<span>1.) The most important thing that must be true about a sample so that you can make a valid inference about the population is that the sample must not be biased.
2.) </span>I<span>t is important to take a random sample of the population you want to study because the population may be too large that it might be impossible or too expensive to conduct a survey on a population.
3.) </span><span>An outlier is an observation point that is distant from other observations. It can be too small or too big compared to other observations.</span>
The measure of center that is more affected by outliers in the data is the mean, because since the mean is obtained by the sum of the data divided by the number of the data set. Any 'too big' number or 'too small' number will affect the sum of the data set.
4.) Given that <span>Sam
conducted a survey to find out the favorite weekend activity of the
students his middle school. He asked 20 of his classmates. He found out
that the favorite weekend activity of his middle school is playing
video games because 75% of the students he surveyed liked to play video
games.
</span><span>Sam’s sample may not be valid because he drew a sample only from his class to make an inference about the entire middle school students.
</span>For <span>Sam to improve his survey to be more representative of his school he must draw a random sample from all the classes that make up the middle school.</span>
Answer:
99inches
Step-by-step explanation:
The ratio of the sides of a triangle =2:4:9.
perimeter = 165 inches,
Total ratio= 2+4+9=15
perimeter = 165
Divide the perimeter by total ratio
165/15=11
Each of the sides
= (2×11) =22
(4×11) =44
(9×11)=99
the length of the longest side= 99inches
Heyo!
(a - 6)2
Multiply each term in the parenthesis by 2
2a - 6 × 2
Multiply the numbers
Your answer is
2a - 12
I would recommend "Introduction to Linear Algebra," by Gilbert Strang. It is a compact but very helpful textbook reference written by a well-known MIT professor. There is a corresponding online MIT course that is free, so that's a bonus. I am currently using it to study linear algebra with no class or previous experience, and I think it does a solid job of explaining things. Each section in the book has a set of questions for you to work through, and answers to selected questions appear in an appendix at the end of the book.
Hope this helps!
