Answers:
- a) Stratified random sampling, or simply stratified sampling. Each group individually is known as a stratum. The plural is strata. The key here is that each stratum is sampled, though we don't pick everyone from every stratum. We randomly select from each unit to have them represent their unit. Think of it like house of representative members that go to congress. We have members from every state, but Be sure not to mix this up with cluster sampling. Cluster sampling is where we break the population into groups or clusters, then we randomly select a few clusters in which every individual from those clusters is part of the sample.
- b) Simple random sampling (SRS). This is exactly what it sounds like. We're randomly generating numbers to help determine who gets selected. Think of it like a lottery. A computer is useful to make sure this process is quick, efficient and unbiased as possible. Though numbers in a box or a hat work just as well.
For each of the methods mentioned, they aren't biased since they have randomness built into their processes.
She has read 59% of the book so far, you simply divide and get a decimal which you round to
The error Kevin made was in step 2 when he added before he multiplied.
<h3>What error did Kevin make?</h3>
This question would be solved using the BODMAS rule. The BODMAS rule provides the order in which mathematical problems should be solved. The order is:
- bracket
- of
- division
- multiplication
- addition
- subtraction
- Step 1 : 75 - 6 x 2 + 3
- Step 2: 75 - 12 + 3
- Step 3 : 75 - 9
- Step 4: 66
To learn more about addition, please check: brainly.com/question/349488
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Refer to the diagram shown below.
h = the height of the house.
Apply the Pythagorean theorem to obtain
h² + 25² = (25√5)²
h² + 625 = 3125
h² = 3125 - 625 = 2500
h = √(2500) = 50 ft
Answer: The height is 50 ft.