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math201 gdb4

math201 gdb4 - 2 False When one wants to have a higher...

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23rd Sept. 2011 Module 6, GDB 4 RE: Explain what is wrong and why it is wrong: 1. The higher the confidence level, the narrower the confidence interval. 2. A good way to increase a confidence interval is to increase the sample size. 3. The day before a big election, a pre-election survey showed that Candidate A got 52%, and Candidate B got 48%. The margin of error is 3%. If nothing changes, Candidate A will win. 4. If a probability distribution curve is bell-shaped, then this is a normal distribution. 5. A normal distribution curve may be symmetric, left-skewed, or right-skewed. 6. Because the tails of the normal distribution curve are infinitely long, the total area under the curve is also infinite. 1) False. When the confidence level is higher, then the wider the confidence interval will be.
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Unformatted text preview: 2) False. When one wants to have a higher confidence interval, he or she will need to decrease the sample size. When one wants to have a small confidence interval, he or she will need to increase the sample size. 3) False. The chances of winning for both of the candidates are too close because the margins overlap with each other. It is not based by the distance between them, but rather both of the values. 4) True. A normal distribution is in a bell shaped curve. 5) False. A normal distribution curve is bell shaped and symmetrical, therefore, it cannot be skewed either to the right or left. It would not be symmetrical if it was skewed left or right. 6) False. A normal distribution curve that has an infinite series will have a finite sum. It will not have an infinite sum....
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