Question

1. If you want to study the effect of hormonal changes in adolescent boys, your population would be

Group of answer choices

All adolescents

All the people in the world

All males

All adolescent males

2. Which of the following is most likely to be measured categorically?

Group of answer choices

Weight gain in first year college students

Deterioration in driving performance under the influence of alcohol

Level of authoritarianism in a sample of public accountants

Species of dog appearing in the Sunday comics

3. To produce good estimates of population parameters we need to have a _______ sample.

Group of answer choices

Random

Normal

Independent

Systematic

4. The branch of statistics dealing with making comparisons between two different conditions in which subjects were tested is called

Group of answer choices

Inferential statistics

Correlational statistics

Descriptive statistics

Test statistics

5. One of the most important skills that students learn in statistics courses is

Group of answer choices

The ability to memorize complex mathematical formulae

the ability to logically interpret data

Nothing important is learned in statistics courses

The ability to perform multiple regressions on a calculator

6. Which of the following is false?

Group of answer choices

We usually collect data from an entire population

A sample refers to the observations drawn from a population

The average score on an example for a class is a descriptive statistic

Categorical data is also known as frequency data

7.Without a random sample, we cannot

Group of answer choices

Collect quantitative data

Accurately estimate the parameters of a population

Calculate statistics

Consult a decision tree to decide on an appropriate statistical procedure

8. Scales of measurement are important because

Group of answer choices

They reflect the kinds of statements we may make about relationships between points on the scale

They limit the kinds of conclusions we can draw from a study

They influence the kinds of statistical tests we will use in at least a crude way

All options present

9. When we are concerned about the measurement scale, we are concerned about

Group of answer choices

Both the underlying concept and our interpretation of them

The underlying concept which we are trying to measure

The interpretation we can give to our resulting statistics

The numbers we have collected

10. If we are comparing the adrenaline scores of children who live near an airport with those who live away from an airport, the dependent variable is

Group of answer choices

Distance from the airport

Stress

Adrenaline

Location

11. In the preceding question the independent variable is

Group of answer choices

Adrenaline

Stress

The number of children treated for sleep disturbance

Location

12. If we want to obtain a random sample of people to interview, we could best do so by

Group of answer choices

Drawing random numbers from a table and linking a number to a person

Knocking on doors and interview whoever answers

Asking for volunteers

Taking every 10th name out of the telephone book

13. The Greek letter ∑ is a symbol for

Group of answer choices

Suppression

The square root

Multiplication

Summation

Answer #1

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As per forum rules we are allowed to answer 1 question per post, hence answering the first question. You may post other questions separately.

1.

The study group is all boy adolescents ( hence male adolescents only are part of the study in the question, not the entire universe).

Hence, the population under study will be : All adolescents males.

Other groups, such as All Males, or All the people in the world , or All adolsecents ARE NOT the scope of the study.

**Answer: All adolescent Males**

You run some sample data and are comparing your sample mean to a
published population mean. Can you use a
z-test in order to test for significance?
Group of answer choices
A. No, you would never use the z-test for this situation.
B. No, you must always use a t-test with population means.
C. Yes, no matter what statistics you have available.
D. Yes, but only if you have the population standard
deviation.

Encircle the letter that corresponds to your answer:
1. When one analyses data based on a sample, one
calculates a
Parameter b) variable c)
constant d) statistics 2. Mathematical methods used to draw
tentative conclusions about a population based on sample Data are
referred to as
Descriptive statistics b) sample
statistics c) inferential statistics d)
random sampling 3. The mean is ____ sensitive to extreme scores
than the median.
More b)
equally c) less 4. If a distribution
of raw...

A Statistics major student, wants to estimate the true
proportion of the Minnesotans (between ages 22 and 35) using Metro
Transit. He surveys randomly selected 200 Minnesotans between the
ages of 22 and 35 and finds that 62% of them use Metro Transit.
A. What is the population and what is the measurement we are
interested in?
B. What proportion is the 62% mentioned in the problem?
(sample/population?)
C.Construct the 95% confidence interval to estimate the true
proportion of Minnesotans...

1. Do you want to own your own candy store? With some interest
in running your own business and a decent credit rating, you can
probably get a bank loan on startup costs for franchises such as
Candy Express, The Fudge Company, Karmel Corn, and Rocky Mountain
Chocolate Factory. Startup costs (in thousands of dollars) from a
random sample of candy stores in the Chicago area are given
below:
95 173 129 95 75 94 116 100 85
a) Find...

The goal of statistics is to use data to understand something
about the world. To obtain useful results, a scientific approach
should be followed. The basic approach can be summarized into a few
steps.
Write a question that can be answered by collecting data.
Determine what variables to measure and how to collect a data
sample.
Analyze the data and create appropriate summaries.
Create a report of the results, drawing conclusions or
inferences where appropriate.
For example, suppose you are...

1. Does listening to music increase the average amount of time
you study? Twenty people participate in an experiment to test the
effects of music on studying. Half of the participants listen to no
music first and then classical music. The other half listen to
classical music first and then no music. The amount of time they
study is recorded (in minutes) each time.
A 95% confidence interval of (-36.84, 60.56) is found. What
conclusion can we make?
(No music...

1-A runs plot is a graphical technique for displaying data
collected over different time periods.
Select one:
a. False
b. True
2 - ________________ is the science of using a sample to make
generalizations about the important aspects of a population.
Select one:
a. Statistical Process Control
b. Random Sample
c. Statistical Inference
d. Descriptive Statistics
3- The two types of quantitative variables are:
Select one:
a. interval and ordinal.
b. ordinal and ratio.
c. nominative and ordinal.
4- Time...

1.
For this problem you will need a t-table. What is the t-value
needed for a confidence interval with a sample size = 25 and alpha
=.05?
Group of answer choices
2.064
2.060
1.708
1.706
2.
Small Sample Mean Problem. The maker of potato chips uses an
automated packaging machine to pack its 20-ounce bag of chips. At
the end of every shift 18 bags are selected at random and tested to
see if the equipment needs to be readjusted....

Use this information to answer the following 6
questions:
A study is being conducted to compare the average training time
for two groups of airport security personnel: those who work for
the federal government and those employed by private security
companies. From a random sample of 12 government-employed security
personnel, average training time was 72 hours, with a sample
standard deviation of 8 hours. In a random sample of 16 privately
employed security personnel, training time was 65.4 hours, with...

Question 1 (1 point)
You own a small storefront retail business and are interested in
determining the average amount of money a typical customer spends
per visit to your store. You take a random sample over the course
of a month for 8 customers and find that the average dollar amount
spent per transaction per customer is $106.745 with a standard
deviation of $13.7164. Create a 95% confidence interval for the
true average spent for all customers per transaction.
Question...

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