Blatchley Chapter 04 Quiz

. Another way to say the mean of a sample is the...

a) Sum.

b) Arithmetic average.

c) Range.

d) Midpoint.

. What is the median?

a) It is the sum of observations divided by the total number of observations in a dataset.

b) It is the midpoint of the data, ranked in order of size.

c) The largest data point subtract the smallest data point.

d) The most frequently occurring response.

. Which if the following does not describe the mean?

a) the arithmetic average

b) the sum of the scores divided by the number of scores

c) a measure of central tendency that uses every single data point

d) a measure of variability

. The mode of a data set is the...

a) The exact mid point in a dataset after ranking all data points in order.

b) The sum of all scores divided by the number of scores.

c) The largest data point subtract the smallest data point.

d) The most frequently observed score in a dataset.

. Consider the data set that consists of: 1, 3, 3, 3, 4, 5. 3 is the...

a) Median only.

b) Median and mode.

c) Median, mode, and mean.

d) Mean only.

. In statistics, the mean, median, and mode are often used to represent what is considered "typical" in a data set. What does "typical" mean in this context?

a) The variability in the data.

b) It means that most datasets can be explained by the same numeric value for the mean, median, and mode.

c) It refers to a measure of central tendency.

d) It refers to a measure of how precise the estimates are.

.

Use this data to respond to questions 7 through 9

Consider this data, showing the number of digits they can recall in a digit span task: 5, 8, 10, 9, 8, 8, 7, 5, 6, 7, 8, 6.

What is the mean of the data?

a) 7.25

b) 7

c) 87

d) 12

. What is the median of the data?

a) 7

b) 7.5

c) 8

d) 5

. What is the mode of the data?

a) 5

b) 6

c) 7

d) 8

. The use of x̄ (or x-bar) refers to the...

a) mode.

b) median.

c) arithmetic average.

d) number of observations.

. In a dataset of 50 individuals, a researcher requested that they provide their annual income. The max value is 2,000,000 and the mode is 55,000. The researcher decided that 2,000,000 is an outlier and does not represent the population that he is studying. Therefore, he excludes this participant. Which of the following must be true?

a) The mode decreases

b) The mean decreases

c) The total number of observations and the mean decreases

d) The total number of observations, the mode, and the mean all decrease

. In a dataset that has no mode, but the mean and median are equal, which is likely true?

a) The distribution must be bimodal.

b) The distribution must be unimodal.

c) This distribution is a uniform distribution.

d) None of the above are possible.

.

Use it to answer questions 14, 15 and 16.

Here are data of 10 individuals’ data reporting their subjective wellbeing on a scale from 1 (lowest) to 100 (highest): 66, 79, 78, 85, 50, 89, 92? (H, p10, 11, 12).

What is the mean of the sample?

a) 77

b) 79

c) There is no mean because all the values occur equally frequent

d) 92

. Which of the following best describes the relationship between the mean and the median in this sample?

a) They are the same

b) The median is larger

c) The mean is larger

d) The median cannot be determined in this sample because the sample is too small.

. What is the mode of the sample?

a) 77

b) 79

c) 85

d) There is no mode.

. A researcher is entering data into his computer on hourly pay rates. Instead of typing in 10, he entered 1,000 for one particular data point. What is the most likely outcome of this error?

a) The mode will increase drastically

b) The mean will increase drastically

c) The median will increase drastically

d) The mean and the median will increase drastically

. In a negatively skewed distribution, it is the case that...

a) There is a long tail to the right of the center.

b) The median is no longer the mid point of the data.

c) The mean is likely larger, in value, than the mode.

d) The median is likely smaller, in value, than the mode.

. When a distribution is positively skewed?

a) The mode is the largest, in value, of the three measures of center.

b) The median is the most frequently occurring observation.

c) The mean is more heavily influenced by outliers than the median.

d) The mode is more heavily influenced by outliers than the median.

. How are skewed distributions best characterized or described?

a) They cause outliers to be in the data

b) They affect the median more than the mean

c) They are never generalizable to the population

d) They affect the mean more than the mode

.

BDI Score	ƒ
1-7	68
8-14	97
15-21	64
22-28	59
29-35	44
36-42	42
43-49	39
50-56	12
57-63	6

With grouped data, how does one obtain the mean, median, and mode?

a) you use the minimum value of each group and calculate them the same way as you would with ungrouped data

b) you use the midpoint value of each group and calculate them the same way as you would with ungrouped data

c) you use the maximum value of each group and calculate them the same way as you would with grouped data

d) Because there are no exact values, you cannot calculate the mean, median, and mode without the raw data

. How do measures of central tendency relate to the kind of data that you have?

a) Modes are only used for nominal data and means are only used for ordinal data

b) Modes are only used for ordinal data, whereas median and means can be calculated for all kinds of data

c) Modes are only used for nominal and ordinal scale data, and medians are used for ratio scale data online

d) None of the above are correct

. Of the three measures of central tendency that were discussed, which is most appropriate to use for data on a nominal scale?

a) median

b) mode

c) mean

d) all are appropriate

. A video gaming company is looking at which genre of games they are selling most. When aggregating the data, which type of descriptive statistic is most meaningful?

a) median

b) mean

c) mode

d) mode and mean

. A data scientist is looking at the number of characters the average twitter user types in their tweets. When aggregating the data, which of the following measures of central tendency are appropriate?

a) median, mean, and mode

b) median and mode only

c) mean and median only

d) mean only

. A research conducting a study with individuals who suffer form insomnia was examining the effects of two drugs and a control group (a placebo pill). She has data on how the number of hours each person spent sleeping after experiencing a drug or placebo. Which of the following are suitable for her dataset?

a) She can calculate means, medians, and mode for each condition.

b) She can calculate means and medians for each condition, but only the mode is only suitable for the entire group without regard for the conditions.

c) She can calculate means only.

d) She can calculate means and modes. Medians are obsolete in this case.

Blatchley Chapter 04 Quiz

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