Blatchley Chapter 04 Posttest

. A scientist is examining whether prescribing a certain amounts of sunlight influence the type of flower that develops on a plant. She has noticed that the plant can led to star shaped, round shaped, and long shaped flowers. She exposes the plant to varying amounts of time in the sun, and counts the different types of flowers that grow. What type of measures of center can she use as a descriptive statistic that is suitable for her data?

She can only use the modes

She can calculate means and use the mode

She can calculate means, medians, and use modes.

She can use medians and means

. In a unimodal distribution, the data shows a mean that is smaller than the median. The mean and median are both smaller than the mode. What does this tell you?

The distribution has more than one mode

The distribution is normally distributed

The distribution is negatively skewed

The distribution is positively skewed

. Imagine a dataset of 500 observations. One random datum changes value. Which of the following is most likely to be affected?

The mean

The median

The mode

The number of total observations

. The text discusses three measures of central tendency. How are they best compared?

They measure the same exact characteristic of a dataset: the center.

They each have their strengths and limitations.

The mean is the only one that is a true "center" of a dataset.

The mode is generally the best and most commonly used measure of center.

. A researcher lost a participants' data from experiment on word recall. The mean number of words recalled was 7.5 and there were 12 observations? The other 11 data points are: 6, 8, 7, 9, 6, 7, 8, 6, 7, 9, 10. What was the missing value?

8

7

6

5

Blatchley Chapter 04 Posttest

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