The first 10 students who arrived for the friday lecture filled out a questionnaire on their attitudes toward the instructor. the first 10 who were late for the lecture were spotted and afterward filled out the same questionnaire. the appropriate design for testing the significance of the difference between the means is

Independent-samples t-test

Step-by-step explanation:

It is is an inferential statistical test that determines whether there is a statistically significant differences.

The Independent Samples t Test is commonly used to test the following:

1. Statistical differences between the means of two groups.

2. Statistical differences between the means of two interventions. (As it is, in the above question)

3. Statistical differences between the means of two change scores

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

step-by-step explanation:

infinity is the answer