1.Match the appropriate measurement scale to the random variable.

Random Variables:

1.IQ (Intelligence Quotient as measured on standard tests)

2.Ice cream flavors available

3.Pain level on a scale of 1 to 10, 10 being the worst

4.Speed in mph (miles per hour)

Measurement Scales:

a)Nominal

b)Interval

c)Ordinal

d)Ratio

2. Which measures of central tendency (mean, median and mode) may apply to each random variable?

3. True or False

a)The range of interval level data is always greater than or equal to the standard deviation.

b)There is only one mean, one median and one mode of a normal distribution and they coincide.

c) For a normal distribution, the area under the probability distribution function within +1 standard deviation from the mean is 68.27%.

d)If the mean of a distribution is greater than the median it is right skewed.

e)To determine if lack of exercise reduces flexibility in the knee joint, a physical therapist asked for volunteers to join their trials.She then randomly selected volunteers to be either in the group that exercises or the group that does not exercise.This is a randomized experiment.

f)The experiment in e) is neither a blind experiment nor a double blind experiment.

g)The prices of generic items are compared to the prices of the equivalent named brand items.These two samples are not matched pairs.

h)A survey in which nurses were asked to record their eating habits over a period of time and in which their general health was recorded is an example of a prospective survey.

i)If a correlation is found in a research study showing that people who are obese have a vitamin D deficiency it is incorrect to conclude that obesity causes a deficiency in vitamin D.

j)A binomial experiment is one in which each trial has two possible outcomes, there is a fixed number of independent trials and the probability of success is the same for every trial.

3. To determine the percentage of defective items in a batch at a major producing company, the quality control department may use any of the five following sampling techniques.Match each technique with the sampling term from the list below that most closely defines that technique.Each sampling term corresponds to one and only one technique.

Techniques:

a.All batches in a given month are stored. The number of defective items is counted in randomly selected batches.

b.The first 10 batches are taken and the number of defective items counted.

c.The batches made in a month are grouped into which shift they are made.The number of defective items is counted in randomly selected batches in each shift.

d.A random number n is determined and every nth batch off the line is taken and the number of defective items in each chosen batch is counted.

e.The batches made in a month are grouped into which day they were made.Then certain days are picked and every batch made that day is counted to determine the number of defective items.

Sampling Terms:

a)Systematic sampling

b)Simple random sampling

c)Stratified sampling

d)Cluster sampling

e)Convenience sampling