Q1 E9 Statistics

What is the value of the mode when all values in the

data set are different?

• 0

• 1

• There is no mode

• It cannot be determined unless the data values are given

When data are categorized as, for example, places of

residence (rural, suburban, urban), the most appropriate

measure of central tendency is the

• mean

• median

• mode

• midrange

P₅₀ corresponds to

• Q₂

• D₅

• IQR

• Midrange

Which is not part of the five-number summary?

• Q1 and Q3

• The mean

• The median

• The smallest and the largest data values

A statistic that tells the number of standard deviations a data value is above or below the mean is called

• a quartile

• a percentile

• a coefficient of variation

• a z-score

When a distribution is bell-shaped, approximately what

percentage of data values will fall within 1 standard

deviation of the mean?

• 50%

• 68%

• 95%

• 99.7%

A measure obtained from sample data is called

a

The positive square root of the variance is called

the

The symbol for the population standard deviation is

When the sum of the lowest data value and the highest

data value is divided by 2, the measure is called the