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Question 1

Which of the following events is the most probable?

Answer 1

flipping 6 or more heads in 10 coin flips

Question 2

When a mean is reported on a TV news broadcast, it is most important for readers to…

Answer 2

consider whether it is distorted by a few extreme cases.

Question 3

Seven members of a Girl Scout troop report the following individual earnings from their sale of candy: $4, $1, $7, $6, $8, $2, and $7. In this distribution of individual earnings…

Answer 3

the mean is less than the mode and equal to the median.

Question 4

Approximately what percentage of the cases represented by the normal curve fall between –1 and +1 standard deviations from the mean?

Answer 4

68

Question 5

The difference between the highest and lowest scores in a distribution is the…

Answer 5

range.

Question 6

Once researchers have gathered their data, they may organize that data using…

Answer 6

descriptive statistics.

Question 7

The symmetrical bell-shaped figure used to represent the distribution of many physical and psychological characteristics is called a…

Answer 7

normal curve.

Question 8

If IQ scores are normally distributed, having a mean of 100 and a standard deviation of 15, approximately what percentage of people have IQ scores somewhere between 70 and 130?

Answer 8

95

Question 9

Mr. and Mrs. Pollak have six children ages 6, 8, 8, 10, 12, and 16. The mean age of the Pollak children is…

Answer 9

10.

Question 10

Approximately what percentage of the cases represented by the normal curve fall between 3 and +3 standard deviations from the mean?

Answer 10

100

Question 11

It’s easy to design a ________ to make small differences among groups look large by limiting the range of the y-axis.

Answer 11

bar graph

Question 12

Which measure of central tendency is more reliable when the data come from scores with low variability?

Answer 12

mean

Question 13

All statistical tests begin with the assumption that no difference exists between groups. This is called..

Answer 13

the null hypothesis.

Question 14

Seven members of a boys’ club reported the following individual earnings from their sale of cookies: $2, $9, $8, $10, $4, $9, and $7. In this distribution of individual earnings…

Answer 14

the median is greater than the mean and less than the mode.

Question 15

Which measure of variation is affected most by a few extreme scores?

Answer 15

Range.