# Sampling Techniques

5476 Words Aug 9th, 2011 22 Pages
Sampling Techniques Worksheet

For each description of sampling, decide if the sampling technique is

A. Simple Random
B. Stratified
C. Cluster
D. Systematic
E. Convenience

1. In order to estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Intel selected every 8th chip that comes off the assembly line starting with the 3rd, until she obtains a sample of 140 chips.

2. In order to determine the average IQ of ninth-grade students, a school psychologist obtains a list of all high schools in the local public school system. She randomly selects five of these schools and administers an IQ test to all ninth-grade students at the selected schools.

3. In an effort to determine customer satisfaction,
the average
b. the standard deviation
c. the first quartile
d. the median
e. the mode
f. the third quartile
g. the 90th percentile
h. the 40th percentile

1. This data is a list of three-year rates of return of 40 small-capitalization growth mutual funds.
27.4 16.7 10.8 24.1 25.9
12.7 28.5 22.2 18.4 17.4
22.6 29.6 11.6 45.9 16.6
32.1 47.7 10.9 18.4 23.3
18.2 32 25.5 23.7 38.1
23.7 14.7 12.8 31.1 21.9
18.4 21.3 27 19.6 15.8
14.7 37 19.2 18.5 29.1

2. This data is a list of the percent of persons living in poverty in each of the 50 US states in 1997.

14.8 9.4 13 10.4 11.2 16.3 23.4 15.2 14.1 12.5
8.5 10.1 13.3 16.4 10.7 10.0 16.6 11.7 15.1 10.5
18.8 9.1 11.6 18.4 9.7 9.6 11.8 11.4 16.7 17.5
18.4 14.3 8.2 10.7 18.6 7.7 12.3 11.9 8.3 8.5
16.8 14.7 9.6 9.3 10.6 9.2 11.8 13.1 10.9 12.7

3. The following table gives the number of children under the age of five in 50 households.
Number of children under five Number of households
0 16
1 18
2 12
3 3
4 1

Chapter 2 – Histogram

The following is a frequency table of the number of customers who enter a Wendy’s restaurant in a 15-minute interval. Complete the Cumulative Frequency column.

Number of customers Frequency Relative Frequency Cumulative Frequency
1 1 0.025 0.025
2 6 0.15
3 1 0.025
4 4 0.1
5 7 0.175
6 11 0.275
7 5 0.125
8 2 0.05
9 2 0.05
10 0 0.0
11 1 0.025

Construct a histogram below. Make sure to label and scale both axis. Chapter 2 – Worksheet

The following is a