Determine whether the study is an observational study or an experiment.A pollster obtains a sample of students and asks them how they will vote on an upcoming referendum.

Provide an appropriate response.Find the z-score for the value 79, when the mean is 55 and the standard deviation is 5.

Determine whether the study is an observational study or an experiment.A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 89 people to a treatment group and 89 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients’ symptoms are evaluated.

Identify the data set’s level of measurement.marriage status (married, single, or divorced) of the faculty at the University of Colorado

The distribution of incomes tend to be skewed- most have average incomes, and a few have very high incomes. What measure of center would be the best choice for this kind of data? 

Provide an appropriate response.The scores of the top ten finishers in a recent golf tournament are listed below. Find the mean score.

Provide an appropriate response.For the stem-and-leaf plot below, what is the maximum and what is the minimum entry?Key : 8 = 11.8

Use the given frequency distribution to find the(a) class width.(b) class midpoints of the first class.(c) class boundaries of the first class.Phone Calls (per day)

Identify whether the statement describes inferential statistics or descriptive statistics.Based on previous clients, a marriage counselor concludes that the majority of marriages that begin with cohabitation before marriage will result in divorce.

Determine whether the data set is a population or a sample.The age of every fourth person entering a department store