practice chapter 8&9

part 2

null hypothesis: mean is 6200

Q2.1: sample mean is 6200

Q2.2 p-value is 0

Q2.3 we reject the null hypothesis because the p-value (0) is less than the significance value (0.05).

part 3

null hypothesis: mean is 0.12

Q3.1 mean of Attrition_Numeric is 0.051

Q3.2 calculated 1-tail p-value is 0

Q3.3 reject the null hypothesis because p-value is less than the significance level (0.05). the only reason HR needs to be concerned from a statistical standpoint is if being below the industry baseline is problematic.

part 4

null hypothesis: no interdependence between the two categorical variables

Q4.1: research and development

Q4.2: software is blocking these values, the AI cant figure out where they are either

Q4.3: Cannot answer this because p-value does not exist, if it is less than 0.05 then we reject it.