1. In a study, the sample is chosen by choosing every 3rd person on a row What is the sampling method?

• Simple Random
• Systematic
• Stratified
• Cluster
• Convenience

1.0 In a study, the sample is chosen by choosing every 3rd person on a row What is the sampling method?

• Simple Random
• Systematic
• Stratified
• Cluster
• Convenience

1.1 Which of the following are reasons that a sampling technique may not be scientific. Choose all that apply.

• Self-Selected Sample
• The wording of survey question influences the response
• The sample statistic is not exactly equal to the population parameter
• The sample size is too small
• The sample is not representative of the population

1.2 Determine whether the following is an example of a sampling error or a non sampling error.

A psychiatrist surveyed 8000 people to see the proportion who had seen a psychiatrist at least once in their lives. Unfortunately, there was confusion amongst the respondents about the difference between a psychologist and a psychiatrist and the recorded proportion was higher than it should have been due to this confusion.

• Sampling Error
• Non Sampling Error

1.3 Randomly selecting 20 cards out of a 52 card deck, the probability of each outcome will be basically the same whether it is done with or without replacement.

• True
• False

1.4

70 adults with gum disease were asked the number of times per week they used to floss before their diagnoses.

The (incomplete) results are shown below:

# of times floss per week	Frequency	Relative Frequency	Cumulative Frequency
0	6	0.0857	6
1		0.1429	16
2	15		31
3	9	0.1286	40
4	10	0.1429	50
5	9	0.1286	59
6	5	0.0714
7	6	0.0857	70

a. Complete the table (Use 4 decimal places when applicable)

b. What is the cumulative relative frequency for flossing 3 times per week? %

1.5 In a student survey, fifty-two part-time students were asked how many courses they were taking this term.

The (incomplete) results are shown below:

Please round your answer to 4 decimal places for the Relative Frequency if possible.

# of Courses	Frequency	Relative Frequency	Cumulative Frequency
1
2	16	0.3077	32
3	20	0.3846	52

What percent of students take exactly two courses? %