Unit 1 check: Exploring One-Variable Data and Collecting Data

A state wildlife agency wants to know the mean length of the largemouth bass in a large lake. Which is the best reason it uses a statistical study instead of measuring every fish?

Two clubs report how many members ordered the vegetarian meal at their end-of-year banquet. Robotics: 18 of its 45 members. Debate: 14 of its 28 members. Which statement is correct?

Use the two charts for the freshman and senior samples above. Which claim do the charts support?

Twenty-four students recorded how much battery their phones had left, in percent: 12, 18, 23, 27, 31, 34, 36, 40, 41, 42, 45, 47, 48, 51, 53, 55, 58, 60, 64, 67, 71, 76, 83, 91. In a relative frequency histogram with bins 20 points wide starting at 0, how tall is the bar for the 40 to 60 bin? Each bin includes its left endpoint.

A histogram of the prices of 150 used cars listed for sale in a city has a tall peak around 8,000 dollars and a long tail that stretches out toward 40,000 dollars. Which describes its shape?

For the 120 employees of a company, the mean commute distance is 18.4 miles and the median is 11.2 miles. What is the most likely shape of the distribution of commute distances?

In a random sample of employees at a company, commute times have a mean of 32 minutes and a standard deviation of 8 minutes. One employee's commute has a z-score of $-1.25$. How long is that employee's commute?

A coach believes that the mean mile time is different for students on her team who train in the morning and students on her team who train after school. Which investigative question matches her belief and includes all three components?

A state wants to survey high school teachers about class sizes. It numbers its 210 high schools, randomly selects 12 of them, and surveys every teacher at those 12 schools. Which sampling method is this?

A survey asks, "Since texting while driving causes thousands of crashes, do you support a law banning phone use while driving?" What kind of bias is most likely?

In a vaccine trial, the participants do not know whether they received the vaccine or a saltwater shot, and neither do the nurses who give the shots and check on the participants afterward. What is this feature of the design called?