1)Situations

• -abcde number every name on a list and use a random number generator to select the first 50 numbers
• -abcde asking people on the street
• -abcde choosing every 5th person on a list
• -abcde selecting a classroom number at random then surveying all the students in that room
• -abcde divide the population by age and select 5 people from each age

Sampling Method

1. Convenience
2. Systematic
3. Simple Random
4. Cluster
5. Stratified

2)The boxplot below shows salaries for Construction workers and Teachers. 2025303540455055Salary (thousands of $)TeacherConstruction[Graphs generated by this script: setBorder(15); initPicture(20,55,-3,11);axes(5,100,1,null,null,1,'off');text([33.5,-3],"Salary (thousands of $)");line([24,2],[24,4]); rect([30,2],[40,4]); line([35,2],[35,4]);line([48,2],[48,4]); line([24,3],[30,3]); line([40,3],[48,3]);line([30,7],[30,9]); rect([35,7],[44,9]); line([40,7],[40,9]);line([51,7],[51,9]); line([30,8],[35,8]); line([44,8],[51,8]);text([20,5],"Teacher","right");text([20,10],"Construction","right");] Jennie makes the minimum salary for a construction worker. Markos makes the median salary for a teacher. Who makes more money?

• Markos
• Jennie

How much more? $

3)

Stem (hundred thousands)	Leaf (ten thousands)
0	667778999
1	02447778889999
2	0011234445667889
3	00011225

The stem-and-leaf plot above shows house sale prices over the last week in Tacoma. What was the most expensive house sold? Give your answer in dollars $

4) Which measure of center is sensitive to extreme values?

• mean
• median
• mode
• midrange

Which measure of center is resistant to extreme values?

• mean
• median
• mode
• midrange

Which measure of dispersion is sensitive to extreme values?

• IQR
• Standard Deviation

Which measure of dispersion is resistant to extreme values?

• IQR
• Standard Deviation

6) In 2010, the Pew Research Center questioned 1210 adults in the U.S. to estimate the proportion of the population favoring marijuana use for medical purposes. It was found that 80% are in favor of using marijuana for medical purposes. State the individual, variable, population, sample, parameter and statistic.

• -abcdef Statistic
• -abcdef Variable
• -abcdef Population
• -abcdef Sample
• -abcdef Parameter
• -abcdef Individual

1. All adults in the U.S.
2. The 80% in favor of using marijuana in the U.S.
3. one adult in the U.S.
4. The 1210 adults in the U.S. surveyed
5. The 80% in favor of using marijuana in the study.
6. Favoring marijuana use for medical purposes

7)The table below shows a stem-and-leaf diagram for the test scores of students in a math class.

Stems	Leaves
6	4
7	4 5 7 8 8
8	0 2 2 3 4 4
9	0 0 0

How many students took the test? What is the lowest score on the test? What is the highest score on the test? The median score on the test is:

8) For the data shown, answer the questions. Round to 2 decimal places.

x

22.8

8.7

6.8

15.8

26.6

Find the mean: Find the median: Find the sample standard deviation:

9) Match each of the following to the type of sampling technique used:

• -abcde The campus list all of the students and then collects data on the number of credits taken by every 5th student on the list.
• -abcde Someone on campus collects data on the number of credits students are taking by asking 30 students as they are leaving the cafeteria.
• -abcde The campus randomly select 20 classes and then collects data on the number of credits taken by students in just those classes.
• -abcde The campus lists all of the students. They then collect data on the number of credits taken by randomly selected students.
• -abcde The campus divides the students based on degree type, and then collects data on the number of credits of randomly selected students from each degree type.

1. stratified sample
2. simple random sample
3. systematic sample
4. cluster sample
5. convenience sample

10) In a study, the data you collect are Gender. What is the level of measurement?

• nominal
• ordinal
• interval
• ratio

11)Here is a sample data set.

126.7	142.0	164.4	200.7	212.2	266.7
279.6	296.4	307.8	361.1	371.6	378.7
383.6	383.6	383.6	388.4	397.5	403.9
404.9	406.2	407.8	414.8	415.3	416.8
418.4	421.4	432.1	432.1	440.5	443.4
455.2	457.5	463.5	463.6	463.8	464.6
480.5	494.6	518.5	526.3	526.3	526.3
549.2	570.9	575.0	590.5	625.6	637.5
667.6	675.2	675.9	686.9	697.0	726.1

Find the minimum for this data set. min = Find the first quartile for this data set. Q₁ = Find the median for this data set. Mdn = Find the third quartile for this data set. Q₃ = Find the maximum for this data set. max =

12)The following data represents the age of 30 lottery winners.

21	26	27	33	33	35
35	36	42	43	43	46
47	47	49	52	53	54
55	57	60	60	61	68
69	70	72	73	73	81

Find the range of the data:

13) During one shift, the express lane clerk recorded how many times customers violated the "10 items or less" rule for his lane. In particular, he recorded how many items over the limit each violator placed on the conveyor belt. This data is summarized in the histogram below. NOTE: The last class actually represents "7 or more items," not just 7 items. What is the frequency of times the limit was exceeded by at least 6 items? ans =

n a study, the sample is chosen by selecting a room of the house, and appraising all items in that room What is the sampling method?

• Simple Random
• Systematic
• Stratified
• Cluster
• Convenience

14)