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The table to the right shows the results of a survey in which 400

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RegionPercentageEast35%South32%Midwest25%West56% rowspan=”5″>The table to the right shows the results of a survey in which 400
adults from the East, 400 adults from the South, 400 adults from the Midwest, and 400 adults from the West were asked if traffic congestion is a serious problem. Construct a 99% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem.

 
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standard deviation

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 The average math SAT score is 525
with a standard deviation of 113
A particular high school claims

that its students have unusually high math SAT scores. A random sample of 45
students from this school was selected, and the mean math SAT score was 569
Is the high school justified in its claim? Explain.

Yes/no Because the z score ____ is unusual/ not unusual since it lies/does not lie withing the range of a usual even, namely within 1 standard deviation/2 standard deviations/3standard deviations of the mean of the sample means.

 
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Use the standard normal distribution or the t-distribution

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 Use the standard normal distribution or the t-distribution to construct a 95% confidence

interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results.
In a random sample of 21 mortgage institutions, the mean interest rate was 3.62% and the standard deviation was 0.44%. Assume the interest rates are normally distributed.

 
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Use the given statement to represent a claim

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Use the given statement to represent a claim

 
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