Stats quiz 2024

Which of the following is the range of Rachel’s scores?

• 6

• 8

• 9

• 15

Which of the following is the median of Rachel’s scores?

• 6

• 9

• 9.5

• 10

A psychologist administered the most recent edition of the Stanford-Binet IQ test to 50 students and their scores are shown in the chart above. How many students earned scores higher than two standard deviations above the mean?

• 2

• 3

• 8

• 10

If the researchers graphed the results of the stress survey, which of the following statements would be the best prediction about the distribution of scores?

• The distribution of scores would likely appear as a normal distribution.

• The distribution of scores would likely be skewed toward high stress.

• The distribution of scores would be skewed toward low levels of stress.

• The distribution of scores would be negative.

A test examining the level of sensation-seeking has a mean of 80 with a standard deviation of 4. Which of the following scores is within one standard deviation of the mean?

• 75

• 77

• 85

• 88

What is the mode for these data: 3, 4, 5, 5, 7, 7, 7, 8, 8, 10?

• 4

• 5

• 6

• 7

What is the mean for these data: 3, 4, 5, 5, 7, 7, 7, 8, 8, 10?

• 6

• 6.4

• 7

• 7.33

Approximately what percentage of students scored between 50 and 80 in a normal distribution with a standard deviation of 10?

• 34%

• 68%

• 95%

• 99.7%

The figure shows the distribution of scores on an intelligence test in the general population. As shown in the figure, the mean of the distribution is 100 and the standard deviation is 15. What percentage of the population has an IQ score above 145?

• 0.13%

• 2.27%

• 50%

• 68.26%

A psychologist looking at a graph of IQ scores around the world notices that the data form a normal distribution. Which of the following statements describes the mean, median, and mode of a test whose scores are normally distributed?

• The mean and the median will be the same value, but the mode will be lower.

• The mean will be the highest value, followed by the median, followed by the mode.

• The mode will be the highest value, followed by the median, followed by the mean.

• The mean, the median, and the mode will be the same value.