Topic Test_October 6, 2020 period 6

Which method of collecting data would be best served for a study to determine the effect a tidal wave would have on Los Angeles?

Choose:

• survey

• simulation

• designed experiment

• observational study

Answer explanation

Great , it is dangerous!

The winning times of the women’s 400-meter freestyle swimming at the Olympics are listed below. Times have been rounded to the nearest hundredth of a minute.

Find the standard deviation of these times to the nearest hundredth of a minute.

For which of the following sets of data is the mode 5?

• 3, 6, 5, 8, 1, 5, 9, 5

• 2, 4, 1, 5, 7, 5, 2, 2

• 5, 0, 1, 2, 1, 4, 1, 0

• 8, 4, 8, 8, 3, 5, 5, 1

. Ms. Brodie drew two box-and-whisker plots to represent her students’ scores on the mid-year test and the final exam. What do the plots tell you about the progress of Ms. Brodie’s class?

The table below shows the first-quarter averages for Mr. Harper’s statistics class.

What is the population variance for this set of data?

• 8.2

• 8.3

• 67.3

• 69.3

A sociologist reviews randomly selected surveillance videos from a public park over a period of several years and records the amount of time people spent on a smartphone. The statistical procedure the sociologist used is called

• a census

• an experiment

• an observational study

• a sample survey

Which task is not a component of an observational study?

• The researcher decides who will make up the sample

• The researcher analyzes the data received from the sample.

• The researcher gathers data from the sample, using surveys or taking measurements

• The researcher divides the sample into two groups, with one group acting as a control group.

Answer explanation

You’re Sharp!

Student Council is trying to decide upon a theme for the spring dance. They have narrowed the choices to four options and are going to survey the 12th grade class.

Which method would produce the best representative sample?

• Survey the 12th grade students in Mrs. Arnold's art class.

• Survey every fifth 12th grade student entering the school one morning.

• Survey all of the 12th grade students attending the football game.

• Survey the 12th grade students in Mr. Allen's math class.

A survey was conducted of 150 randomly selected students asking:

"Which social media do you check first at the end of a school day?".

The results are shown in the table :

The results of this survey are used to make a generalization regarding all of the 650 students in the school building. Based upon this survey, what would be the number of students in the building who first check Facebook at the end of the school day?

• 140

• 204

• 208

• 217

Temperature and the calendar year are examples of a measurement scale known as

• interval

• .nominal.

• ratio.

• ordinal.