Tina collected data from a random sample of 600 students in her university asking whether or not they exercise more than 30 minutes per day. Based on the results, she reports that 53% of the students in the nation exercise more than 30 minutes per day. Why is this statistic misleading?

The sample is biased.

Explanation:

In this case the sample is biased. The individuals included in the survey are not representative of the general population, as their school students do not generally have the same workout patterns as the entire population of national students.

Tina collected data from a random sample of 600 students in her university asking whether or not they exercise more than 30 minutes per day. Based on the results, she reports that 53% of the students in the nation exercise more than 30 minutes per day. Why is this statistic misleading?

This statistic is misleading because Tina collected a university data and then made her conclusion based on a wrong population sample, that is, the nation.

Step-by-step explanation:

Based on the information given in the question, it is observed that her sample population was 600 university students, but the report of her study indicates vividly that she made her conclusion based on a wrong population sample, that is, the nation.

Therefore, the sample is biased, and the result obtained by her is misleading.

Step-by-step explanation:

A quadratic equation is an equation with at least one squared term. The most common form of a quadratic equation is ax^2 + bx + c, where a, b, and c are coefficients (numbers). The graph of a quadratic equation is a parabola. If a in ax^2 + bx + c is positive, then the graph looks like a U-shape. However, if a is negative, the its graph looks like an upside-down U-shape.  

Here, the equation y=x^2-9 is a quadratic equation because it has the term x^2, which qualifies the requirement of having at least one squared term to be considered a quadratic equation. To find the root, simply set y = 0, i.e. set (x^2-9) = 0. This means x^2 = 9, which means x = 3 or x = -3. (these are the roots of y=x^2-9).