Levels Tought:
Elementary,Middle School,High School,College,University,PHD
Teaching Since: | Apr 2017 |
Last Sign in: | 5 Days Ago |
Questions Answered: | 7559 |
Tutorials Posted: | 7341 |
BS,MBA, PHD
Adelphi University/Devry
Apr-2000 - Mar-2005
HOD ,Professor
Adelphi University
Sep-2007 - Apr-2017
1
To determine what percentage of 376 teachers at a university were female, Ryan randomly selected 14 teachers. He then collected and analyzed his data.
Select the statement that is TRUE.
There are 376 teachers in Ryan's sample, and 14 teachers are in the population.
None of the answer choices are true.
There are 14 teachers in Ryan's sample, and 376 teachers are in the population.
There are 14 teachers in Ryan's sample, and 362 teachers in the population.
2
A poll was conducted two weeks before an election and showed that the incumbent would win with 54% of the vote, with a 3% margin of error.
What is the confidence interval for this poll?
51% to 57%
48% to 60%
54% - 3%
54% + 3%
3
A survey conducted among students in the school cafeteria asked a set of questions listed below.
Which survey question would produce a qualitative response?
How many cups of fruit juice do you drink daily?
What is your favorite dish?
How many servings of fruit do you eat each day?
How many hours do you spend reading books every day?
4
Jenae noticed that many of her co-workers would opt for the coffee that appeared to be most recently brewed, regardless of the flavor of the coffee offered. This leads her to believe that what she was witnessing was not really representative of everyone's true flavor preferences. She adapted her experimental study accordingly.
Select one control in Jenae's experimental study.
Jenae takes note of the frequency in which co-workers refill their coffee mugs.
Jenae monitors the habits of the co-workers who do not drink coffee.
Jenae places condiments at random places throughout the kitchen.
Jenae keeps the same amount of sugar and artificial sweetener at each location.
5
On a candy production line, 3% of bags are overfilled. An employee randomly selects 100 bags and finds that 5% are overfilled. A second employees takes another random sample of 250 bags and finds that 2% are overfilled.
Which of the following explains why there is a difference between the two percentages?
Both samples suffered from non-response bias.
The samples were not random samples.
Random error; the numbers were different due to variability inherent in sampling.
The sample sizes were both too small, which is why they both obtained figures different than 3%
6
Of 400 randomly selected people in the city of Lyon, France, 60 people had the first name Hugo.
Which of these does NOT represent inferential statistics?
15% of the people who live in Europe have the first name Hugo.
15% of the people surveyed have the first name Hugo.
15% of the people who live in Lyon have the first name Hugo.
15% of the people who live in France have the first name Hugo.
7
Jenae is able to purchase a different brand of coffee for half the price from a new supplier. She anticipated that her co-workers would object to switching to the new brand, as they were really partial to the coffee they have been drinking so far. Indeed, when offered a taste test of the old brand versus the new brand, her co-workers unanimously rejected the new brand.
Jenae's boss, Steven, pointed out that this result was most likely due to the fact that the taste test was not ________.
blinded
randomized
controlled
replicated
8
Which of these random samples represents a representative sample of the number of students in a middle school who walk to school?
150 random students at lunch
25 random 8th graders
All students in chess club
5 students in the hallway
9
A local bakery conducts a phone survey to find the most popular types of cakes. They selected 100 random phone numbers from the local telephone directory and called them.
This type of sampling method is called __________.
Convenience sampling
Systematic random sampling
Simple random sampling
Multi-stage sampling
10
A local school newspaper's editor wants to survey students to determine the approval rating of the current student council president.
How would the newspaper apply the cluster sampling method to find this information?
The newspaper staff surveys only the female students in the entire school.
The newspaper staff surveys every student in a randomly selected grade.
The newspaper staff surveys random students from every grade in the school.
The newspaper staff surveys 30 students from each grade in the school.
11
A student group on a college campus wanted to create a survey about parking availability on campus. The student group randomly selected 300 students to take the survey. One of the questions read, “Many students believe the lack of available parking is a major problem. Do you agree or disagree?” Of the 300 students that took the survey, 285 surveys were returned.
This survey will most likely suffer from which of the following types of bias?
Non-response bias
Selection bias
There is no bias in the way this survey is carried out.
12
Regan wants to study how reading on a computer affects comprehension among elementary school students. Regan thinks that girls and boys might differ and he also suspects that grade level will affect the results. He decides to create a male and a female group for each grade. Within each group, he randomly assigns half of the students to read an article on paper and half of the students to read the article on a computer.
Which type of experimental design does this situation illustrate?
Matched-Pair
Double-Blind
Randomized Block
Completely Randomized
13
Select the correct statement regarding experiments.
A researcher can neither control the environment nor observe the response.
A researcher can control the environment but cannot observe the response.
A researcher cannot control the environment but can observe the response.
A researcher can control the environment and observe the response.
14
The following shows the Consumer Price Index (CPI) for the years 2000-2005. All of the values use a reference year of 1983.
Which of the following is true about the CPI, based on the information?
$100 in 2005 would be equivalent to $194.50 in 1983.
$100 in 1983 would be equivalent to $172.40 in 2000.
$100 in 2001 would have been worth 189.70 in 1983.
$100 in 2000 would be equivalent to $183.70 in 2003.
15
The owner of a pizza parlor called every fifth person who ordered pizza last week to rate the pizza.
What type of statistical study is this?
A census
An observational study
A survey
An experiment
16
To compare the teaching methodologies of two of its eighth-grade math teachers, a school decides to compare student test scores from the two classes throughout the year.
Which type of statistical study is the school conducting?
Prospective observational study
Retrospective observational study
Matched-pair design study
Meta-analysis
17
James conducts a survey to study the relationship between cell phone use and grades earned during the fall semester. James suspects that there might be a lot of other factors that affect grades besides cell phones.
Which of the following could be a confounding variable in James's study?
Time spent studying
Grade earned during the spring semester
Time spent using a cell phone
Grade earned during the fall semester
18
The traffic volumes at a major intersection in New York were surveyed every day between one and four in the afternoon for a month to study the traffic patterns in the city.
Which of the following types of bias affects the conclusions of the survey?
Non-response bias
Response bias
Deliberate bias
Selection bias
19
Which of the following data types will be continuous?
The number of students who like chocolate or strawberry or vanilla ice-cream flavors
The number of books in the school library
The amount of snow that fell last night
The letter grade Tyron received on an English test
20
In 2007, 4% of people buying new cell phones purchased a bluetooth earpiece during the same transaction. In 2012, 28% of people buying new cell phones purchased a bluetooth earpiece during the same transaction.
Of the following choices, what is correct about the growth of bluetooth sales?
It rose by 120 percentage points.
It rose by 24%.
It rose by 24 percentage points.
It rose by 12%.
21
Melissa is conducting a survey of her classmates because her teacher wants the class to learn more about hygiene habits. Melissa has developed a list of 10 questions. “Do you brush your teeth every day?” is the first question she asks.
Which type of question is Melissa asking?
Closed and binomial question
Open question
Closed question
Open and binomial question
22
The manager of a food company wants to conduct a survey to find out whether consumers like or dislike a new brand of soup that was recently launched.
Which of the following data collection methods is mostly likely to get unbiased results?
Ask customers who visit retailers within a 15 mile radius of the company headquarters.
Ask customers who visit the grocery store nearest to the manager's house which soup they like the best.
Ask the employees in the company which soup is the best.
Ask distributors who supply the products to local retailers about the popularity of different soup brands.
23
A factory manufactures motorcycles. One of its employees, working in the quality control department, checks the first 10 and the last 10 motorcycles manufactured in a day.
This is what type of sampling?
Stratified sampling
Voluntary response sampling
Systematic sampling
Convenience sampling
24
Researchers want to study the effects of classical music and memory. One group of participants will take a memory test with classical music playing in the background, while the other group will take the memory test in complete silence. It is believed that age has an effect on memory.
Which of the following would work best to test if classical music has an effect on memory?
A completely randomized design experiment
A randomized block design experiment
A matched-pair design experiment
A case-control observational study
25
James participated in an archery competition. He was allowed four attempts and was supposed to hit the bullseye in the center of the board.
If the figure shows the positions of James' arrows, which of the following would best classify the arrangement of arrows?
Low accuracy and low precision
High accuracy and high precision
Low accuracy and high precision
High accuracy and low precision
26
To test the effectiveness of a new, cholesterol-lowering drug, a group of researchers recruits 200 volunteers with high cholesterol to take part in a study. The researchers place the numbers 1 through 200 in a hat and have each participant select a number. Those who picked an odd number receive the new drug, while those who picked an even number receive a placebo.
Which experimental design are the researchers using?
Randomized Block Design
Matched-Pair Design
Representative Sample Design
Completely Randomized Design
27
A retail brand plans to open its stores across all cities with a population of more than one million. To prepare for this, it refers to the past year's census done by the government.
Which statement accurately describes the type of data the retail brand is using?
The retail brand is relying on raw data because it has to ask for permission to use the census.
The census is an example of raw data because the government provides it.
The census is an example of available data because the government provides it.
The retail brand is relying on available data because customers provide information to the census.
28
Aaron has designed a trial to test a new energy drink. Fifty individuals in the treatment group try the new energy drink every day for two weeks, and they describe a moderate increase in their energy levels. Fifty individuals in the control group drink sugar water every day for two weeks, and they describe a significant increase in their energy levels.
What has Aaron observed?
A sampling error
A confounding variable
The placebo effect
The margin of error
29
Cindy measured and recorded the temperature of a liquid for an experiment. She used a poorly calibrated thermometer and noted the temperature as 100.5 degrees Fahrenheit. The actual temperature of the liquid was 95 degrees Fahrenheit.
The percent error in her calculation is __________.
4.08%
-4.08%
-5.79%
5.79%
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