A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sample of 651 adults, asked those adults about their party affiliation ( Democrat, Republican or none) and their opinion on how the US economy was changing ("getting better", "getting worse ", or "about the same"). The result are shown in the table below. Better Same. Worse Republicans 38 104 44 Democrat 12 87 137 None 21 90 118 1.What fraction of those affiliated with neither party thought the economy was about the same? ( answer as a decimal and round to the nearest 0.001) 2. Among survey respondents who thought the economy was about the same, what fraction were affiliated with neither party? (answer as a decimal and round to the nearest 0.001) 3. What fraction of survey respondents were affiliated with neither party who thought the economy was about the same? (answer as a decimal and round to the nearest 0.001)
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sample of 651 adults, asked those adults about their party affiliation ( Democrat, Republican or none) and their opinion on how the US economy was changing ("getting better", "getting worse ", or "about the same"). The result are shown in the table below.
Better Same. Worse
Republicans 38 104 44
Democrat 12 87 137
None 21 90 118
1.What fraction of those affiliated with neither party thought the economy was about the same? ( answer as a decimal and round to the nearest 0.001)
2. Among survey respondents who thought the economy was about the same, what fraction were affiliated with neither party? (answer as a decimal and round to the nearest 0.001)
3. What fraction of survey respondents were affiliated with neither party who thought the economy was about the same? (answer as a decimal and round to the nearest 0.001)
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