A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg.
...
![subject](/tpl/images/cats/mat.png)
Mathematics, 06.05.2020 06:57 natalie2sheffield
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg.
a) Find a 95% confidence interval for the mean mass of this type of concrete block.
b) Find a 99% confidence interval for the mean mass of this type of concrete block.
c) An engineer claims that the mean mass is between 38.2 and 38.4 kg. With what level of confidence can this statement be made?
d) How many blocks must be sampled so that a 95% confidence interval will specify the mean mass to within ±0.1 kg?
e) How many blocks must be sampled so that a 99% confidence interval will specify the mean mass to within ±0.1 kg?
![ansver](/tpl/images/cats/User.png)
Answers: 1
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 14:30
Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 15:00
Find the balance at the end of 4 years if 1000 is deposited at the rate of
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 16:00
Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2
Answers: 1
![question](/tpl/images/cats/mat.png)
You know the right answer?
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 09.12.2021 17:30
![question](/tpl/images/cats/fr.png)
French, 09.12.2021 17:30
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 09.12.2021 17:30
![question](/tpl/images/cats/biologiya.png)
Biology, 09.12.2021 17:30
![question](/tpl/images/cats/mat.png)
Mathematics, 09.12.2021 17:30
![question](/tpl/images/cats/istoriya.png)
History, 09.12.2021 17:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 09.12.2021 17:30
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 09.12.2021 17:30
![question](/tpl/images/cats/biologiya.png)
Biology, 09.12.2021 17:40
![question](/tpl/images/cats/himiya.png)
Chemistry, 09.12.2021 17:40
![question](/tpl/images/cats/mat.png)
Mathematics, 09.12.2021 17:40
![question](/tpl/images/cats/mat.png)
Mathematics, 09.12.2021 17:40
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 09.12.2021 17:40
![question](/tpl/images/cats/mat.png)
Mathematics, 09.12.2021 17:40
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 09.12.2021 17:40