1. A handler loads one item every 5 minutes, so 480 items are completed in his first week of work. His manager checks his work by randomly selecting a day of the week, then reviewing all the item she completed that day. Does this sampling plan result in a random sample?
Does this sampling plan result in a random sample?
a) No, because all possible groups of n items do not have an equal chance of being selected.
b) Yes, because all possible groups of n items have an equal chance of being selected.
c) Yes, because each item has an equal chance of being selected.
d) No, because each item does not have an equal chance of being selected.
2. Does this sampling plan result in a simple random sample?
a) No, because each item does not have an equal chance of being selected.
b) Yes, because all possible groups of n items have an equal chance of being selected.
c) No, because all possible groups of n items do not have an equal chance of being selected.
d) Yes, because each item has an equal chance of being selected.
3. Listed below are the top 10 annual salaries (in millions of dollars) of TV personalities. Find the (a) mean, (b) median, (c) mode, and (d) midrange for the given sample data in millions of dollars. Given that these are the top 10 salaries, do we know anything about the salaries of TV personalities in general? Are such top 10 lists valuable for gaining insight into the larger population?
37.3 36.3 36 26.2 15.7 12.6 11.7 10.5 9.5 7.6
a) The mean is ______
b) The median is ________
c) A. The mode is _______ (use a comma to separate answers as needed.)
b. there is no mode
d) The midrange is _______
4. Given that these are the top 10 salaries, do we know anything about the salaries of TV personalities in general?
a) Since the sample values give information about one segment of the salaries of TV personalities, they give a lot of information about the salaries of TV personalities in general.
b) Since the mean, median, and midrange are relatively reliable even with small samples, a lot of information is given on the salaries of TV personalities in general.
c) Since the sample values are the 10 highest, they give almost no information about the salaries of TV personalities in general.
d) Since the mean, median, and midrange are based on small sample, no information is given on the salaries of TV personalities in general.
5. Are such top 10 lists valuable for gaining insight into the larger population?
a. No, because such top 10 lists represent an extreme subset of the population rather than the larger population
b. Yes, because such top 10 lists give partial information about the population
c. No because the mean, median, and midrange are based on a small sample
d. Yes, because the mean, median, and midrange are relatively reliable even with small samples.
6. A woman wrote to a newspaper advice columnist and claimed that she gave birth 305 days after a visit from her husband, who was in the Navy. Lengths of pregnancies have a mean of 268 days and a standard deviation of 14.6 days. Find the z score for 305 days. Is such a length unusual?
The z score is _______ (round to two decimal places as needed.)
Is a pregnancy length of 305 days unusual?
a) Yes, because its corresponding z score is greater than 2
b) No, because its corresponding z score is greater than 2
c) No, because its corresponding z score is less than 2
d) Yes, because its corresponding z score is less than 2