1. If a data set has an even number of observations, the first quartile (25th pe

Question

1. If a data set has an even number of observations, the first quartile (25th percentile)

Must be equal to the mode

2. Which of the following is not a measure of dispersion?

interquartile range

3. A blood bank in Ybor city noticed that the percentages of each blood type from donors seemed to differ from the state averages. Wanting to be sure that they kept adequate supplies for the blood types in their community, they decided to conduct a survey. They randomly selected 200 people from a list of all Ybor city residents who had previously indicated that they would be willing to donate blood. A nurse was sent to each to recorded the blood type of each potential donor. The information was combined to estimate the percentages of each blood type for Ybor city.
What type of sampling plan is this?

systematic random sampling

4. In a data set from a sample, the average of all data values for a particular characteristic is known as the

sample mean

5.

Two studies are run to determine the effect of low levels of wine consumption on cholesterol level. In the first study, researchers collect information on cholesterol levels and wine drinking habits of 100 undergraduate students through a survey conducted on the USF campus. The second study measures the cholesterol levels of 100 volunteers who have not consumed alcohol in the past year, randomly picks half the group to drink one glass of wine daily for a year while the others drink no alcohol for the year, and finally measures their levels again.
Which of the following is a true statement?

Explanation / Answer

1. Let us take an example to explain this

values be 1,2,3,4,5,6

The first quartile (or lower quartile or 25th percentile) is the median of the bottom half of the numbers. So, to find the first quartile, we need to place the numbers in value order and find the bottom half.

1   2   3   4   5   6   

So, the bottom half is

1   2   3   

The median of these numbers is 2.

Now median for this is

The median is the middle number in a sorted list of numbers. So, to find the median, we need to place the numbers in value order and find the middle number.

Ordering the data from least to greatest, we get:

1   2   3   4   5   6   

As you can see, we do not have just one middle number but we have a pair of middle numbers, so the median is the average of these two numbers:

Median=3+4/2=3.5

Hence answer is B. Is the middle of the dave values that are less than median.

b. First quartlie is the measure of central tendency, hence it is not a measure of dispersion. Answer is B

c. This is example of simple random sample rest as 200 samples are randomly selected and nurse went to each one of them and collected the data.

4. As this data is for sample and it is data value for a particular characteristic, and sample we know the characterists that is computed is knows as statistic.

Hence answer is C.

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