Question 1168892
You're doing very well! Let's review each of your answers:

**6. Fred's Biology Z-score:**

* Z = (X - μ) / σ
* Z = (92 - 89) / 4
* Z = 3 / 4
* Z = 0.75

* **You are correct!**

**7. Fred's Criminology Z-score:**

* Z = (X - μ) / σ
* Z = (87 - 83) / 6
* Z = 4 / 6
* Z = 0.6666... (approximately 0.67)

* **You are correct!**

**8. Fred's Relative Performance:**

* Fred's z-score in biology (0.75) is higher than his z-score in criminology (0.67).
* A higher z-score indicates a better relative performance.

* **You are correct!** Fred performed better in biology.

**9. Type I Error:**

* A Type I error occurs when you reject a true null hypothesis.

* **You are correct!**

**10. Researcher's Error:**

* The researcher concluded there was a difference when, in reality, there was none. This means they rejected a true null hypothesis.

* **You are correct!** It's a Type I error.

**11. Z-test Requirements:**

* For a z-test, you need the population mean and the population standard deviation.

* **You are correct!** Your answer of "information" is a little too broad, but you correctly identified "standard deviation". The more precise answer is population mean and population standard deviation.