Jay wants to study nutrition and performance in schools using available data.
Which of the scenarios below will provide Jay with available data?
Going
... [Show More] to a local high school and asking the principal for information about students' current and previous grades, then asking the health teacher for the results from a survey students took in health class
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
It's Saturday afternoon, and Denise is going shopping. She stops by a department store because she needs a new pair of shoes. She has picked out three styles that she likes. The store associate asks, "What is your shoe size?"
Which type of question has the store associate asked?
Closed question
A local gym conducts a survey among the people in a mall.
Which survey question would have a qualitative response?
Do you exercise daily?
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 survey
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?
Convenience sampling
An appliance store manager noted that the sales of home appliances contributed 74% of the store's profits in the year 2010 and 82% in the year 2011.
Of the following choices, which statement about home appliance sales is true?
Home appliance sales increased profits by 8 percentage points
Rob sent an email survey to 2,000 cell phone owners asking about their satisfaction with their current plan. Only 256 people returned the survey and they were predominately 18-24 years old.
Which of the following statements is true?
The survey likely has bias because the people who could not answer differ from those who did answer.
A travel agency contacted a department store and obtained the list of all people who made purchases using their credit cards at the store in the last month. The agency then surveyed a random sample from the list, calling them to ask their preference for air travel or train travel for taking holidays.
Which of the following types of bias affects the conclusions of the survey?
Selection bias
A new pet food product for small dogs has been developed to help with tooth decay. Fifty-two dogs participate in the study. Each dog owner picks a card from a standard deck out of a hat. If the card is red, their dog will be in the treatment group. If the card is black, their dog will be in the placebo group.
Which experimental design was used?
Completely Randomized Design
A different coffee seller offered to sell coffee to Jenae's company for half the cost of their current brand. Jenae knew her co-workers were really partial to the coffee they drank now, so she decided to conduct a study to see if they noticed the difference in flavor. Her co-workers were convinced they would.
Jenae provided each person with a sample and said that some had the new coffee and some did not. Only Jenae knew who had which brand of coffee.
Jenae's strategy is an example of a(n) ________.
blind experiment
A survey was conducted to find the frequency with which people go to the movies. A group of 120 people in a mall were asked about how often they go out for a movie and It was found that 36 people go to movies at least once in a month.
Which of these is an example of descriptive statistics?
30% of the people surveyed in the mall go to movies at least once in a month.
Select the correct statement regarding experiments.
A researcher can control the environment and observe the response
Scientists want to test a new pair of running shoes. A speed test is performed with two separate groups of participants. The treatment group will wear the new pair of running shoes, while the control group will not. It is believed that age and height may affect speed.
Which of the following would be most effective in controlling the confounding variables, such as age and height, in this study?
A matched-pair design experiment
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 14 teachers in Ryan's sample, and 376 teachers are in the population.
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 1983 would be equivalent to $189.70 in 2004.
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 __________.
Simple random sampling
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%
A scientist is conducting a study on the effect of eating chocolate and overall mood. They believe that gender is a significant factor. The participants are divided by gender. Then, within each group, participants are randomly assigned to consume either chocolate or a placebo and then rate their mood for the day. This experiment will run for two weeks.
Which type of experimental design does this situation describe?
Randomized Block Design [Show Less]