100 ! which of these numbers are irrational?

Sorry don't know full answer but I know this: In mathematics, an irrational number is a real number that cannot be expressed as a ratio of integers, i.e. as a fraction. Therefore, irrational numbers, when written as decimal numbers, do not terminate, nor do they repeat.

Step-by-step explanation:

your answer would be D ( i had recently took a test on this and these are easy questions well if you have an algebra book its more easy but i hope this helps you pass!)

Step-by-step explanation:

1. C) stemplot with a large outlier

The large outlier will skew the data to make it nonnormal. A moderate skew isn't as bad as a large one, so choice A is a fairly safer choice to go with in terms of using the T procedure. The size of the standard deviation does not affect the normality of the distribution.

2. A) Teacher comparing pre-test and post-test results

A matched pairs design is basically a before and after sort of thing, most of the time anyway. Each person's pre-test score is paired up with their post-test score to see if any significant improvement has been made. This is also known as a paired T test

3. C) You may use the t procedure, provided your sample size is large, say at least fifty.

Some textbooks say n > 30 is sufficient. It will depend on the textbook and your teacher of course. The idea is that if n is large enough, then by the CLT (central limit theorem), the distribution of sample means will be approximately normal, which allows you to use the T procedure and T distribution even if the underlying distribution may not be normal and/or skewed.