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3 years ago

This is an example of a random sample: Surveying people in the library about whether they like to read books.

Mathematics

2 answers:

allsm [11]3 years ago

7 0

Answer: the answer is false

Step-by-step explanation: if you survey someone about whether they like books or not, you wouldnt really do it in a library! if youre in the library you like to read books, so it wouldnt really be a random sample!

(please can you give me brainliest!!!)

Colt1911 [192]3 years ago

3 0

Answer:

True

Step-by-step explanation:

The sample space would be 2 possible outcomes, 1/2, 50% because it's a yes or no question

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I need help on this problem please

Marysya12 [62]

Answer:

rectangle

Step-by-step explanation:

it would be a rectangle i believ. you can prove it by creating a coordinate plane and placing the points and then connecting the dots

5 0

4 years ago

Find the value of x that make it true

lesantik [10]

Answer:

Step-by-step explanation:

1). 10 = $\frac{1+7x}{7+x}$

10(7 + x) = 1 + 7x

70 + 10x = 7x + 1

10x - 7x = 1 - 70

3x = -69

x = -23

2). 0.2 = $\frac{6+2x}{12+x}$

0.2(12 + x) = 6 + 2x

2.4 + 0.2x = 6 + 2x

2.4 - 6 = 2x - 0.2x

1.8x = -3.6

x = -2

3). 0.8 = $\frac{x}{x+0.5}$

0.8(x + 0.5) = x

0.8x + 0.4 = x

x - 0.8x = 0.4

0.2x = 0.4

x = 2

4). 3.5 = $\frac{4+2x}{0.5-x}$

3.5(0.5 - x) = 4 + 2x

1.75 - 3.5x = 4 + 2x

-3.5x - 2x = 4 - 1.75

-5.5x = 2.25

x = - $\frac{2.25}{5.5}$

x = - $\frac{9}{22}$

6 0

3 years ago

Solve this problem in your notebook using all four steps. Harvey is 3 times as old as Jane. The sum of their ages is 48 years. F

kaheart [24]

By saying jane is 1/3 of harvey then J=1/3 H
by removing J and adding the new quantity we git u will got the answer

3 0

3 years ago

Read 2 more answers

For the second quarter of 2015, Apple sold 61.0 million iPhones. This represented a year- over-year increase of 40%. What were t

Anastaziya [24]

Answer:

It sold 43.57 iPhones for the same quarter in the previous year.

Step-by-step explanation:

It sold 61.0 million iPhone, which is an increase of 40% over the value of the previous year x.

This can be interpreted as:

61 million is 140% = 1.4 of the previous year amount, that is, x. So

$1.4x = 61$

$x = \frac{61}{1.4}$

$x = 43.57$

It sold 43.57 iPhones for the same quarter in the previous year.

4 0

3 years ago

Last year, 45% of business owners gave a holiday gift to their employees. A survey of business owners conducted this year indica

natka813 [3]

Answer:

a)x₁ = 24 business owners plan to provide a gift this year

b) p-value = 0,0017

c)p-value < α we have to eject H₀ And support the claim that the proportion of business owners providing gifts has decrease

Step-by-step explanation:

a) Sample size 80

proportion p₁ = 30 % p₁ = 0,3

Then x₁ = 80*0,3

x₁ = 24 business owners plan to provide a gift this year

b) Hypothesis Test

Null Hypothesis H₀ p₁ = 0,45

Alternative Hypothesis Hₐ p₁ < 0,45

p₁ = 0,3 then q₁ = 1 - 0,3 q₁ = 0,7

z(s) = ( p₁ - 0,45 )/ √p₁* q₁ / n

z(s) = - 0,15 / √0,002625

z(s) = - 0,15 / 0,05123

z(s) = - 2,9279

b)From z-table we find p-value = 0,0017

c) If α = 0,05 ( significance level ) as

p-value < α we have to eject H₀ And support the claim that the proportion of business owners providing gifts has decrease

6 0

3 years ago