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ioda
3 years ago
10

A statistical procedure used to determine whether observed frequencies at each level of one categorical variable are similar to

or different from frequencies expected, is called the chi-square:
Mathematics
1 answer:
Maslowich3 years ago
4 0

Answer:

<h2>This statement is true.</h2>

In statistics, the chi-square test is used to prove a specific hypothesis, accepting or rejecting the null one. In order to find enough evidence to prove the hypothesis, we compare two group of frequencies, which belongs to two different groups (like a quasi-experimental design, with a control and experimental group). The researcher have set an expected frequency, based on the hypothesis, and then he/she will observe a frequency from the data recollected.

Therefore, by comparing this two frequencies (the expected with the observed), the researcher is able to demonstrate the hypothesis.

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The function ƒ(x) = (x − 1)^2 + 5 is not one-to-one. Find a portion of the domain where the function is one-to-one and find an i
melisa1 [442]

Answer:

f(x)=(x-1)^2+5 with domain x>1 and range y>5 has inverse g(x)=sqrt(x-5)+1 with domain x>5 and range y>1.

Step-by-step explanation:

The function is a parabola when graphed. It is in vertex form f(x)=a(x-h)^2+k where (h,k) is vertex and a tells us if it's reflected or not or if it's stretched. The thing we need to notice is the vertex because if we cut the graph with a vertical line here the curve will be one to one. So the vertex is (1,5). Let's restrict the domain so x >1.

* if x>1, then x-1>0.

* Also since the parabola opens up, then y>5.

So let's solve y=(x-1)^2+5 for x.

Subtract 5 on both sides:

y-5=(x-1)^2

Take square root of both sides:

Plus/minus sqrt(y-5)=x-1

We want x-1>0:

Sqrt(y-5)=x-1

Add 1 on both sides:

Sqrt(y-5)+1=x

Swap x and y:

Sqrt(x-5)+1=y

x>5

y>1

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3 years ago
Statistics when mode is best measure of central tendency.
ehidna [41]

Answer:

The mode is the least used of the measures of central tendency

Step-by-step explanation:

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Please help need asap
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Answer:

the answer is c

Step-by-step explanation:

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2 years ago
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Molly walked 3.45 miles on a hike. her sister walked 1.23 miles. her brother walked 0.85 miles. how much farther did molly walk
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The answer is B......
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At Macon County High School, a classroom is 400 ft2. After the teacher sets up her desk, computer, and podium, there are 250 ft2
tigry1 [53]
Ok so
250 left for student desks
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but, the teacher has 1 desk also so add 1
31+1=32
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