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Lesson 6.4: Confidence Intervals Workbook 6B 3. In ecology, the term "abundance" refers to the number of individual animals seen over a period of time at a particular location. The following diagram represents estimates of the eastern north Pacific gray whale based on sightings from a research station in California Gray Whale Abundance Predicted from Sightings at Granite Canyon Research Station 30 000- 25 000- 20 000- Abundance 15 000_ 10 000- 1970 1980 1990 2000 Year NOAA Research a. Explain how this diagram can be interpreted. b. Can you say that the gray whale abundance was higher in 1970 than in 1971? Explain. c. Is the statement "gray whale populations have been estimated as high as 22 000 in 2008" a reasonable interpretation of the diagram? elgroo oved boy ADLC Mathematics 20-2 13Unit 6: Statistics Final Review Assignment Workbook 6B Unit 6: Statistics Final Review Assignment 12 1. U2 is an Irish band that has been popular for over three decades. The lengths of 80 of their songs were selected at random and are listed in the table below. Lengths of Randomly Selected U2 Songs (seconds) 382 222 214 338 310 559 334 225 177 189 278 300 295 254 331 94 225 294 245 292 262 219 384 336 312 281 308 285 227 258 331 418 195 338 255 225 43 331 179 230 215 252 272 228 28 274 229 178 173 319 267 280 56 186 341 204 253 317 303 337 308 240 252 349 347 94 44 187 272 208 279 276 264 270 286 205 350 444 294 260 . Use 50-second intervals to make a frequency distribution table for the data. Song Length(s) Frequency ADLC Mathematics 20-2