All Statistical Tests,such as Calculation of the Mean and Standard

question 8

Multiple Choice

All statistical tests,such as calculation of the mean and standard error of the sampling distribution can be calculated and are valid under the following condition(s) :

• A) the population is normal and the sample is any size
• B) the population has an unknown distribution and the sample size is at least 30
• C) both a and b
• D) either a or b

---

Definitions:

Keratometer

An instrument used to measure the curvature of the anterior surface of the cornea, particularly in determining the degree of astigmatism.

Exophthalmometer

An instrument used to measure the degree of forward displacement of the eyeball, as seen in conditions like Graves' disease.

Tonometer

An instrument used to measure the pressure inside the eye, important in glaucoma diagnosis.

Macular Degeneration

A progressive eye condition affecting the macula (part of the retina) that leads to vision loss.