Z-Scores and Turtle Weights

This video tutorial covers normal model problems using sea turtles as examples. It explains how to calculate proportions of sea turtles above or below a certain weight using z-scores and the normalcdf function on a calculator. The tutorial also demonstrates how to find the standard deviation from given proportions using the invert norm function. The video concludes with a complex problem that combines all the learned concepts, emphasizing the symmetry of the normal model.

What is the mean weight of adult green sea turtles as mentioned in the video?

• 300 pounds

• 390 pounds

• 330 pounds

• 360 pounds

What is the standard deviation of the weight of adult green sea turtles?

• 20 pounds

• 25 pounds

• 30 pounds

• 35 pounds

Which calculator function is used to find proportions in a normal distribution?

• binomcdf

• normalpdf

• invNorm

• normalcdf

What is the z-score for a green sea turtle weighing 357 pounds?

• 1.0

• 0.7

• 0.8

• 0.9

What is the probability that a green sea turtle weighs more than 357 pounds?

• 0.1841

• 0.2841

• 0.3841

• 0.4841

What is the z-score for a green sea turtle weighing 265 pounds?

• -2.1667

• -1.1667

• 0.1667

• -0.1667

What is the probability that a green sea turtle weighs less than 265 pounds?

• 0.0251

• 0.0151

• 0.0351

• 0.0451

What is the mean weight of loggerhead sea turtles?

• 365 pounds

• 375 pounds

• 385 pounds

• 395 pounds

What proportion of loggerhead sea turtles weigh over 400 pounds?

• 0.50

• 0.35

• 0.40

• 0.45

Which calculator function is used to find the z-score from a given proportion?

• binomcdf

• normalpdf

• normalcdf

• invNorm