Confidence interval of the true mean of unhealthy days
The average number of unhealthy days based on Air Quality Index, AQI, in a random sample of 10 metropolitan areas was 33.5 and sample standard deviation was 27.7 days. Find the 98% confidence interval of the true mean of unhealthy days
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Create the scatter plot of data. Then determine the quadratic function which best fits the data. Round-off the coefficients to 2 decimal places, if essential.
An intellectual society, HIGHQ, claims that it grants membership only to people whose IQ is at least 2.5 standard deviations above average. What is the best upper bound that can be attained by Chebyshev's Inequality for the proportion of people el
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What is the best upper bound that can be attained by Chebyshev's Inequality for the proportion of people eligible for membership?
From the normal table, the percentages for classes are 2.28%, 13.59%, 34.13%, 34.13%, 13.59%, and 2.28%, respectively. Do observed frequency data provide significant reason to discredit the hypothesis that the weights are normally distributed with
A sample of 25 blue-collar employees at the production plant was taken. Each employee was asked to determine his own job satisfaction (x) on a scale from 1 to 10.
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