Constructing confidence intervals for the proportion


Discuss the below:

We will be constructing confidence intervals for the proportion of each color as well as the mean number of candies per bag.

Construct a 95% Confidence Interval for the proportion of blue M&Ms® candies.

Construct a 95% Confidence Interval for the proportion of orange M&Ms® candies.

Construct a 95% Confidence Interval for the proportion of green M&Ms® candies.

Construct a 95% Confidence Interval for the proportion of yellow M&Ms® candies.

Construct a 95% Confidence Interval for the proportion of red M&Ms® candies.

Construct a 95% Confidence Interval for the proportion of brown M&Ms® candies.

Construct a 95% Confidence Interval for the mean total number of candies (large samples).

Q: How many candies should be sampled to obtain a 95% CI of the proportion of blue candies with a 4% margin of error if the known proportion of blue candies is 0.24?

Blue Orange Green Yellow Red Brown Total
bin


10 10 14 8 7 9 58
51


7 11 14 10 7 5 54
52


9 8 7 13 12 10 59
53


10 14 7 8 9 7 55
54


16 12 9 10 4 5 56
55


17 6 6 11 6 8 54
56


14 11 11 5 8 8 57
57


15 16 11 12 1 2 57
58


9 10 8 15 7 6 55
59


22 16 4 8 3 4 57
60


9 13 17 7 8 5 59




15 19 7 6 3 9 59




10 6 9 10 11 9 55




8 9 8 6 12 13 56




11 12 10 11 5 7 56




15 10 15 10 3 2 55




7 15 16 6 6 9 59




11 14 8 14 8 3 58




8 7 16 7 9 13 60




13 14 5 6 7 12 57




18 6 7 11 8 8 58




14 9 10 8 10 6 57




11 19 10 5 9 7 61




11 12 15 4 7 4 53




11 8 10 5 16 7 57




16 8 9 5 11 10 59




8 4 18 6 10 12 58




14 14 8 8 6 6 56




11 12 10 12 7 3 55




12 9 12 8 5 9 55




4 7 17 4 14 6 52




6 10 12 12 9 8 57




13 12 16 5 6 5 57




16 7 13 8 5 6 55




12 11 8 7 7 12 57




16 9 14 4 4 9 56




23 9 8 7 8 5 60




5 6 27 2 1 2 43




13 13 11 11 6 4 58




5 12 12 7 9 7 52




10 11 17 4 9 6 57




19 10 9 5 4 7 54




14 11 6 8 7 9 55




10 15 7 9 5 10 56




10 7 9 13 8 8 55




14 11 10 13 7 3 58




10 14 12 7 4 5 52




13 10 4 8 14 5 54




14 11 10 13 7 3 58




10 14 12 7 4 5 52




13 10 4 8 14 5 54




9 6 16 7 8 11 57




14 10 11 9 11 5 60




15 10 13 8 8 5 59




13 15 9 7 8 3 55




6 12 10 7 7 10 52




5 8 11 4 15 10 53




12 10 12 6 5 9 54




9 13 14 1 10 12 59




10 7 15 7 9 8 56




7 14 10 2 3 7 43




9 3 10 5 6 6 39




10 6 15 16 11 5 63




12 13 8 16 5 0 54




13 10 5 13 5 10 56




15 6 9 9 11 6 56




7 4 10 7 6 12 46




9 8 6 12 8 9 52




14 6 8 5 10 5 48




801 715 741 558 523 481 3819 <-- Total Number of candies sampled
0.2097 0.1872 0.194 0.1461 0.1369 0.1259   phats, sample proportions for each color

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Basic Statistics: Constructing confidence intervals for the proportion
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