) |
2000-01 | 447 | 257 | 303 | 204 |
2001-02 | 449 | 263 | 295 | 220 |
2002-03 | 412 | 252 | 270 | 205 |
2003-04 | 426 | 266 | 308 | 235 |
2004-05 | 419 | 264 | 290 | 228 |
2005-06 | 437 | 265 | 291 | 224 |
2006-07 | 438 | 280 | 287 | 232 |
2007-08 | 439 | 280 | 285 | 236 |
2008-09 | 455 | 278 | 275 | 221 |
2009-10 | 419 | 285 | 277 | 233 |
2010-11 | 429 | 291 | 283 | 264 |
2011-12 | 440 | 299 | 264 | 245 |
2012-13 | 428 | 300 | 248 | 233 |
2013-14 | 440 | 312 | 257 | 252 |
2014-15 | 439 | 310 | 242 | 231 |
Year | Rice (Lakh
hectares) |
Wheat
(Lakh hectares) |
Coarse
Cereals (Lakh hectares) |
Pulses
(Lakh hectares) |
2015-16 | 435 | 304 | 244 | 249 |
2016-17 | 440 | 308 | 250 | 294 |
2017-18 | 438 | 297 | 243 | 298 |
2018-19 | 442 | 293 | 221 | 292 |
2019-20 | 437 | 314 | 240 | 280 |
2020-21 | 458 | 311 | 241 | 288 |
2021-22 | 463 | 305 | 227 | 307 |
2022-23 | 477 | 318 | 236 | 291 |
Data source: RBI
- Which pattern is visible in all the crops across these many years? Suggest appropriate chart for this pattern detection task. (5 Marks)
Ans 3a.
Introduction
Analyzing agricultural data across several decades provides insights into the cropping patterns and trends which are crucial for policy making and strategic agricultural planning. The data from RBI on crop cultivation area across different years for rice, wheat, coarse cereals, and pulses allows
- Identify two pairs of combination of the crops having negative correlations? Which graph will help you to detect that? provide that graph also. (5 Marks)
Ans 3b.
Introduction
Exploring correlations between different crops’ cultivation areas can uncover relationships that might indicate competitive or complementary planting strategies among farmers. Identifying pairs of crops with negative correlations helps in understanding how the increase in the area of one crop might coincide with the decrease in another, possibly reflecting shifts in farmer preferences or market demands over ti