Guest practice

Ch 16

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David is measuring the volume of a liquid. He reads the volume at eye level to avoid parallax error. What is parallax error?

A An error due to incorrect calibration B An error due to reading the measurement from an angle C An error due to temperature changes D An error due to using wrong units

A graph must always include:

A Only data points B Title and labeled axes C Pictures D Colors

Bilal is analyzing data from an experiment and finds that the data is not normally distributed. What does this indicate?

A The data is perfectly symmetrical B The data may be skewed or have outliers C The data is invalid D The data has no variability

Calibration of instruments improves:

A Precision only B Accuracy C Graphing D Hypothesis

Nora is recording the pH of a solution over time. She notices that the pH values are fluctuating. What should she do to improve the accuracy of her data?

A Ignore the fluctuations B Take more readings and average them C Stop the experiment D Change the pH meter

Xia is analyzing data from an experiment and finds a correlation between two variables. What does a correlation indicate?

A That one variable causes the other B A relationship between two variables C That there is no relationship between the variables D That the data is invalid

George is studying the effect of acid concentration on the rate of reaction with magnesium. He measures the volume of hydrogen gas produced. What is the dependent variable in this experiment?

A Acid concentration B Volume of hydrogen gas produced C Mass of magnesium D Temperature

Which type of data is temperature?

A Qualitative B Quantitative C Descriptive D Categorical

Tina is analyzing data from an experiment and calculates the standard deviation. A small standard deviation indicates that the data points are:

A Far from the mean B Close to the mean C Randomly distributed D Invalid

A fair test requires:

A Multiple independent variables B Controlled conditions C No measurements D Assumptions

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