Introduction Quiz (Ch 1)

The shape of the distribution is best described as

• Negatively skewed

• Approximately symmetric

• Negatively skewed with a possible outlier

• Positively skewed with a possible outlier

• Approximately symmetric with a possible outlier

The percentage of the 46 possums with a skull width of less than 55 mm is closest to

• 12%

• 26%

• 39%

• 61%

• 74%

The third quartile (Q3) for this distribution, in millimetres, could be

• 55.8

• 56.2

• 56.9

• 57.7

• 58.3

The mean and the standard deviation of age for this sample of possums are closest to

• mean = 4.25 standard deviation = 2.6

• mean = 4.8 standard deviation = 2.4

• mean = 4.8 standard deviation = 2.5

• mean = 4.9 standard deviation = 2.4

• mean = 4.9 standard deviation = 2.5

The variables age (under 55 years, 55 years and over) and preferred travel destination (domestic, international) are

• both categorical variables.

• both numerical variables.

• a numerical variable and a categorical variable respectively.

• a categorical variable and a numerical variable respectively

• a discrete variable and a continuous variable respectively.

The data displayed in the percentaged segmented bar chart supports the contention that there is an association between preferred travel destination and age because

• more visitors favour international travel.

• 35% of visitors under 55 years favour international travel.

• 45% of visitors 55 years and over favour domestic travel.

• 65% of visitors under 55 years favour domestic travel while 45% of visitors 55 years and over favour domestic travel.

• the percentage of visitors who prefer domestic travel is greater than the percentage of visitors who prefer international travel.

The results could also be summarised in a two-way frequency table. Which one of the following frequency tables could match the percentaged segmented bar chart?

• 
• 
• 
• 
• 

Based on the boxplots above, it can be said that

• 50% of the fish caught in Pond A are the same length as the fish caught in Pond B

• 50% of the fish caught in Pond B are longer than all of the fish caught in Pond A

• 50% of the fish caught in Pond B are shorter than all of the fish caught in Pond A

• 75% of the fish caught in Pond A are shorter than all of the fish caught in Pond B

• 75% of the fish caught in Pond B are longer than all of the fish caught in Pond A

A player with a height of 179 cm is considered an outlier because 179 cm is greater than

• 162 cm

• 169 cm

• 172.5 cm

• 173 cm

• 175.5 cm

The variables test grade (A, B, C, D, E) and instructional method (individual, group) are

• a numerical and a categorical variable respectively

• both nominal variables.

• a nominal and an ordinal variable respectively.

• both ordinal variables.

• an ordinal and a nominal variable respectively