TEKS.MATH.9-12.IV.D.2

What is the Normal Range of the monthly salary of teachers if the average is $4,000.00 with a standard deviation of 3,000?

• 1000-7000
• 3000-4000
• 1000-4000
• 4000-7000

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TEKS.MATH.9-12.IV.D.2

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have less than 5 accidents?

• 0.6915
• 0.1762
• 0.8238
• -0.93

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TEKS.MATH.9-12.IV.D.2

In a recent poll of 803 randomly selected baseball fans in Connecticut, 44% said their favorite team was the Yankees. If researchers wanted to reduce the margin of error to at most 2%, how many baseball fans do they have to randomly select? 

• 1564
• 2367
• 803
• 3170

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TEKS.MATH.9-12.IV.D.2

If 827 represents "no" voters out of 2584, construct a 95% confidence interval for the "no" group.

• [.300,.340]
• [.298,.342]
• [.302,.338]
• [.288,.352]

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TEKS.MATH.9-12.IV.D.2

Snobby University accepts only those graduate students who score in the top 5% of the GRE (Graduate Requirements Exam).

Given that µ = 151.3 and σ = 8.7, what is the lowest score you can get and still be accepted to SU? Round to the nearest whole number.

• 165

• 166

• 170

• 162

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TEKS.MATH.9-12.IV.D.2

Let X be a random variable that has a skewed distribution with mean µ = 10 and standard deviation σ = 10. Based on random samples of size 400, the sampling distribution of X is

• highly skewed with mean 10 and standard deviation 10

• highly skewed with mean 10 and standard deviation 5

• highly skewed with mean 10 and standard deviation 0.5

• approximately normal with mean 10 and standard deviation 10

• approximately normal with mean 10 and standard deviation 0.5

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TEKS.MATH.9-12.IV.D.2

How do we reduce variability?

• Increase randomness.

• Increase sample size.

• Decrease randomness.

• Decrease sample size.

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TEKS.MATH.9-12.IV.D.2

Why is a sample of 1000 people better than a sample of 100 people?

• It reduces the margin of error.

• It decreases bias.

• Having more people is always better.

• More people means that our results are more accurate.

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TEKS.MATH.9-12.IV.D.2

Single stocks and mutual funds carry the same amount of risk.

• True

• False

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TEKS.MATH.9-12.IV.D.2

Expected value is

• an average.

• a predicted value of a game.

• the sum of the values multiplied by their probabilities.

• all of the above.

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TEKS.MATH.9-12.IV.D.2