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jeka94
3 years ago
12

I need help

Mathematics
2 answers:
kotykmax [81]3 years ago
5 0

Answer:okay send me a picture of your lesson

Step-by-step explanation:

Ksivusya [100]3 years ago
5 0

Answer:

or

Step-by-step explanation:

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Assume the population has a normal distribution. A sample of 25 randomly selected students Has a mean test score of 81.5 With a
Natasha_Volkova [10]

Answer:

The 90% confidence interval for the mean test score is between 77.29 and 85.71.

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution 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 = 25 - 1 = 24

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 24 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 2.064

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.064\frac{10.2}{\sqrt{25}} = 4.21

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

The lower end of the interval is the sample mean subtracted by M. So it is 81.5 - 4.21 = 77.29

The upper end of the interval is the sample mean added to M. So it is 81.5 + 4.21 = 85.71.

The 90% confidence interval for the mean test score is between 77.29 and 85.71.

6 0
3 years ago
Ellema knows that 1/5 written as a decimal is 0.2. How can Ellema use this information to find the decimal equivalent for 9/5 wi
Rus_ich [418]

Answer:

1.8

Step-by-step explanation:

0.2 times 5 is 1.8

3 0
3 years ago
Read 2 more answers
Ammar hikes 2 3/4 miles of nature trail in 1 hour15 minutes. How many miles of trail does am mar hike per hour
AleksandrR [38]
Change 1 hour 15 minutes = 1.25 hour because 15 ÷ 60 = 0.25 so we add 0.25 hour and change 2 3/4 to 2.75
Equation: \frac{2.75}{1.25}=  \frac{?}{1} 
Multiply 2.75 × 1 = 2.75 ÷ 1.25 = 2.2 miles
I'm pretty sure this is correct
4 0
3 years ago
If the diameter is 4 feet and<br> 18 inches, how long is the radius?
wel

Answer:

2 feet 9 inches

Step-by-step explanation:

Radius = Diameter/2

3 0
3 years ago
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IS 0.32 x 102 WRITTEN IN SCIENTIFIC NOTATION? JUSTIFY YOUR ANSWER.
IceJOKER [234]
3.264 x 10^1 hope this helps :)
3 0
3 years ago
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