Question 1

Determine whether the given description corresponds to an observational study or an experiment. A doctor gives a new medication to half of his patients with the flu and a placebo
To the other half of his patients with the flu.

Accepted Answer

A)   Observational study
B)   Experiment B

Question 2

Determine whether the given description corresponds to an experiment or an observational study. A stock analyst selects a stock from a group of twenty for investment by choosing the
Stock with the greatest earnings per share reported for the last quarter.

Accepted Answer

A)   Experiment
B)   Observational study B

Question 3

There are many potential pitfalls that can cause problems when analyzing data. Which of  these choices are not classified as a potential pitfall?

Accepted Answer

A)   Order of survey questions
B)   Nonresponse
C)   Self-reported data
D)   Measured data D

Question 4

Identify the type of observational study used. A town obtains current employment data by  polling 10,000 of its citizens this month.

Accepted Answer

A)   Prospective
B)   Retrospective
C)   Cross-sectional
D)   None of these

Question 5

A management survey for a company surveyed 235 employees. 44.7% of the employees surveyed were females. The number of males would be ___________________.

Accepted Answer

A)   130
B)   105
C)   13
D)   Unable to determine

Question 6

On a test, 74% of the questions are answered correctly. If 111 questions are correct, how many questions are on the test?

Accepted Answer

A)   37 questions
B)   67 questions
C)   150 questions
D)   82 questions

Question 7

Subscribers of the women's magazine Cosmopolitan are asked to participate in a survey about
preferred cereals for breakfast. Are the results likely to be representative of all women? Of all
subscribers of Cosmopolitan? Why or why not?

Accepted Answer

The answer of Subscribers of the women's magazine Cosmopolitan are...

Question 8

Why do you think that cluster sampling is frequently used in practice?

Accepted Answer

The answer of Why do you think that cluster sampling...

Question 9

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)  Ordinal 
C)  Nominal 
D)  Interval

Question 10

Which of the following does not apply to the ratio level of measurement?

Accepted Answer

A)   Can be arranged in order
B)   Differences between data values can be found and are meaningful
C)   Cannot be arranged in order
D)   There is a natural zero starting point

Question 11

Given the data in the table, what issue can be addressed by conducting a statistical analysis of
the values? $$\begin{array}{l}
\text { Amounts of Saturated Fat (in grams) in Two-Once Regular and Low-Fat Muffins }\
\begin{array} { l | l l l l l l } 
\text { Regular } & 4.5 & 3.5 & 3.7 & 5.2 & 4.9 & 3.9 \
\hline \text { Low-Fat } & 1.2 & 2.1 & 2.2 & 1.8 & 1.6 & 2.2
\end{array}
\end{array}$$

Accepted Answer

The answer of Given the data in the table, what...

Question 12

Determine which level of measurement is appropriate. Salaries of college professors?

Accepted Answer

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

Question 13

A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product. Identify the type of study used.

Accepted Answer

A)   Experiment
B)   Observational study

Question 14

Why is cluster sampling frequently used in practice?

Accepted Answer

The answer of Why is cluster sampling frequently used in...

Question 15

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

The answer of Would an observational study or an experiment...

Question 16

Form a conclusion about statistical significance. Do not make any formal calculations. Either
use the results provided or make subjective judgments about the results.
Last year, the average math SAT score for students at one school was 475. The headmaster
introduced new teaching methods hoping to improve scores. This year, the mean math SAT
score for a sample of students was 481. Is there statistically significant evidence that the new
teaching method is effective? If the teaching method had no effect, there would be roughly a 3
in 10 chance of seeing such an increase. Does the result have statistical significance? Why or
why not? Does the result have practical significance?

Accepted Answer

The answer of Form a conclusion about statistical significance. Do...

Question 17

Identify which type of sampling is used. The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag.

Accepted Answer

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

Question 18

Determine whether the given value is a statistic or a parameter. Thirty percent of all dog owners poop scoop after their dog.

Accepted Answer

A)   Statistic
B)   Parameter

Question 19

Which of the following is an inappropriate way to deal with missing data?

Accepted Answer

A)   Delete cases with missing data
B)   Substitute missing values
C)   Determine if missing values are random
D)   Ignore missing data

Question 20

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

Accepted Answer

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

Exam 1: Introduction to Statistics

Determine whether the given description corresponds to an observational study or an experiment. A doctor gives a new medication to half of his patients with the flu and a placebo To the other half of his patients with the flu.

Determine whether the given description corresponds to an experiment or an observational study. A stock analyst selects a stock from a group of twenty for investment by choosing the Stock with the greatest earnings per share reported for the last quarter.

There are many potential pitfalls that can cause problems when analyzing data. Which of these choices are not classified as a potential pitfall?

Identify the type of observational study used. A town obtains current employment data by polling 10,000 of its citizens this month.