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Alex_Xolod [135]
2 years ago
11

At Central High School, 28% of the students are Freshmen, 26% are Sophomores, 24% are Juniors, and 22% are Seniors. The student

manager of the school newspaper would like to conduct a survey to estimate the proportion of each class that plans to attend the upcoming Football game. She suggests surveying a random sample of 100 students, but specifically by selecting random samples of 28 Freshmen, 26 Sophomores, 24 Juniors, and 22 Seniors. Which of the following is a true statement about this sampling procedure?a. This is simple random sample because student of every class has equal number of chances to be selectedb. This cluster random samplec. This is convenience sample as only 100 students are surveyed, which is a manageable sized. This is a stratified random sample because a separate random sample is selected from each class
Business
1 answer:
gregori [183]2 years ago
6 0

Answer:

This is a stratified random sample because a separate random sample is selected from each class

Explanation:

Stratified random sampling is an appropriate method when the population consists of mixed characteristics and you would like to ensure that every characteristic is proportionally represented in the sample. In this example, the population is the students from Central High School and the mixed characteristics are the different classes such as Freshman students, Sophomore students, Juniors and Seniors.

After the population is divided into subgroups based on characteristics, from the overall proportion of the population, you calculate how many people should be sampled in each subgroup. Random or systematic sampling can then be used to select a sample from each subgroup.

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Answer:

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6 0
2 years ago
6. Twins Barbara and Mary are both age 27. Beginning at age 27, Barbara invests $2,000 per year for 10 years and then never sets
Dmitriy789 [7]

Answer:

Barbara will have $210,349

Mary will have $188,922

Explanation:

Total time of investment is 40 years = age 67 - age 27

After 10 years, Barbara will have  $27,633 (this figure used "FV" calculation in excel = FV(7%,10,2000)

Then Barbara put all $27,633 in next 30 years then she will have $210,349 = 27,633 x (1+7%)^30

Mary didn't now invest in first 10 years, but then  invests $2,000 per year for the next 30 years, so she will have $188,922 = FV(7%,30,2000)

4 0
3 years ago
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7 0
3 years ago
Jenna isn’t sure if she should buy an extended warranty for her new laptop. Use the PACED decision-making process to help her de
Vladimir79 [104]
Problem: 
Buy extended warranty for $950 laptop or not?

Alternative:
1) Buy extended warranty
2) Not buy extended warranty

Criteria:
Practical and cost saving in the long-run

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       con:<span> pay additional $99. </span>
       pro: <span>5 year warranty coverage. </span>
       pro: repairs may be done at a local store

2) Not buy extended warranty
       pro&con: laptop comes with one-year limited warrant
       pro: no additional payment
       con: repairs will be done by manufacturer 
<span>       con: repair costs range from $50 to $450
</span>
Decision:
BUY EXTENDED WARRANTY
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3 years ago
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3 years ago
Read 2 more answers
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