A Student Asked a Statistics Professor If Grades Were Marked

question 63

Multiple Choice

A student asked a statistics professor if grades were marked "on the curve." The professor decided to give the student a project to determine if last year's statistics grades were normally distributed. The professor told the student that last year's mean mark was 70 with a standard deviation of 10 and to use the following results. Using the data from this Mega stat printout, you determine:

• A) the letter grades are evenly distributed when tested at the 0.05 level of significance.
• B) the letter grades are not normally distributed when tested at the 0.01 level of significance.
• C) the letter grades are normally distributed when tested at the 0.05 level of significance.
• D) the letter grades are not normally distributed when tested at the 0.05 level of significance.
• E) the letter grades are not normally distributed when tested at either the 0.01 or 0.05 level of significance.

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Definitions:

Bromecresol Purple

A chemical pH indicator that changes color at a pH range of 5.2 to 6.8, used in various laboratory and medical tests.

Adhesion

The tendency of dissimilar particles or surfaces to cling to one another, often causing materials to stick together.

Hydrogen Bonds

Weak bonds between partially positive hydrogen atoms and partially negative elements like oxygen or nitrogen, crucial in biological structures.

pH Scale

A measure of the acidity or basicity of an aqueous solution, ranging from 0 (most acidic) to 14 (most basic) with 7 as neutral.