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Troyanec [42]
3 years ago
10

A researcher reports that the standard deviation in population is A is q= 2.3 and the standard deviation in population B is q=4.

3. Which population is associated with the highest power to detect an effect?
Mathematics
1 answer:
Debora [2.8K]3 years ago
4 0

Answer:

Population A

Step-by-step explanation:

Usually in statistics, the more we increase the sample size, the more the standard deviation decreases. Similarly, the more we decrease the sample size, the more the standard deviation increases.

Finally, the more the standard deviation or error of Variance the lesser the power to detect an effect.

In this question, Population B has a greater standard deviation and thus would not have as much power as Population A in detecting an effect.

Thus Population A with standard deviation of 2.3 will have highest power to detect an effect.

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The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.25. If the probability that
ICE Princess25 [194]

Answer:

The probability that event B will occur is 0.45

Step-by-step explanation:

Given;

probability that event A occurs, P(A) = 0.4

the probability that events A and B both occur, P(A ∩ B) = 0.25

the probability that either event A or event B occurs, P(A ∪ B) = 0.6

To determine the probability that event B will occur, we use probability addition rule;

P(A) + P(B) = P(A ∩ B) + P(A ∪ B)

0.4 + P(B) = 0.25 + 0.6

0.4 + P(B) = 0.85

P(B) = 0.85 - 0.4

P(B) = 0.45

Therefore, the probability that event B will occur is 0.45

4 0
3 years ago
Order the numbers from least to greatest.<br> 23% , 1/4 , 0.225 .
Alla [95]
0.225, 23%, 1/4


Step my step

23% = 0.23
1/4 = 0.25
3 0
3 years ago
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. Use the circle graph sh
mel-nik [20]

Answer: 500 people

Step-by-step explanation:

Let there are x people in the survey.

According to the question,

People who like football as their favorite sports = 42 % of x = 0.42 x

People who like baseball as their favorite sports = 33 % of x = 0.33 x

People who like soccer as their favorite sports = 25 % of x = 0.25 x

But, 210 people said football was their favorite sport.

⇒ 0.42 x = 210

⇒ 42 x = 21000

⇒ x = 500

Therefore, there are 500 people in the survey.


4 0
3 years ago
Read 2 more answers
A metallurgist has an alloy with 5% titanium and an alloy with 30% titanium. He needs 100 grams of an alloy with 15% titanium. H
andrey2020 [161]
Let us convert the percentages to decimal format first.. so 5% is just 5/100 or 0.05 and 15% is just 15/100 or 0.15

so hmmm, so, let's say it needs "x" amount and "y" amount of each respectively, so, whatever "x" and "y" are, they must add up to 100, and whatever their concentration is, must add up to what the mixture yields

thus

\bf \begin{array}{lccclll}&#10;&amount&concentration&&#10;\begin{array}{llll}&#10;concentrated\\&#10;amount&#10;\end{array}\\&#10;&-----&-------&-------\\&#10;\textit{5\% alloy}&x&0.05&0.05x\\&#10;\textit{30\% alloy}&y&0.30&0.3y\\&#10;-----&-----&-------&-------\\&#10;mixture&100&0.15&15&#10;\end{array}&#10;\\\\\\&#10;\begin{cases}&#10;x+y=100\implies \boxed{y}=100-x\\&#10;0.05x+0.3y=15\\&#10;----------\\&#10;0.5x+0.3\left( \boxed{100-x} \right)=15&#10;\end{cases}

solve for "x"

what's "y"? well, y = 100 - x
4 0
3 years ago
What is 2223810294+ 55367457 + 23523546?
andrezito [222]
2223810294 + 55367457 + 23523546 = 2302701297
3 0
3 years ago
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