Question: A human resource manager is trying out a staff development technique that she hopes will increase productivity. The average number of productivity score on one

A human resource manager is trying out a staff development technique that she hopes will increase productivity. The average number of productivity score on one of the staff members is 14.5 with a standard deviation of 8. This year, after trying her new staff development technique, she takes a random sample of staff and finds the average productivity score to be 14.7. She wonders whether or not this is a statistically significant increase.a. State the null and alternative hypothesis. b. Calculate and interpret Cohen's d?c. If the population standard deviation was = 4, would the effect size be different? How would it be different?

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