exam 1 ex

# exam 1 ex - Lab Section 30_5 Exam 1 Explanations Name...

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Lab#__________ Name___________________ Section 30__5____ Partner: _______________ Exam 1 Explanations 1. We know that the distribution of our dataset is bell-shaped, the mean, x = 14 and the standard deviation, s = 6. Which of the following statements would be true about our data? A.) The median, x % , would also be 14. B.) The IQR would also be 6. C.) None of the observations would be negative. D.) All of the above are true. E.) Only two of the above are true. 2. Which of the following graphs would have told us our data was normal (bell-shaped)? A.) A normal quantile plot in which the points fell along a bell curve. B.) A boxplot with the sections equally spaced to represent the 1, 2 and 3 standard deviations. C.) A stemplot with the middle row being the longest and the other rows progressively shorter as they got further from the middle. D.) A histogram with a peak, not flat. E.) All of the above would indicate the data is approximately normally distributed. 3. In an experiment, an observed effect so large that it would rarely occur by chance is called A.) an outlier. B.) influential. C.) statistically significant. D.) a bias on the data. E.) Exactly two of the above are correct. 4. Numbering from 1 to 5, left to right, which of the boxplots above most likely has the smallest standard deviation? A.) 1 B.) 2 C.) 3 D.) 4 E.) 5 5. Still refering to the boxplots, which has a mean about 40? A.) You can't tell the mean from a boxplot, only the median. B.) 1 C.) 2 D.) 3 E.) 5 6. A simple random sample of size n is defined to be A.) a sample of size n chosen in such a way that every value in the population has the same (equal) chance of being chosen. B.) a sample of size n chosen in such a way that every unit (observations) in the population has the same (equal) chance of being chosen. C.) a sample of size n chosen in such a way that every value in the population has a known probability (chance) of being chosen. D.)

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## This note was uploaded on 03/26/2008 for the course STAT 303 taught by Professor Carroll during the Spring '08 term at Texas A&M.

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exam 1 ex - Lab Section 30_5 Exam 1 Explanations Name...

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