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4 years ago

WILLL GIVE A BRAINLEST

Mathematics

2 answers:

lord [1]4 years ago

5 0

It is B. simple random sample

Mama L [17]4 years ago

4 0

Answer:

B. simple random sample

Step-by-step explanation:

The company randomly selects 100 customers and asks them about their level of satisfaction with the company. Therefore, the method used here is simple random sample

A simple random method is described as a random selection of few people from a majority or a whole population. These few samples represent the whole population. Moreover in a random sampling, each person has an equal chance to participate as its random and no one knows who will be selected. Random sampling is one of the best and non biased sampling methods to conduct any survey.

The cluster sampling is wrong as this form requires groups but here the company has not grouped people. This cannot either be stratified as in stratified sampling, sub-populations are considered and here it is not considered. In convenience sampling, the closest persons are surveyed which is not the case here. So, these 3 options are wrong.

Only simple random sampling is the correct option.

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4 years ago

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3 years ago

Scott made 3 identical necklaces, each having beads and a pendant. The total cost of the beads and pendants for all 3 necklaces

pantera1 [17]

Answer:

$2.90

Step-by-step explanation:

Lets look at the information given:

Scott made 3 necklaces

$14.40 is the cost for both the beads and pendants for all 3 necklaces

$5.70 was the cost of just beads for all 3 necklaces

Each necklace has 1 pendant

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$14.40 - $5.70= $8.70

Now we know that cost for the 3 pendants for all 3 necklaces was $8.70, but we need to find how much EACH pendant costs. To find out, we simply divide the total cost for all 3 pendants by 3:

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3 years ago

You make a scale drawing of a tree using the scale 5 in. =27 ft. If the tree is 67.5 ft tall, how tall is the scale drawing?

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5in. 27ft
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3 years ago

The countries of Europe report that 46% of the labor force is female. The United Nations wonders if the percentage of females in

Anestetic [448]

Answer:

a) Point estimate p=0.43.

b) The 95% confidence interval for the population proportion of female workers in US is (0.388, 0.473).

c) This confidence interval tells us that, with 95% confidence, the true proportion of females in the U.S. labor force is within 0.388 and 0.473.

d) We can conclude that females do not make up a majority of the US labor force, because we can claim, with 95% confidence, that the true proportion of female workers is under 0.473, which is below 0.5 (or 50%).

Step-by-step explanation:

a) A point estimate can be calculated using the sample results and dividing the amount of female workers in the sample by the sample size:

$p=X/n=226/525=0.43$

b) We have to calculate a 95% confidence interval for the proportion.

The standard error of the proportion is:

$\sigma_p=\sqrt{\dfrac{p(1-p)}{n}}=\sqrt{\dfrac{0.43*0.57}{525}}\\\\\\ \sigma_p=\sqrt{0.000467}=0.022$

The critical z-value for a 95% confidence interval is z=1.96.

The margin of error (MOE) can be calculated as:

$MOE=z\cdot \sigma_p=1.96 \cdot 0.022=0.042$

Then, the lower and upper bounds of the confidence interval are:

$LL=p-z \cdot \sigma_p = 0.4305-0.042=0.388\\\\UL=p+z \cdot \sigma_p = 0.4305+0.042=0.473$

The 95% confidence interval for the population proportion of female workers in US is (0.388, 0.473).

c) This confidence interval tells us that, with 95% confidence, the true proportion of females in the U.S. labor force is within 0.388 and 0.473.

If the confidence interval have included the value 0.5, we could not be sure (with 95% confidence) that female workers do not represent de majority, as there would be possibility that the true proportion is 0.5.

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4 years ago