Question 1

The similarity between an ordinal level of measurement and an interval level of measurement is that ________.

Accepted Answer

A)   differences between data values cannot be determined or are meaningless
B)   both can be arranged in some order
C)   neither can be arranged in some order
D)   differences between data values can be determined and are meaningful

Question 2

A gardener has 75 clients, 45% of whom are businesses. Find the number of business clients.

Accepted Answer

A)   41 clients
B)   36 clients
C)   73 clients
D)   34 clients

Question 3

Identify the type of observational study (cross-sectional, retrospective, prospective).
-In a clinical trial for a new headache medication, participants are randomly assigned to a treatment group or a
placebo group. They do not know whether they are receiving the medication or a placebo. However the doctors
administering the medication and evaluating the results do know which participants are receiving the
medication. This experiment is blind but not double blind. Explain what this means and why the absence of
double blinding could cause a problem.

Accepted Answer

This experiment is blind because partici...

Question 4

A manufacturer of laptop computers claims that only 1% of their computers are defective. In a sample of 600
computers, it was found that 3% were defective. If the proportion of defectives were really only 1%, there would
be less than 1 chance in 1000 of getting such a large proportion of defective laptops in the sample. Is there
statistically significant evidence against the manufacturer's claim? Why or why not?

Accepted Answer

Yes. If the claimed proportion of defect...

Question 5

Would an observational study or an experiment be more appropriate to investigate the effects on humans of a
substance known to be toxic? Explain.

Accepted Answer

No; The exam result of 53.7% i...

Question 6

Identify the type of observational study (cross-sectional, retrospective, prospective).
-Explain what is meant by the term "confounding" and give an example of an experiment in which confounding
is likely to be a problem.

Accepted Answer

Confounding occurs in an experiment when...

Question 7

Determine which of the four levels of measurement is most appropriate. Students' grades of A, B, or C, on a test.

Accepted Answer

A)   Ratio
B)   Nominal
C)   Interval
D)   Ordinal

Question 8

A clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients' illness.

Accepted Answer

A)   Observational study
B)   Experiment

Question 9

A marijuana survey included 1610 responses from a list of approximately 241,500,000 adults in the United States from which every 150,000th name was surveyed. Identify which of these types of sampling is used:

Accepted Answer

A)   Convenience
B)   Stratified
C)   Systematic
D)   Simple random
E)   Cluster

Question 10

Determine whether the given value is a discrete or continuous variable. People are asked to state how many times in the last month they visited their family doctor.

Accepted Answer

A)   Discrete
B)   Continuous

Question 11

A psychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. She randomly selects 100 students from the 260 business majors and 100
Students from the 180 political science majors. Does this sampling plan result in a random sample? Simple
Random sample? Explain.

Accepted Answer

A)   No; yes. The sample is not random because political science majors have a greater chance of being selected than business majors. It is a simple random sample because all samples of size 200 have the same chanceOf being selected.
B)   Yes; no. The sample is random because all students have the same chance of being selected. It is not a simple random sample because some samples are not possible, such as a sample consisting of 50 businessMajors and 150 political science majors.
C)   Yes; yes. The sample is random because all students have the same chance of being selected. It is a simple random sample because all samples of size 200 have the same chance of being selected.
D)   No; no. The sample is not random because political science majors have a greater chance of being selected than business majors. It is not a simple random sample because some samples are not possible, such as aSample consisting of 50 business majors and 150 political science majors.

Question 12

Provide an appropriate response.
-A psychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. She randomly selects 100 students from the 260 business majors and 100
Students from the 180 political science majors. Does this sampling plan result in a random sample? Simple
Random sample? Explain.

Accepted Answer

A)   No; no. The sample is not random because political science majors have a greater chance of being selected than business majors. It is not a simple random sample because some samples are not possible, such as aSample consisting of 50 business majors and 150 political science majors.
B)   Yes; yes. The sample is random because all students have the same chance of being selected. It is a simple random sample because all samples of size 200 have the same chance of being selected.
C)   No; yes. The sample is not random because political science majors have a greater chance of being selected than business majors. It is a simple random sample because all samples of size 200 have the same chanceOf being selected.
D)   Yes; no. The sample is random because all students have the same chance of being selected. It is not a simple random sample because some samples are not possible, such as a sample consisting of 50 businessMajors and 150 political science majors.

Question 13

The good design of experiments includes blinding, ________, and ________.

Accepted Answer

A)   replication; randomization
B)   replication; experimentation
C)   internalization; randomization
D)   replication; voluntary response samples

Question 14

A sample of 120 employees of a company is selected, and the average age is found to be 37 years.

Accepted Answer

A)   Statistic
B)   Parameter

Question 15

Identify which of these types of sampling is used: random, stratified, systematic, cluster, convenience.
-A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

Accepted Answer

A)   Convenience
B)   Cluster
C)   Stratified
D)   Random
E)   Systematic

Exam 1: Introduction to Statistics

Correct Answer
verified
Yes. If the claimed proportion of defect...
View Answer

Determine which of the four levels of measurement is most appropriate. Students' grades of A, B, or C, on a test.

Correct Answer
verified

Correct Answer
verified

The good design of experiments includes blinding, , and .

Correct Answer
verified

Identify which of these types of sampling is used: random, stratified, systematic, cluster, convenience. -A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
This experiment is blind because partici...
View Answer

Would an observational study or an experiment be more appropriate to investigate the effects on humans of a substance known to be toxic? Explain.

Correct Answer
verified
No; The exam result of 53.7% i...
View Answer

A gardener has 75 clients, 45% of whom are businesses. Find the number of business clients.

Correct Answer
verified

A clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients' illness.

Correct Answer
verified

Determine whether the given value is a discrete or continuous variable. People are asked to state how many times in the last month they visited their family doctor.

Correct Answer
verified

The similarity between an ordinal level of measurement and an interval level of measurement is that ________.

Correct Answer
verified

A sample of 120 employees of a company is selected, and the average age is found to be 37 years.

Correct Answer
verified

Identify the type of observational study (cross-sectional, retrospective, prospective). -Explain what is meant by the term "confounding" and give an example of an experiment in which confounding is likely to be a problem.

Correct Answer
verified
Confounding occurs in an experiment when...
View Answer

A marijuana survey included 1610 responses from a list of approximately 241,500,000 adults in the United States from which every 150,000th name was surveyed. Identify which of these types of sampling is used:

Correct Answer
verified

Exam 1: Introduction to Statistics

Correct AnswerverifiedYes. If the claimed proportion of defect...View AnswerShow Answer

Determine which of the four levels of measurement is most appropriate. Students' grades of A, B, or C, on a test.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The good design of experiments includes blinding, ________, and ________.

Correct AnswerverifiedShow Answer

Identify which of these types of sampling is used: random, stratified, systematic, cluster, convenience. -A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThis experiment is blind because partici...View AnswerShow Answer

Would an observational study or an experiment be more appropriate to investigate the effects on humans of a substance known to be toxic? Explain.

Correct AnswerverifiedNo; The exam result of 53.7% i...View AnswerShow Answer

A gardener has 75 clients, 45% of whom are businesses. Find the number of business clients.

Correct AnswerverifiedShow Answer

A clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients' illness.

Correct AnswerverifiedShow Answer

Determine whether the given value is a discrete or continuous variable. People are asked to state how many times in the last month they visited their family doctor.

Correct AnswerverifiedShow Answer

The similarity between an ordinal level of measurement and an interval level of measurement is that ________.

Correct AnswerverifiedShow Answer

A sample of 120 employees of a company is selected, and the average age is found to be 37 years.

Correct AnswerverifiedShow Answer

Identify the type of observational study (cross-sectional, retrospective, prospective). -Explain what is meant by the term "confounding" and give an example of an experiment in which confounding is likely to be a problem.

Correct AnswerverifiedConfounding occurs in an experiment when...View AnswerShow Answer

A marijuana survey included 1610 responses from a list of approximately 241,500,000 adults in the United States from which every 150,000th name was surveyed. Identify which of these types of sampling is used:

Correct AnswerverifiedShow Answer

Correct Answer
verified
Yes. If the claimed proportion of defect...
View Answer

Correct Answer
verified

Correct Answer
verified

The good design of experiments includes blinding, , and .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
This experiment is blind because partici...
View Answer

Correct Answer
verified
No; The exam result of 53.7% i...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Confounding occurs in an experiment when...
View Answer

Correct Answer
verified