![subject](/tpl/images/cats/mat.png)
Mathematics, 21.12.2019 00:31 BookiesBaby8533
An article in the november 1983 consumer reports compared various types of batteries. the average life-times of duracell alkaline aa batteries and eveready energizer alkalineaa batteries were given as 4.1 hours and 4.5 hours, respectively. suppose these are thepopulation average lifetimes. a.let¯xbe the sample average lifetime of 100 duracell batteries and¯ybe the sampleaverage lifetime of 100 eveready batteries. what is the mean value of¯x-¯y(i. e.,where is the distribution of¯x-¯ycentered)? how does your answer depend on thespecified sample sizes? e(¯x-¯y) =e(¯x)-e(¯y) =μ¯x-μ¯y=μx-μy= 4.1-4.5 =-0.4the mean value of¯x-¯ydoes not depend on the sample size. b.suppose the population standard deviations of lifetime are 1.8 hours for duracellbatteries and 2.0 hours for eveready batteries. with the sample sizes given in part(a), what is the variance of the statistic¯x-¯yand what is the standard deviation? v(¯x-¯y)=v(¯x) +v(¯y) =σ2¯x-σ2¯y=σ2x/√m-σ2y/√n=(1.8)2/100 + 22/100 =0.0724qv(¯x-¯y)=0.2691
![ansver](/tpl/images/cats/User.png)
Answers: 1
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Other questions on the subject: Mathematics
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 17:20, clairajogriggsk
Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?
Answers: 2
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 20:30, psychocatgirl1
Answer asap evaluate 4-0.25g+0.5h4−0.25g+0.5h when g=10g=10 and h=5h=5.
Answers: 3
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 21:30, brandon436
Nine people are going to share a 128-ounces bottle of soda. how many ounces will each person get drink? choose the correct equation and answer for this situation
Answers: 1
You know the right answer?
An article in the november 1983 consumer reports compared various types of batteries. the average li...
Questions in other subjects:
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/istoriya.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/biologiya.png)
![Konu](/tpl/images/cats/geografiya.png)
![Konu](/tpl/images/cats/himiya.png)
Chemistry, 19.02.2021 01:40
![Konu](/tpl/images/cats/informatica.png)
![Konu](/tpl/images/cats/informatica.png)
Computers and Technology, 19.02.2021 01:40