C1 Study

a variable

A Lake Tahoe Community College instructor is interested in the average number of days Lake Tahoe Community College math students are absent from class during a quarter. Consider the following. X = number of days a Lake Tahoe Community College math student is absent In this case, X is an example of which of the following?

stratified sampling

A Lake Tahoe Community College instructor is interested in the average number of days Lake Tahoe Community College math students are absent from class during a quarter. The instructor takes her sample by gathering data on 5 randomly selected students from each Lake Tahoe Community College math class. Which type of sampling did she use?

as the population it is representing

A sample should have the same characteristics ________________________________

bias

A sample that does not represent a population is ______

47% of the people surveyed have lived in the United States for 5 years or less.

"47 percent of the people surveyed have lived in the U.S. for 5 years." Fix the statement to make it correct.

4.: Good job, Bad job, No opinion

4. A politician is interested in the proportion of voters in his district that think he is doing a good job. Examples of data _______________________

4. variable

4. A politician is interested in the proportion of voters in his district that think he is doing a good job. The __________ is the opinion of the registered voters.

4. population

4. A politician is interested in the proportion of voters in his district that think he is doing a good job. The ___________ is all voters in the district.

4. sample

4. A politician is interested in the proportion of voters in his district that think he is doing a good job. The ____________ is a group of voters in the district.

4.statistic

4. A politician is interested in the proportion of voters in his district that think he is doing a good job. The ____________ is the proportion of a group of voters in the district who think the politician is doing a good job.

4. parameter

4. A politician is interested in the proportion of voters in his district that think he is doing a good job. The ____________ is the proportion of all voters in the district who think the politician is doing a good job.

Why did you enroll in a distance learning class? Check all that apply.

726 distance learning students at Long Beach City College in the 2004-2005 academic year were surveyed and asked the reasons they took a distance learning class. How do you think the question was worded to get responses that totaled over 100%?

Why did you enroll in a distance learning class? Check only one answer.

726 distance learning students at Long Beach City College in the 2004-2005 academic year were surveyed and asked the reasons they took a distance learning class. How might the question be worded to get responses that totaled 100%?

qualitative measurement

nominal level of measurement is a ____________

name, label or category

nominal level of measurement is defined by ____________

levels of measurements

the ______________________ are nominal , ordinal, interval and ratio level of measurement

4

there are _________levels of measurements

texting while driving

you are concerned about the effects of texting on driving performance. Design a study to test the response time of drivers while texting and while driving only. how many seconds does it take for a drive to respond when a leading car hits the brakes? Describe the explanatory variable.

1. 3 years old, 4 years old, 8 years old

1.Ski resorts are interested in the average age that children take their first ski and snowboard lessons. They need this information to optimally plan their ski classes. Examples:_____________________________

1.variable

1.Ski resorts are interested in the average age that children take their first ski and snowboard lessons. They need this information to optimally plan their ski classes. The ____________ is the age of each child when he or she takes his or her first skiing or snowboarding lesson.

1.statistic

1.Ski resorts are interested in the average age that children take their first ski and snowboard lessons. They need this information to optimally plan their ski classes. The ____________ is the average age of a group of children taking their first skiing or snowboarding lesson

1.parameter

1.Ski resorts are interested in the average age that children take their first ski and snowboard lessons. They need this information to optimally plan their ski classes. The ____________ is the average age of all children when they take their first skiing or snowboarding lesson.

1.sample

1.Ski resorts are interested in the average age that children take their first ski and snowboard lessons. They need this information to optimally plan their ski classes. The _____________ is a group of the children taking skiing or snowboarding lessons.

1.population

1.Ski resorts are interested in the average age that children take their first ski and snowboard lessons. They need this information to optimally plan their ski classes. The ______________ is all of the children taking skiing or snowboarding lessons.

2. 2 weeks, 3 weeks

2. A cardiologist is interested in the average recovery period for her patients who have had heart attacks. Examples of data: __________________

2.statistic

2. A cardiologist is interested in the average recovery period for her patients who have had heart attacks. The ________ is the average recovery period for a group of the cardiologist's patients who have had a heart attack.

2. variable

2. A cardiologist is interested in the average recovery period for her patients who have had heart attacks. The __________ is the time it takes to recover from a heart attack.

2.population

2. A cardiologist is interested in the average recovery period for her patients who have had heart attacks. The ___________ is all of the cardiologist's patients who have had a heart attack.

2.parameter

2. A cardiologist is interested in the average recovery period for her patients who have had heart attacks. The ______________ is the average recovery period for all of the cardiologist's patients who have had a heart attack.

3. population

3. A cardiologist is interested in the average recovery period for her patients who have had heart attacks.

a statistic

A Lake Tahoe Community College instructor is interested in the average number of days Lake Tahoe Community College math students are absent from class during a quarter. The instructor's sample produces an average number of days absent of 3.5 days. This value is an example of which of the following?

all Lake Tahoe Community College math students

A Lake Tahoe Community College instructor is interested in the average number of days Lake Tahoe Community College math students are absent from class during a quarter. What is the population she is interested in?

statistic

A _____________ is a number that is a property of the sample. For example, if we consider one math class to be a sample of the population of all math classes, then the average number of points earned by students in that one math class at the end of the term is an example of a __________

parameter

A _________________ is a number that is a property of the population. Since we considered all math classes to be the population, then the average number of points earned per student over all the math classes is an example of a ________________.

dot plot

A ____________________ consists of a number line and dots (or points) positioned above the number line.

list of all individuals in population with certain characteristics of each individuals.

A census is ______________

5 hours, 3 hours 30 minutes, 2 hours 45 minutes

A fitness center is interested in the average amount of time a client exercises in the center each week. Examples would be ___________________

statistic

A fitness center is interested in the average amount of time a client exercises in the center each week. The ____________ is the average amount of time that a sample of clients exercises in one week.

variable

A fitness center is interested in the average amount of time a client exercises in the center each week. The ______________ is the amount of time that a client exercises in one week.

sample

A fitness center is interested in the average amount of time a client exercises in the center each week. The ______________ would be all of the clients that use the fitness center for a given week.

population

A fitness center is interested in the average amount of time a client exercises in the center each week. The _______________ is all of the clients of the fitness center.

parameter

A fitness center is interested in the average amount of time a client exercises in the center each week. The _______________ is the average amount of time that all clients exercise in one week.

study that no one responses to

A nonresponse bias is a _______________

quantitative — continuous

A study was done to determine the age, number of times per week and the duration (amount of time) of resident use of a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every 8th house in the neighborhood around the park was interviewed. 'Duration (amount of time)' is what type of data?

quantitative — discrete

A study was done to determine the age, number of times per week, and the duration (amount of time) of resident use of a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every 8th house in the neighborhood around the park was interviewed. 'Number of times per week' is what type of data?

systematic

A study was done to determine the age, number of times per week, and the duration (amount of time) of resident use of a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every 8th house in the neighborhood around the park was interviewed. What sampling method was used?

convenience sampling

A type of sampling that is nonrandom is _______________________. ___________________________________ involves using results that are readily available

quantitative discrete

All data that are the result of counting are called _________________ data. These data take on only certain numerical values. If you count the number of phone calls you receive for each day of the week, you might get 0, 1, 2, 3, etc.

quantitative continuous

All data that are the result of measuring are ________________ data assuming that we can measure accurately. If you and your friends carry backpacks with books in them to school, the numbers of books in the backpacks are _______________ data and the weights of the backpacks are _______________ data.

being in the past, retrospective

Case-control studies is defined by __________

easy to come by results that are meaningless

Convenient samples are __________

a specific point of time or short time

Cross-sectional studies is defined by ___________

The interpretation of this statement is using 47% as a relative frequency.

Explain what is wrong with this statement: "47 percent of the people surveyed have lived in the U.S. for 5 years."

20%

Fifty part-time students were asked how many courses they were taking this term. What percent of students take exactly two courses?

80%

Fifty part-time students were asked how many courses they were taking this term. What percent of students take one or two courses?

population

In statistics, we generally want to study a _____________ You can think of a ________________ as an entire collection of persons, things, or objects under study

quantitative measurement

Interval level of measurement is a _____________

the numerical number of 0 has no definitive meaning

Interval level of measurement is defined by _______________

rank, specific or order

Ordinal level of measurement is defined by ____________

descriptive statistics

Organizing and summarizing data is called _______________________.

random sampling

Other well-known ______________________ methods are the stratified sample, the cluster sample, and the systematic sample.

discrete continuous

Quantitative data may be either ______________________ or __________________

88.33%

Sixty adults with gum disease were asked the number of times per week they used to floss before their diagnoses. What percent flossed at most three times per week? (Round your answer to two decimal places.)

10.00%

Sixty adults with gum disease were asked the number of times per week they used to floss before their diagnoses. What percent of adults flossed six times per week? (Round your answer to two decimal places.)

simple random sample

The easiest method to describe is called a _______________________. Two __________________________ contain members equally representative of the entire population.

inferential statistics

The formal methods are called _______________. it uses probability to determine if conclusions drawn are reliable or not

statistics

The science of ____________ deals with the collection, analysis, interpretation, and presentation of data.

stratified sample

To choose a __________________, divide the population into groups called strata and then take a sample from each ____________. For example, you could _______________ (group) your college population by department and then choose a simple random sample from each ___________ (each department) to get a ____________________________

systematic sample

To choose a _______________________, randomly select a starting point and take every nth piece of data from a listing of the population.

cluster sample

To choose a ___________________________ divide the population into strata and then randomly select some of the strata. All the members from these strata are in the ________________________. For example, if you randomly sample four departments from your stratified college population, the four departments make up the ___________________.

sample

To study the larger population, we select a ______________.The idea of__________________ is to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population.

4/19

What fraction of the people surveyed have lived in the U.S. 7 or 12 years?

11/19

What fraction of the people surveyed have lived in the U.S. at most 7 years?

09/19

What fraction of the people surveyed have lived in the U.S. fewer than 7 years?

10/19

What fraction of the people surveyed have lived in the U.S. from 4 to 12 years, inclusive?

Qualitative

________________ data are the result of categorizing or describing attributes of a population. Hair color, blood type, ethnic group, the car a person drives, and the street a person lives on are examples of ________________ data. ___________________ data are generally described by words or letters.

Probability

_____________________ is the mathematical tool used to study randomness. It deals with the chance of an event occurring. For example, if you toss a fair coin 4 times, the outcomes may not be 2 heads and 2 tails.

Quantitative

______________________ data are always numbers and are usually the data of choice because there are many methods available for analyzing the data. ________ data are the result of counting or measuring attributes of a population. Amount of money, pulse rate, weight, number of people living in your town, and the number of students who take statistics are examples of _______________ data.

controlled, concluded it's cause and effect, randomized, divided and intentionally changed.

a designed experiment is ________________

responses that are untruthful

a response bias are ___________

a study that cannot claim

conservational study is __________

measured, can be time and is an infinite amount

continuous quantitative is _________________

countable and never halves and finite

discrete quantitative is _____________________

measuring values without influence. ex. survey

observational study is _______________

selections by chance

obtaining random samples are ________________

Ordinal level of measurement is a ___________

qualitative measurement

ratio level of measurement is a ______________

quantitative measurement

the numerical number of 0 that has a definitive meaning

ratio level of measurement is defined by ____________

"number of"

red flag for discrete quantitative is ___________

a technique used to obtain samples that tend the favors of only one part of the population.

sampling bias is ___________

how many seconds it takes for a driver to respond

you are concerned about the effects of texting on driving performance. Design a study to test the response time of drivers while texting and while driving only. how many seconds does it take for a drive to respond when a leading car hits the brakes? Describe the response variable

Driving while texting driving

you are concerned about the effects of texting on driving performance. Design a study to test the response time of drivers while texting and while driving only. how many seconds does it take for a drive to respond when a leading car hits the brakes? What are the treatments?