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Statistics: Unit 1 Problem Set 1

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Unit 1 Problem Set 1
Section 1-2 Ex. 26: A. Yes. B. Yes, because 92% of 73 is 67, while 72% of 83 is 59. This shows that even in a smaller total amount of surgeries, there are still a greater amounts of success. C. There is a difference between the two types of help. If it implies that there must be a difference as in an increase in both then it would have to be taken again. D. I would have to say make another study before anything concrete. If this is the only evidence then yes, it should.

Section 1-3 Ex. 30:
The sample is the 9% of the population (91). The population is the 1012. Yes, it is representative since it is just a random poll.

Section 1-4 Ex. 18:
He is asking the students to enter their height rather than a third party to measure them. He is also asking in inches which some students may only know their height in centimeters.

Section 1-5 Ex. 8:
Expirament.

Section 1-5 Ex. 18:
Stratified Sampling.

Section 2-2 Ex. 12: Weight of Discarded Metal and Plastic(lbs) | Frequency of Metal | Frequency of Plastic | 0.00-0.99 | 5 | 14 | 1.00-1.99 | 26 | 20 | 2.00-2.99 | 15 | 21 | 3.00-3.99 | 12 | 4 | 4.00-4.99 | 4 | 2 | 5.00-5.99 | 0 | 1 |

They appear to be different. Where the first metal frequency is outweighed it is then again in the second by a greater amount.
Metal 1 = 4.95 while Plastic1= 13.86 Metal2 =25.74 while Plastic2= 39.8

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