Exam 1: Introduction to Data

The two-way table below shows the survey results when sixty adults were asked whether they had made a clothing purchase in the last thirty days. Male Female Purchased clothing in the last thirty days. 10 29 Had not purchased clothing in the last thirty days. 10 11 -What percentage of the sample had not made a clothing purchase in the past thirty days?

Consider the following statement, "In a nationwide study, children on an all-organic diet are more alert in school than those not on an all-organic diet." Which of the following is a plausible confounding variable in this study?

The two-way table below shows teenage driver gender and whether or not the respondent had texted at least once while driving during the last thirty days. Teenage driver- Male Teenage driver- Female Texted at least once while driving during past 30 days. 5 7 Had not texted at least once while driving during the past 30 days. 11 9 -What percentage of the sample were female drivers?

The number of parents who attended parent teacher conferences at a local elementary school is an example of what type of variable?

Which of the following measurements is likely to have the least variation?

The following is reported in a local newspaper: "The majority of Michigan voters want to keep the individual pricing law. A poll of 600 voters showed 51% wanting to keep the law and 39% supporting its repeal." -Consider the statement "Data are numbers in context." Consider a randomly selected group of newborn babies born in a large city. Describe one possible type of numerical data that could be reported about this group that might be of interest to obstetricians.

A group of college students was given a new energy drink then asked to record their level of alertness at midday. In this example,_{--------------------} is the treatment variable and_{--------------------} is the outcome variable.

In a study of 900 adults, 45 out of the 325 men in the study said that they preferred to rent a movie on DVD rather than going out to a movie theater. -What is the approximate percentage of men in this study who prefer to rent a movie on DVD?

In a study of National Hockey League statistics, the data of Stanley cups wins per team and the number of fights on the ice during Stanley cup play-off games was compared. It is found that there is a positive correlation between the number of fights on the ice of a NHL team and the number of Stanley cup wins for that team. That is, NHL teams with more fights on the ice tend to have more Stanley cups. A sportscaster makes the following statement: "If a team wants to win a Stanley cup the players should start as many fights on the ice as possible." What is wrong with the sportscaster's statement?

In a survey, high school graduates were asked "Did you play sports in high school?" The response was electronically recorded as a "1" for yes and a "0" for no. This is an example of_{--------------------} .

A sample of 984 voters was asked in a survey, "Do you support your state's helmet law for motorcycles? " The results are summarized in a two-way table: Male Female Support the helmet law 214 380 Oppose the helmet law 185 205 -How many men are in this sample? What percent of the sample are men? Round to the nearest whole percent.

Identify the sample and the population it is most likely intended to represent: The manager at a bicycle store asks 30 customers if they would be = interested in participating in a weekly group ride.

Consider the following statement "My child was bullied on the school bus and so was my neighbors child, so obviously, bullying is a big problem on school buses and something needs to be done about it!" What is wrong with this statement?

Answer the question using the following table showing fatal injury counts by four major categories from 2004-2009 for Michigan Residents. The table shows total counts for all ages and both sexes. Fatal injuries Unintentional Injuries 3,244 3,353 3,496 3,655 3,624 3,589 Self-inflicted/Suicide 1,096 1,103 1,132 1,123 1,173 1,164 Assault/Homicide 672 673 720 702 642 658 All other fatal injuries 466 404 414 446 446 506 All fatal Injuries 5,478 5,533 5,762 5,926 5,885 5,917 -Write a statement comparing the rate of fatal injuries that were self-inflicted or suicide from 2005 to 2006. Why is it important to compare rates and not total numbers?

Indicate whether the study described is an observational study or a controlled experiment. -The smoking rates of teens in urban areas are compared to those living in rural areas to see whether teens living in rural settings have higher rates of smoking.

Consider the following statement: "Researched conducted a large observational study and determined that children who participated in school music programs scored higher on math exams in later grades than those who did not." Suppose that upon hearing this a politician states that all children should participate in school music programs. What is wrong with the politician's statement?

In a sample of 800 first-year college students, 72% said that they check their Facebook page at least three times a day. How many students is this?

Indicate whether the study described is an observational study or a controlled experiment. -A group of cancer patients is divided into two groups. One group is given a new drug to fight the side effects of chemotherapy and the other group is given a placebo. After three months they are asked to respond to a questionnaire about the frequency and severity of their side effects to see whether the new drug improved the overall negative side effects of chemotherapy.

Marital status of each member of a randomly selected group of adults is an example of what type of variable?

The deacons at a local church surveyed the congregation to find out if members would be willing to fund a new construction project. In this example, what is the population of interest?