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The sum of two consecutive intergers is 139 find the intergers

aniked [119]

Answer:

69 and 70

Step-by-step explanation:

69 + 70 = 139

69 and 70 are consecutive numbers that add up to 139.

8 0

3 years ago

Read 2 more answers

Researchers conducted a study to find out if there is a difference in the use of ereaders by different age groups. randomly sele

ikadub [295]

No, there is significant difference in the use of e readers by different age groups.

Given sample 1 ( 29 years old) $n_{1}$ =628, $p_{1}$ =7%, sample 2( 30 years old) $n_{2}$ =2309, $p_{2}$ =0.11.

We have to first form hypothesis one null hypothesis and other alternate hypothesis.

$H_{0}:$ π1-π2=0

$H_{1}:$ π1-π2≠0

α=0.05

Difference between proportions $p_{1}-p_{2} =-0.04$

$p_{d}=0.07-0.11=-0.04$

The pooled proportion needed to calculate standard error is:

$p=(X_{1} -X_{2} )/(n_{1} +n_{2} )$

=(44+254)/(628+2309)

=0.10146

The estimated standard error of difference between means is computed using the formula:

$S_{p_{1} -p_{2} }=\sqrt{p(1-p)/m_{1}+p(1-p)/n_{2} }$

= $\sqrt{0.101*0.899/628+0.101*0.899/2309}$

= $\sqrt{0.000143+0.00003}$

= $\sqrt{0.000173}$

=0.01315

Z= Pd-(π1-π2)/ $S_{p_{1} -p_{2} }$

=-0.04-0/0.013

=-3.0769

This test is a two tailed test so the p value for this test is calculated as (using z table)

p value:2 P(Z<-3.0769)

=2*0.002092

=0.004189

P value< significance level of 5%.

Hence there is enough evidence to show the claim that there is a significant difference in the use of e readers by different age groups.

Learn more about hypothesis at brainly.com/question/11555274

#SPJ4

Question is incomplete as it also includes:

Significance level of 5%.

4 0

2 years ago

Matthew purchased a desk that was on

natulia [17]

Answer:

ANSWER :

285.12

discount amount =45/00 x 480=45 x 48/10

=216.0

price of discount =480-216=264

salex tex 8/100 x 264. =21.12

total many of spend 264+21.12=285.12

4 0

3 years ago

The rent for an apartment was $6,600 per year in 2012. If the rent increased at a rate of 4% each year thereafter, use an expone

yan [13]

Answer:

$8,029.91

Step-by-step explanation:

You have to use the exponential growth equation:

A=P(1+r)^t

Where A is the final amount, P is the initial amount, r is the rate of increase, and t is the time in years. So:

A=6,600(1+0.04)^5

(The rate has to be changed into a decimal)

Then, just plug this equation into a calculator (without the A= part, so just 6,600(1+0.04)^5) and you'll get the answer.

8 0

4 years ago

Simplify – 2(7x – 3)

ANTONII [103]

All you need to do here is multiply the outside number by both 7x and -3.

When done correctly it should look like this:

-14x+6

Thats the answer.

7 times 2 gives you 14 but when multiplying mixed signs it turns negative so it would be -14.

negative 3 times negative 2 gives you 6. Both signs are negative, and you would suppose it would turn into a negative but thats only true when both signs are mixed. Both the 3 and the 2 are negative, making the signs the samez giving you positive

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5 0

3 years ago