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Mandarinka [93]
3 years ago
14

Please help me i give brainliest !!!!!!!

Mathematics
1 answer:
balu736 [363]3 years ago
8 0
Omg!!!!!!!!!!!!!!!!!!!!!!!!!!
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Marise blew up 24 balloons. She tied the balloons together in groups of 4. How many groups did she make?
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if you have any questions, leave them in the comments and i will try to answer them, if this helped, pls give brainliest

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Answer:

The 90​% confidence interval for the mean nicotine content of this brand of cigarette is between 20.3 milligrams and 30.3 milligrams.

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 = 9 - 1 = 8

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 8 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.8595

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The upper end of the interval is the sample mean added to M. So it is 25.3 + 5 = 30.3 milligrams.

The 90​% confidence interval for the mean nicotine content of this brand of cigarette is between 20.3 milligrams and 30.3 milligrams.

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