Can pleasant aromas help a student learn better? Two researchers believed that the presence of a floral scent could improve a person’s learning ability in certain situations. They had 22 people work through a pencil-and-paper maze six times, three times while wearing a floral-scented mask and three times wearing an unscented mask. The three trials for each mask closely followed one another. Testers measured the length of time it took subjects to complete each of the six trials. They reported that, on average, subjects wearing the floral-scented mask completed the maze more quickly than those wearing the unscented mask, although the difference was not statistically significant. This study is:

Identify the variable hair color as:

Which histogram displayed as a larger class width?

Evaluate∫dxx3x2−4. Simplify your answer. You must show all your work for full credit.

A marketing company offers to pay $25 to the first 100 persons who respond to their advertisement and complete a questionnaire regarding displays of their client’s product. This situation is an example of which of the following?

Consider the following statement concerned with the collection of data, and determine the best selection of terms to complete the statement:  “The unknown value of the variable in a population is called the _______________. In order to determine an estimate known as the _______________, we draw a ____________ from the population.”

The two dot plots below display frequency distributions of the height of the players on two women’s basketball teams.  Which statement best describes the standard deviation of the two data sets (you do not have to calculate them!)?

A certain researcher is interested in determining whether fourth grade boys are on average taller than fourth grade girls. To gather evidence, the researcher divides the class into boy and girls and randomly selects 10 students from each group. This sampling technique is known as:

In a 1927-32 Western Electric Company study on the effect of lighting on worker productivity, productivity increased with each increase in lighting but then also increased with every decrease in lighting. If is is assumed that the workers knew a study was in progress, this is an example of:

The five-number summary for scores on a Statistics exam is 11, 59, 75, 79, 93. In all, 80 students took the test. About how many students had scores between 11 and 79?