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2 years ago

Identify the type of sample and whether it is a biased or unbiased sampling method.

Mathematics

1 answer:

iris [78.8K]2 years ago

4 0

Answer:

1. biased

2. unbiased

3. unbiased

4. biased

5. unbiased

Step-by-step explanation:

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2 to the power of negative 2

olganol [36]

2^-2 would become 1/2^2 which becomes 1/4.

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2 years ago

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Height, in meters, is measured for each person in a sample. After the data are collected, all the height measurements

charle [14.2K]

Answer:

(E) The z-scores of the height measurements

Step-by-step explanation:

Mean is given by

$\bar {x}=\frac{1}{n}\left(\sum _{i=1}^{n}{x_{i}}\right)=\frac{x_{1}+x_{2}+\cdots +x_{n}}{n}$

Where,

n = Number of people

$x_{i}$ = The heights of people

When converting m to cm the mean would be

$\bar {x}=\frac{1}{n}\left(\sum _{i=1}^{n}{x_{i}}\right)\times 100$

So, the mean would change

The median gives us the middle data value when the data values are in ascending order.

So, the median would change

Standard deviation

$s=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\bar{x})^2}$

When converting to centimeters

$s=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}\left((x_i-\bar{x})\times 100\right)^2$

Hence, the standard deviation would change

When converting to centimeters the maximum height in meters would be the maximum height in centimeters also.

The z score is given by

$z=\frac{x-\mu}{\sigma}$

where,

x = Data point

$\mu$ = Mean

$\sigma$ = Standard deviation

When converting to centimeters

$z=\frac{(x-\mu)\times 100}{\sigma\times 100}\\\Rightarrow z=\frac{x-\mu}{\sigma}$

Hence, the z score would remain the same

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3 years ago

you have just win a prize that pays you 1$ for the first day , 2$ on the second day 3$ on the third day and so on for the month

vivado [14]

The answer is $31 dollars because there is 31 days in August

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3 years ago

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What is the product? Enter your answer as a fraction, in simplified form, in the box. −14⋅(−611)

valina [46]

$-\frac{1}{4}(-\frac{6}{11})$ is approximately 0.14!

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✉️ If any further questions, inbox me! ✉️

4 0

3 years ago

Please answer and explanation

mrs_skeptik [129]

61.23 square inches of metal is needed to create a cylindrical can.

Solution:

Diameter of the base = 3 in

Radius of the base = 3 ÷ 2 = 1.5 in

Height of the cylinder = 5 in

The value of π = 3.14

<u>To find the surface area of the cylinder:</u>

Surface area of the cylinder = $2 \pi r^{2}+2 \pi r h$

= 2 × 3.14 × (1.5)² + 2 × 3.14 × 1.5 × 5

= 14.13 + 47.1

Surface area of the cylinder = 61.23 sq. in

Hence 61.23 square inches of metal is needed to create a cylindrical can.

3 0

3 years ago