Data were collected on the annual mortality rate (deaths per 100,000) for males in 61 large towns in England and Wales. The data set also notes for each town whether it was south or north of Derby. The summary statistics are given below. Is there a significant difference in mortality rates i Group North South the two regions? Answer parts a and b. Assume a significance level of a = 0.05. StdDev Count Mean Median 41 1628.04 1628 1507 131.54 156.09 20 1512.19 A Click the icon to view the boxplot of the data. a) Test the null hypothesis at a = 0.05 using the two-sample t-test. dentify the null and alternative hypotheses. Choose the correct answer below. O A. Ho: HN - Hs =0 HA: HN -Hs #0 O B. Ho: HN - Hs = 0 HA: HN - Hs >0 O C. Ho: HN - Hs =0 HA: HN - Hs <0 O D. Ho: HN - Hs #0 HA: PN - Hs = 0

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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.