The 2010 General Social Survey asked the question, "After an average work day, about how many hours do you have to relax or pursue activities that you enjoy?" to a random sample of 1,155 Americans. The average relaxing time was found to be 1.65 hours. Determine which of the following is an observation, a variable, a sample statistic, or a population parameter.

a. Observation= An American in the sample.

b. Variable= Number of hours relaxing after a work day.

c. Sample statistic= 1.65

d. Population parameter= Average number of hours all Americans spend relaxing after the days work.

Step-by-step explanation:

-Observation is the value of something that interests the researcher.

- Variable is the characteristic of the unit being observed by the researcher which is number of hours relaxing after the day's work.

- Sample statistic is the value of the estimate of the descriptive statistic in a sample which is the mean of relaxing hours (1.65).

- Population parameter is the numeric value for a given population and in this, it is the Average numeric hours all Americans spend relaxing at work.

step-by-step explanation:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

step-by-step explanation:

given that megan owns a clothing boutique.

the profits of 2010, 11, are recorded and shown as follows:

years since     2010 0     1     2     3       4       5

profits made in 1000's   39       84     111     120   111     84

we find that profit gradually increases form 2010 to 2013 upto 120,   then starts decreasing.

the profits for 2012 and 2014 are the same while that of 2011 and 2015 are also the same.

this shows that there is symmetry about the line profit = 120000

hence answer is:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

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