The tyre of a car wheel has an outer diameter of 30 cm . How many times will the wheel rotate on a journey of 5 km

A wood board 156 centimeters long is cut into three parts. The two longer parts are the same length and are 15 centimeters longe

Andrei [34K]

The three parts are a -141

7 0

3 years ago

A paper reported that in a representative sample of 282 American teens age 16 to 17, there were 71 who indicated that they had s

elena-s [515]

Answer:

$z=\frac{0.252 -0.25}{\sqrt{\frac{0.25(1-0.25)}{282}}}=0.0776$

$p_v =P(z>0.0776)=0.4691$

Since the p value is higher than the significance level so then we can conclude that we have enough evidence to FAIL to reject the null hypothesis and there is no evidence in order to say that the true proportion of teens more than a quarter of Americans age 16 to 17 have sent a text message while driving is higher than 0.25

Step-by-step explanation:

Information provided

n=282 represent the sample selected

X=71 represent the teens indicated that they had sent a text message while driving

$\hat p=\frac{71}{282}=0.252$ estimated proportion of teens indicated that they had sent a text message while driving

$p_o=0.25$ is the value that we want to test

$\alpha=0.01$ represent the significance level

z would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to check if more than a quarter of Americans age 16 to 17 have sent a text message while driving, and the hypothesis are:

Null hypothesis: $p\leq 0.7$

Alternative hypothesis: $p > 0.25$

The statistic is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

Replacing we got:

$z=\frac{0.252 -0.25}{\sqrt{\frac{0.25(1-0.25)}{282}}}=0.0776$

Decision

The p value for this case is:

$p_v =P(z>0.0776)=0.4691$

Since the p value is higher than the significance level so then we can conclude that we have enough evidence to FAIL to reject the null hypothesis and there is no evidence in order to say that the true proportion of teens more than a quarter of Americans age 16 to 17 have sent a text message while driving is higher than 0.25

8 0

3 years ago

What’s the answer I don’t understand it or know it.

fredd [130]

Answer:

I tried solving it and didn't get same exact numbers but I got 8.67 million people so it might be answer choice B.

7 0

2 years ago

PLEASE HELP!!!! WILL GIVE BRAINLIEST!!!!

ycow [4]

Secants:

<CBG

<AGF

<ABD

Tangent:

<CDE

Chords:

<BD

<DF

<BG

<BF

<GD

<FG

I haven't figured out the nineteen angles, i would love heIp as well with them.

3 0

4 years ago

Read 2 more answers

Please help me thank you!

iris [78.8K]

A midpoint divides a line segment into two congruent segments. So, if point U is the midpoint of RS, then that means that RU and SU are congruent.

If RU is 12, then SU is also 12.

So, the whole length of SR is 24.

1) Solution: 24

The midpoint and segment congruency statement in the first problem also applies to the second problem.

SV = TV

2x = 11

Divide both sides by 2 to get x by itself.

x = 5.5

2) Solution: 5.5

4 0

3 years ago

Read 2 more answers