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Nata [24]
3 years ago
9

It is claimed that 95% of teenagers who have a cell phone never leave home without it. To investigate this claim, a random sampl

e of 300 teenagers who have a cell phone was selected. It was discovered that 273 of the teenagers in the sample never leave home without their cell phone. One question of interest is whether the data provide convincing evidence that the true proportion of teenagers who never leave home without a cell phone is less than 95%. What are the values of the test statistic and P-value for this test?
Mathematics
1 answer:
lbvjy [14]3 years ago
6 0

Answer:

B. z = –3.18, P-value = 0.0007

Step-by-step explanation:

edge 2021

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During the first four months of the year, Jack earned $1270, $1150, $870 and $1450 If Jack must have an average salary of at lea
tia_tia [17]

Answer:

1010

Step-by-step explanation:

There are a whole class of questions that rely on the method to this one.

First add up what you know

1270 + 1150 + 870 + 1450 = 4740

Now add on the 5th month (which you don't know. Call it x)

4740 + x

Divide by 5

(4740 + x)/5 = 1150 and that is your equation    

Solution

Multiply both sides by 5

5*(4740 + x) / 5 = 1150 * 5

4740 + x = 5750

Subtract 4740 from both sides

4740 - 4740 + x = 5750 - 4740

x = 1010

Which seems kind of low, but that's what the numbers come to.

6 0
3 years ago
A stereo that cost $500 and sold for $750 in profit percentage​
Mashutka [201]

Answer:

50% profit

Step-by-step explanation:

750-500 is 250 so that is a 50% profit/markup

7 0
3 years ago
Paco needs at least 3/8 yard of twine to build a model ship.how much twine could he buy
Stells [14]
<em>Paco could buy 1/2 a yard, 5/8 yard, 3/4 yard, 7/8 yard, 1 yard, 1 1/8, so fourth since these fractions are all greater than 1. </em>
4 0
3 years ago
Help pleaseeee i don’t know
marissa [1.9K]

Answer:

C, at least that's what I think.

6 0
3 years ago
What is the value of m in the figure below? If necessary,round your answer to the nearest tenth of a unit
bogdanovich [222]

Answer:

D

Step-by-step explanation:

It turns out from similar triangles, that 7/BD = BD / 18. Use triangles  ABD and BDC to show this relationship. Solving this equation will give you BD

BD^2 = 7*18

BD^2 = 126     Just leave it in this form. Do your rounding at the end.

Because triangle BDC is a right angle triangle, use the Pythagorean Theorem to solve for m

m^2 =  BD^2 + 7^2

m^2 = 126 + 49

m^2 = 175                         Take the square root of both sides.

sqrt(m^2) = sqrt(175)

m = 13.22

so the answer is D

3 0
3 years ago
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