A Study Was Designed to Investigate the Effects of Two

question 168

Multiple Choice

A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 470 with a standard deviation of 20 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 430 and 510?

• A) at least 89%
• B) at least 75%
• C) approximately 68%
• D) approximately 95%

---

Definitions:

Camber

The angle of a vehicle's wheels in relation to the ground, affecting stability and tire wear.

Toe

In automotive terms, the angle at which the wheels of a vehicle tilt inward or outward from a vertical position, affecting steering and tire wear.

Dampers

Components of a vehicle's suspension system designed to absorb and dampen shock impulses to provide a smoother ride.

Bounce Test

A quick diagnostic procedure used to check the suspension and shocks of a vehicle, where pressure is applied to the body and released to observe how the vehicle rebounds.