Answer:
The image shows a stationary train indicated by letter A and a moving train, indicated by letter B. If the person standing at the train station hears sounds coming from both trains, which explanation best predicts tThe image shows a stationary train indicated by letter A and a moving train, indicated by letter B. If the person standing at the train station hears sounds coming from both trains, which explanation best predicts t
Step-by-step explanation:
Answer:
A sample size of at least 87 will be needed.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find M as such
In which 
is the standard deviation of the population and n is the size of the sample.
In this problem, we have that:
So
A sample size of at least 87 will be needed.
Hello!
Convert the percentages to decimals by dividing them by 100, and then multiply them by the amount of boys and girls.
53 ÷ 100 = 0.53 as a decimal
0.53 × 300 girls = 159
This means that 159 of the 300 girls play sports.
Repeat this to calculate how many boys play sports.
39 ÷ 100 = 0.39
0.39 × 500 = 195
This means that 195 out of the 500 boys play sports.
Final Answer:
More boys play sports than girls.
Answer:
14 is D but I don't 15 question answer
