there enough evidence to show that there is a difference in mean commute times for male and female working residents of this town? (Use ?males − ?females. Round your test statistic to one decimal place, your df down to the nearest whole number, and your P-value to three decimal places.) Males Females Sample size x s Sample size x s 237 30.6 24.0 273 28.3 24.3 t = df = P-value =
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.
there enough evidence to show that there is a difference in
| Males | Females | ||||
size |
x | s | Sample size |
x | s |
| 237 | 30.6 | 24.0 | 273 | 28.3 | 24.3 |
| t | = |
| df | = |
| P-value | = |
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