![subject](/tpl/images/cats/mat.png)
Mathematics, 14.03.2020 04:11 mallorynichole19
Batteries produced by a manufacturing company have had a life expectancy of 135 hours. Because of an improved production process, the company believes that there has been an increase in the life expectancy of its batteries. A sample of 42 batteries showed an average life of 140 hours. From past information, the standard deviation of the population is known to be 24 hours. Test to determine whether there has been an increase in the life expectancy of batteries. What is the test statistic, and what conclusion can be made at the .10 level of significance?a. z =.208; Do not reject the null hypothesis b. z =.088; Do not reject the null hypothesis c. z = 1.35; Reject the null hypothesis d. z = 2.33; Reject the null hypothesis
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/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 17:30, leannamat2106
43lbs of tomatos cost $387. how much would 41lbs cost
Answers: 1
![image](/tpl/images/cats/mat.png)
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 23:00, johnsonkia873
Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second
Answers: 1
You know the right answer?
Batteries produced by a manufacturing company have had a life expectancy of 135 hours. Because of an...
Questions in other subjects:
![Konu](/tpl/images/cats/obshestvoznanie.png)
![Konu](/tpl/images/cats/fizika.png)
![Konu](/tpl/images/cats/ekonomika.png)
![Konu](/tpl/images/cats/en.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 21.08.2019 06:50
![Konu](/tpl/images/cats/istoriya.png)
![Konu](/tpl/images/cats/en.png)
English, 21.08.2019 06:50
![Konu](/tpl/images/cats/fizika.png)
Physics, 21.08.2019 06:50
![Konu](/tpl/images/cats/mat.png)
Mathematics, 21.08.2019 06:50
![Konu](/tpl/images/cats/mat.png)
Mathematics, 21.08.2019 06:50