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nika2105 [10]
3 years ago
13

Select all that apply

Mathematics
2 answers:
zlopas [31]3 years ago
7 0
The answer is a BDEFG
Artist 52 [7]3 years ago
3 0
The answer is going to be BDEFG
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in a random sample of 28 people, the mean commute time to work was 31.2 minutes and the standard deviation was 7.3 minutes. assu
antoniya [11.8K]

Answer:

The margin of error of u is of 3.8.

The 99% confidence interval for the population mean u is between 27.4 minutes and 35 minutes.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 28 - 1 = 27

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 27 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.99}{2} = 0.995. So we have T = 2.7707

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.7707\frac{7.3}{\sqrt{28}} = 3.8

In which s is the standard deviation of the sample and n is the size of the sample.

The margin of error of u is of 3.8.

The lower end of the interval is the sample mean subtracted by M. So it is 31.2 - 3.8 = 27.4 minutes

The upper end of the interval is the sample mean added to M. So it is 31.2 + 3.8 = 35 minutes

The 99% confidence interval for the population mean u is between 27.4 minutes and 35 minutes.

3 0
3 years ago
<1 is a complement of <2, and m<1=66. find <2
Furkat [3]

Answer:

114

Step-by-step explanation:

that's supplementary

6 0
3 years ago
80 cm to 42.5 cm for percent change
Fofino [41]

Answer:

= 46.875% decrease

Step-by-step explanation:

Mark as brainliest :)

5 0
3 years ago
Idk, please help.<br>10 points:)​
m_a_m_a [10]
I haven’t done this in a while
7 0
3 years ago
A student has a container with a volume of 2.5 liters.
Alja [10]

Answer:

10%

Step-by-step explanation:

2.5-2.4=0.1

0.1=10%

3 0
2 years ago
Read 2 more answers
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