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3 years ago

What is the difference between experiments and surveys

1 answer:

muminat3 years ago

5 0

A survey is a practice of asking a particular group of people for their thoughts on a product or issue, an Experiment is the practice of doing a comprehensive study on a n issue with the aim of proving it scientifically.

A survey is based on public opinion whereas an experiment is is putting in work to see the outcome, using trials and different ways of experimentation

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Sebastian grew 21-3 inches each year for the past 3 years. How many inches total has Sebastian grown in the past 3 years?

Rainbow [258]

Answer:

the Answer is 21.3 x 3

Step-by-step explanation:

inches that grew each year for the past 3 years - 21.3

SO here 1 year = 21.3 inches

and it is asked about 3 years so we have to multiply 21.3 inches x 3 times ( 3 years).

8 0

2 years ago

Which of the following points lies on the graph of this equation? y = 2x – 2 Select one: a. (-1, -1) b. (1, 0) c. (1, 4) d. (-1,

Ket [755]

For this case we have the following equation:
y = 2x - 2
For the point (1, 0) we have:
x = 1
y = 0
Substituting values we have:
0 = 2 (1) - 2
0 = 2 - 2
0 = 0
We observe that equality is fulfilled and therefore, the point belongs to the equation.
Answer:
b. (1, 0)

7 0

3 years ago

Complete the equation, by supplying the missing exponent.<br> m•n2•m3= m 11n2

MaRussiya [10]

Given:

Consider the given equation is:

$m^?\cdot n^2\cdot m^3=m^{11}\cdot n^2$

To find:

The missing exponent.

Solution:

Let x be the missing exponent. Then the given equation can be written as

$m^x\cdot n^2\cdot m^3=m^{11}\cdot n^2$

It can be rewritten as:

$(m^x\cdot m^3)\cdot n^2=m^{11}\cdot n^2$

$m^{x+3}\cdot n^2=m^{11}\cdot n^2$ $[\because a^ma^n=a^{m+n}]$

On comparing the coefficient of m, we get

$x+3=11$

$x=11-3$

$x=8$

Therefore, the value of the missing exponent is 8. So, the complete equation is $m^8\cdot n^2\cdot m^3=m^{11}\cdot n^2$ .

4 0

2 years ago

Suppose the lifetime of a cell phone battery is normally distributed with a mean of 36 months and a standard deviation of 2 mont

solong [7]

Answer:

They should guarantee the lifetime of their batteries for 32 months.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean of 36 months and a standard deviation of 2 months.

This means that $\mu = 36, \sigma = 2$