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pishuonlain [190]
2 years ago
12

What are these two answers,explanation needed

Mathematics
2 answers:
Korolek [52]2 years ago
5 0
1. Should be -15
2. Should be 4
Stella [2.4K]2 years ago
3 0

Step-by-step explanation:

1) k(x)= -3x²-3

k (-2)= -3×(-2)²-3

= -12-3

= -15

3)k(a)=a+4

k(0)= 0+4=4

hope it helps.

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which of the following is an example of stratified sampling? in order to assess students' satisfaction with the food establishme
Serhud [2]

The example of stratified sampling is a health educator wanted to study the sleeping habits of the undergraduate students in her study.

For her study, the researcher chose a simple random sample of size 150 from each of the classes (150 freshmen, 150 sophomores, 150 juniors, and 150 seniors) for a total of 600 sampled students. a poll asked a random sample of 1,112 adults whether they believe that the use of marijuana for medical reasons should be legalized.

<u>Sampling:</u>

In statistics, quality assurance, and research methodologies, sampling is the selection of a subset of individuals (statistical sample) from a statistical population in order to estimate characteristics of the population as a whole. A statistician tries to collect a representative sample of the population in question. Sampling is less costly than measuring the entire population, provides faster data collection, and can provide insight when the entire population cannot be measured.

<u>Stratified Sampling:</u>

When the population embraces a number of distinct categories, the frame can be organized by these categories into separate "strata." Each stratum is then sampled as an independent sub-population, out of which individual elements can be randomly selected. The ratio of the size of this random selection (or sample) to the size of the population is called a sampling fraction. There are several potential benefits to stratified sampling.

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First, identifying strata and implementing such an approach can increase the cost and complexity of sample selection, as well as leading to increased complexity of population estimates.

Second, when examining multiple criteria, stratifying variables may be related to some, but not to others, further complicating the design, and potentially reducing the utility of the strata.

Finally, in some cases (such as designs with a large number of strata, or those with a specified minimum sample size per group), stratified sampling can potentially require a larger sample than would other methods (although in most cases, the required sample size would be no larger than would be required for simple random sampling).

Learn more about Stratified Sampling:

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#SPJ4

4 0
1 year ago
Help me please if you can
tekilochka [14]

Answer:

<D=<J

Step-by-step explanation:

The first answer is the only correct statement. In geometry, congruent angles are shown through the number of arcs on the vertex of an angle. For example, if two different angles both had three arcs on the vertex, then those two angles are congruent. In this figure, both <D and <J have 4 arcs, which means they are congruent. Additionally, both angles are opposite of a line that measures 25 inches. If two angles are opposite of congruent lines, then the angles are also congruent.

3 0
3 years ago
What is the Inter quartile Range <br> 5, 36, 15, 31
Greeley [361]

Answer:

The interquartile range would be 23.5.

3 0
3 years ago
Help meee i need the X and what the angles are
algol13

Answer:

x will be 120 degrees

Step-by-step explanation:

I will loves easy questions!

6 0
3 years ago
Write a whole number and a fraction greater than 1 to name the part filled.Think : 1 container = 1
kykrilka [37]
Alright.....so..... well the 
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I am not a 100% sure but try another source also<span />
8 0
3 years ago
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