Ask question

Ask question

All categories

2 years ago

9

_________ blank means that, everything else being equal, each time one takes the drug one increases slightly the probability tha

t he or she will take it again.

1 answer:

lys-0071 [83]2 years ago

5 0

Answer:

Reinforcement

You might be interested in

Can anybody help with this one ...... ?

VLD [36.1K]

Answer:The answer is choice 3

Step-by-step explanation:

8 0

3 years ago

A study of recent records of car accidents revealed that average proportion of drivers who were distracted by their phones at th

aksik [14]

Answer:

At least 547 records need to be studied.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence interval $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

Z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

And the margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence interval

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $z = 1.96$ .

In this problem, we have that:

$M = 0.04, p = 0.35$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.04 = 1.96\sqrt{\frac{0.35*0.65}{n}}$

$0.04\sqrt{n} = 0.93486$

$\sqrt{n} = 23.37$

$n = 546.2275$

At least 547 records need to be studied.

6 0

3 years ago

Just do number 12 please

FinnZ [79.3K]

Please make it clear:)

8 0

3 years ago

The heights of apricot trees in an orchard are approximated by a normal distribution model with a mean of 18 feet and a standard

Ulleksa [173]

Answer:

0.9544

Step-by-step explanation:

We are given that mean=18 and standard deviation=1 and we have to find P(16<X<20).

P(16<X<20)=P(z1<Z<z2)

z1=(x1-mean)/standard deviation

z1=(16-18)/1=-2

z2=(x2-mean)/standard deviation

z2=(20-18)/1=2

P(16<X<20)=P(z1<Z<z2)=P(-2<Z<2)

P(16<X<20)=P(-2<Z<0)+P(0<Z<2)

P(16<X<20)=0.4772+0.4772=0.9544

The probability that the height of a tree is between 16 and 20 feet is 95.44%

5 0

3 years ago

The point (3,0) lies on a circle with the center at the origin. What is the area of the circle to the nearest hundredth?

juin [17]

we know that

the equation of a circle with the center at the origin is equal to

$x^{2} +y^{2} =r^{2}$

step 1

with the point (3,0) find the value of the radius

substitute the values of

$x=3\\ y=0$

in the equation of the circle above

so

$3^{2} +0^{2} =r^{2}$

$3^{2} =r^{2}$

$r =3$

step 2

with the radius find the area of the circle

area of the circle is equal to

$A=\pi *r^{2}$

for $r=3$

$A=\pi *3^{2}$

$A=28.27$ units²

therefore

the answer is

the area of the circle to the nearest hundredth is $A=28.27$ units²

4 0

3 years ago

Read 2 more answers