Mathematics
I can't understand this assignment!! Statistic

Question Description

Probability Reasoning statistic homework I attached the file below. If anyone is willing to work on it for me that would me very helpful.

I can't understand this assignment!! Statistic
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7. Interpretation of confidence interval:
We are 95% confident that the true population parameter โ€˜percentage of seniors minus percentage of
freshman getting their first choice of coursesโ€™ is between 29.5% and 38.5%.

8.
From given data,
๐‘ฬ‚ = 0.25
๐‘€๐‘Ž๐‘Ÿ๐‘”๐‘–๐‘› ๐‘œ๐‘“ ๐ธ๐‘Ÿ๐‘Ÿ๐‘œ๐‘Ÿ(๐ธ) = 0.03
For 95% confidence interval, ๐›ผ = 0.05
For ๐›ผ = 0.05, ๐‘ง๐›ผ = 1.96
2

๐‘ง๐›ผ
Sample size (๐‘›) = ๐‘ฬ‚ (1 โˆ’ ๐‘ฬ‚ ) (

2

1.96 2
) = 800.33
) = 0.25 โˆ— 0.75 โˆ— (
๐ธ
0.03
2

Round up ๐‘› to nearest integer, ๐‘› = 801
So, 801 students need to be surveyed from 95% confidence interval to be in 3% points.

9/10/11.
If proportion of woman and man abstaining from drinking alcohol are respectively ๐‘1 and ๐‘2 :
Null Hypothesis ๐‘ฏ๐ŸŽ : ๐‘1 โ‰ค ๐‘2
Alternative Hypothesis ๐‘ฏ๐’‚: ๐‘1 > ๐‘2
What test did you run: z-test
To calculate p-value:

๐‘
ฬ‚1 =

264
= 0.2316
1140

๐‘
ฬ‚2 =

214
= 0.1783
1200

We will use ๐‘1 โˆ’ ๐‘2 = 0 (๐‘Ž๐‘  ๐‘๐‘’๐‘Ÿ ๐‘Ž๐‘ ๐‘ ๐‘š๐‘’๐‘‘ ๐‘–๐‘› ๐‘›๐‘ข๐‘™๐‘™ โ„Ž๐‘ฆ๐‘๐‘œ๐‘กโ„Ž๐‘’๐‘ ๐‘–...

apradeep92 (2002)
UIUC

Anonymous
Thanks for the help.

Anonymous
Outstanding. Studypool always delivers quality work.

Anonymous
Tutor was very helpful and took the time to explain concepts to me. Very responsive, managed to get replies within the hour.

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