Data on grades of students who did and did not attend class regularly. What are the mean and median scores of those two groups of students? What do they suggest about the value of attending class? Attended class 241 243 246 249 250 252 254 254 255 256 261 262 263 264 264 264 265 267 267 270 271 272 273 276 276 277 278 278 280 281 282 284 288 288 290 291 291 292 293 294 296 296 297 298 310 320 321 328 Skipped class 188 195 195 225 228 232 233 237 239 240 250 256 256 256 261 264 264 268 270 270 274 274 277 308
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
- Data on grades of students who did and did not attend class regularly. What are the mean and median scores of those two groups of students? What do they suggest about the value of attending class?
Attended class 241 243 246 249 250 252 254 254 255 256
261 262 263 264 264 264 265 267 267 270
271 272 273 276 276 277 278 278 280 281
282 284 288 288 290 291 291 292 293 294
296 296 297 298 310 320 321 328
Skipped class 188 195 195 225 228 232 233 237 239 240
250 256 256 256 261 264 264 268 270 270
274 274 277 308
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