Question

Name: Ch. 2 WH 50 1. (3 points) For each of the following statistical summaries, explain whether it is a population parameter or a sample statistic. (a) The average score on the first midterm exam is 798% for n-32 students in a statistics dass. The of the five classes at the university using this one instructor is intersted in describing the performance class. (b) The average score on the first midterm exam is 798% for n-32 students in a statistis class. The instructor is only interested in describing the performance of this particular class. 2. (5 points) In 1998 a headline in USA Today read, "Prayer can lower blood pressure." The story studied the Bbleael atoeligious TV orr tathat (a) ( point) What was the sample size for this observational study? "attending religious services lowers blood pressure more than turning into religious TV or radio. on an observational study which followed 2391 people aged 65 or over for 6 years. They and prayed or studied the Bible once a day found that people who attend a religious service once a week were 40% less likely to have high blood pressure than those who didn't go to church every week and prayed and studied the Bable less. (b) (I point) Describe the observational units in this study. e) 2 points) Identify the explanatory and response variables in this study. (d) (i point) Can you conclude that prayer actually causes lower blood pressure? Why or why not? 3. (4 points) Give examples of the following types of variables: (a) an ordinal categorical variable (b) a categorical variable that is not ordinal. (c) a continuous quantitative variable. (d) a quantitative variable that is not continuous Ch. 2

Answer 1

(1)

Population Parameters - When numbers are summarize for the entire population.

Sample Statistics - When numbers are summarize from a sample only

(a) In this case we can see that average score is 79.8% for class of n=32 which means information is given for the sample not the entire population of the university.

Thus this is the sample statistic.

(b) In this case also the average score is  79.8% for class of n=32 which means information is given for the sample not the entire population of the university.

Thus is is also the sample statistic.

Note that we decide the sample statistic or parameter based on the given data not what we are going to calculate.

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