IDENTIFY TRUE OR FALSE #1-9

1. Given the following data: 12, 42, 53, 14, 59, and 28. The range is 47.
2. If the standard deviation of a study population is 11, the population variance is 121.
3. A sample variance will be zero if each of the data values in the random sample has the same value.
4. The measure of dispersion is a numerical value that describes how widely the data are disperse about a central value.
5. In any data set, the mode will always be unique.
6. A single, extremely large value can affect the median more than the mean.
7. Mean and median are affected when a constant is added to each data values in a data set.
8. The mean is the most frequently observed value of the measurements of a study variable of interest.
9. The mean is not meaningful if extremely large or small values are found in the data set.
10. The value of the middle term in a ranked data set is called a.) mode b.) median c.) range d.) mean

11.) Which of the following can have more than one value?

a.) mode b.) median c.) range d.) mean

12.) Which of the following is obtained by taking the difference between the maximum and minimum values of a data set?

a.) mode b.) median c.) range d.) mean

13.) What is the sample variance of the following data: 2, 4, 6, 8, 10 and 12?

a.) 11.76 b.) 14.14 c.) 11.70 d.) 14.00

14.) What is the mode value when all values in the data set are different?

a.) all the values b.) there is no mode c.)1 d.)0 15.) When the data are categorized as, for example, socio economic status (Low, Middle, Upper), the most appropriate measure of central tendency is?

a.) mode b.) median c.) range d.) mean

16.) The values of the standard deviation and variance are

a.) always positive b.) can never be zero c.) always negative d.) 0

17.) Which of the following divides a data set into four equal parts?

a.) percentiles b.) median c.) quarantiles d.) mean 18.) A statistic that denotes the number of standard deviations a data value is below or above the mean is called

a.) a variance b.) a z-score c.) a percentile d.) a quartile

19.) The mean of the standard normal distribution is

a.) 100 b.) 1 c.) -1 d.) 0

20.) Suppose a marathon player covers 7 kilometers with a speed of 30 kilometer per hour in a race for his one-way trip. During the return trip, his speed decelerates to 25 km per hour. Find the average time of the marathon player for his two-way trips in a race.

a.) 0.23 hour b.)0.25 hour c.) 0.26 hour d.) 0.28 hour