How do you generate a representative sample

Mathematics

1 answer:

bearhunter [10]3 years ago

4 0

Answer:

Using stratified random sampling, researchers must identify characteristics, divide the population into strata, and proportionally choose individuals for the representative sample. In general, the larger the population target to be studied the more difficult representative sampling can be

Step-by-step explanation:

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An express train and car leave Los Angeles at the same time and head for Merced 280 miles away. The rate of the train is twice t

larisa86 [58]

Now, recall your d = rt, or distance = rate * time

so.. the train and the car, both leave LA, and go to Merced, which is 280miles away.....alrite, the train is going twice as fast as the car is, so, if the car is going "r" fast, then the train is going 2*r or 2r fast

now, the train arrives 4hrs earlier than the car, so, if the car took "t" time to arrive, the train took then t-4

now, both, arrived at Merced, that means, the distance covered by each, is 280miles

thus $\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
train&280&2r&t-4\\
car&280&r&t
\end{array}
\\\\\\
\begin{cases}
280=2r(t-4)\\\\
280=rt\implies \cfrac{280}{r}=\boxed{t}\\
----------\\
280=2r\left( \boxed{\cfrac{280}{r}}-4 \right)
\end{cases}$

solve for "r"

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3 years ago

Pizza House offers 3 different salads, 7 different kinds of pizza, and 4 different desserts. How many different three-course mea

Dmitrij [34]

Answer is 36. Hope this helps.

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3 years ago

Simplify 8 over negative 4 ÷ negative 3 over 9 . (5 points)

Svetach [21]

Answer:

Step-by-step explanation:

$-\frac84 divided-\frac39\\-2 divided- \frac13\\-2 \cdot -3\\6$