Identify the type of sampling used (simple, cluster, stratified, systematic, convenience)

A. At a local technical school, five auto repair (out of a total of 20) classes are randomly selected and all of the students from each class are interviewed.

B. At a local technical school, the auto repair classes are divided by the time of day and six randomstudents from each of the classes are interviewed.

C. A lobbyist for the oil industry assigns a number to each senator and then uses a computer To randomly generate ten numbers. The lobbyist contacts the senators corresponding to these numbers .

D. Every fifth adult entering an airport is checked for extra security screening.

E. A survey regarding download time on a certain Web site is administered on the internet by amarket research firm to anyone who would like to take it.

Use this sample data of repair costs for cars used in crash tests for slow speed crashes:

(all in are dollars) 400, 1250, 1542, 1843, 1950, 2040, 2104, 2344, 2524, 3000, 2344

Round your answers to one decimal place.

Mean =

Mode =

Med =

Would it make sense to use this info to predict the average repair costs for high speed crashes?

The table is a sample data of repair costs for cars used in crash tests for slow speed crashes:

Round your answers to one decimal place

Cost Frequency Relative Frequency as a % Cumulative Frequency

$0-$499 12

$500-$999 17

$1000-1499 25

$1500-1999 15

$2000-2499 10

$2500-2999 5

$3000-3499 4

$3500-3999 6

Draw a histogram for this data set.

What is the shape of the data set?