Exam 1: Introduction to Data

In a recent study of 1200 adult smokers, 125 out of the 560 males in the study said they were interested in joining a help group to quit smoking. What percent of the study's participants were female?

Researchers conducted an experiment to determine if riding a bike to school improves attention span. What are the treatment and outcome variables?

Determine whether the following data table is stacked or unstacked and explain your reasoning.

Use the following information for following questions: A group of 500 patients who suffer from hypothyroidism, a condition in which your thyroid does not produce enough of certain hormones, were asked to participate in a study to determine the effectiveness of a new medication. The patients were randomly divided into two groups, one that was given the actual medication, and one that received a placebo pill. The results of the study are below. -What percent of patients who took the medication had improved symptoms?

Use the following information for following questions: A group of 500 patients who suffer from hypothyroidism, a condition in which your thyroid does not produce enough of certain hormones, were asked to participate in a study to determine the effectiveness of a new medication. The patients were randomly divided into two groups, one that was given the actual medication, and one that received a placebo pill. The results of the study are below. -Can we conclude that the improved symptoms were caused by the new medication?

In a recent high school poll, the principal asked if students were satisfied with the amount of after-school activities offered. What is the population of interest here?

According to the following data table, which variable(s) is(are) categorical?

Determine if the following scenario is an observational study or a controlled experiment. A doctor is interested in determining whether a certain medication increases the risk of high blood pressure. He randomly selects 100 people for his study - 50 who will take the medication, and 50 who will take a placebo. He checks the patients' blood pressures weekly for six months.

According to the following two-way table, what percent of people in the sample prefer dogs?

Determine if the following scenario is an observational study or a controlled experiment. A doctor is interested in determining whether a certain medication increases the risk of high blood pressure. He reviews his patients' medical records and finds that a higher proportion of people who take the medication are suffering from high blood pressure.

A gym is offering a new 6-week weight loss exercise program for its members. Members who sign up for the program are weighed and measured once a week for the duration of the program. The owners of the gym want to know if the weight loss program actually helps people lose weight. What variable could be a possible confounding factor in determining the cause of weight loss?

A two-way table is useful for describing which types of variables?

Coconut oil has become quite popular in recent years. People who use coconut oil claim it helps with hair care, skin care, stress relief, weight loss, and a boosted immune system. Can we conclude that the use of coconut oil causes these health benefits?

The following data table is organized using which method?

Use the following information for following questions: A group of 500 patients who suffer from severe migraines were asked to participate in a study to determine the effectiveness of a new medication. The patients were randomly divided into two groups, one that was given the actual medication, and one that received a placebo pill. A good outcome was defined as a reduction in the number of migraines during a month's time. The results of the study are below. -Was the new medication effective for reducing migraines? Explain your reasoning and include any calculations.

In a study of 1200 adults, 480 out of the 630 women in the study said they attended a state college or university. What percent of the study's participants were women?

What is the difference between a blind and a double blind study? Which is most ideal?

What does it mean for an experiment to be random?

A two-way table could be used for which of the following pairs of variables?

In a study of 1350 elementary school children, 118 out of the 615 girls in the study said they want to be a teacher when they grow up. What percent of the study's participants were boys?