Home Chapter 3 Quiz

# Quiz

This activity contains 15 questions.

## A statistician summed the observed numerical values of a variable and then divided the total by the number of observations. What measure of central tendency is being found?

 Mode Standard deviation Median Arithmetic mean

## Give the median for the temperatures recorded over the course of a day during a record high.

 101°F 98°F 102°F 99°F

## If a data set is arranged in numerical order, it is called a(n) __________.

 dot scale summation ordered array range

## A ____________ distribution is one in which the values are predominantly located in the center of the distribution with relatively few values falling in the tails.

 platykurtic mesokurtic leptokurtic left-skewed

## The property which concerns the relative concentration of values in the center of the distribution as compared to the tails is called __________.

 variance dispersion Kurtosis symmetry

## What measure of central tendency is affected by extreme values in a set of data?

 Mode Mean Median None of the choices are correct.

## Distributions with two modes are referred to as __________.

 bimodal unimodal symmetrical skewed

## Calculate the midrange value for the following data set.

 6.5 5 3.5 7

## The first quartile for an ordered data set is the value such that ______ percent of the observations are smaller and ________ percent are larger.

 25; 75 75; 25 50; 50 10; 90

## Determine the value of the third quartile for the following data set.

 25 19 26 16

## The amount of variation or spread of data is called the __________ of the data.

 dispersion deviation skewedness range

## Which of the following statements can never be true for a data set?

 The range is equal to zero. The variance and the standard deviation are equal. The standard deviation is equal to negative one. All of the choices are correct.

## For the following data set, the range is ________ and the sample standard deviation is ______.

 1.20; 0.42 0.80; 0.26 1.00; 0.31 1.20; 0.14

## A distribution in which the upper half is a mirror image of the lower half is defined as __________.

 symmetric asymmetric positively skewed negatively skewed