12 General Unit 3 Topic 1 part 1 2020

The variables plays sport and sex are:

• both categorical data

• a categorical and a numerical variable respectively

• both numerical variables

• a numerical and a categorical variable respectively

• neither numerical nor categorical variables

The number of females who do not play sport is:

• 21

• 45

• 79

• 96

• 175

The percentage of males who do not play sport is:

• 19.4%

• 33.3%

• 34.0%

• 66.7%

• 68.0%

The variables plays sport and sex appear to be associated because:

• more females play sport than males

• fewer males play sport than females

• a higher percentage of females play sport compared to males

• a higher percentage of males play sport compared to females

• both males and females play a lot of sport

The percentage of students who think it is important to obey rules and who find life dull is closest to:

• 14%

• 58%

• 7%

• 12%

• 51%

From this table, we can conclude there is a relationship between how exciting respondents find their lives and how important they think it is to obey rules because:

• many more students find life to be very exciting than routine or dull

• the percentage of students who find life very exciting is highest for those who think it is not important to obey rules (42% compared to 28% for the other two categories)

• the percentage of students who think it is not important to obey rules is highest for those who think life is very exciting (42%), followed by 53% who think life is routine, and 5% who say life is dull

• the percentage of students who find life routine is 57%, which is higher than those who find it exciting (31%) or dull 12%

• there is no relationship evident in these data between these variables

The association between weight at age 21 (in kg) and weight at birth (in kg) is to be investigated. The variables weight at age 21 and weight at birth are:

• both categorical variables

• a categorical and a numerical variable, respectively

• a numerical and a categorical variable, respectively

• both numerical variables

• neither numerical nor categorical variables

The scatter-plot shows the weights of 12 women at birth and at the age of 21. The association is described as:

• weak, positive and linear

• weak, negative and linear

• moderate, positive and non-linear

• strong, positive and linear

• strong, positive and non-linear

The variables response time to a drug and drug dosage are linearly associated, with r = −0.9.

From this information, we can conclude that:

• response times are –0.9 times the drug dosage

• response times decrease with decreased drug dosage

• response times decrease with increased drug dosage

• response times increase with increased drug dosage

The birth weight and weight at age 21 of eight women are given in the table below.

The value of the correlation coefficient is closest to:

• 0.536

• 0.6182

• 0.7863

• 0.8232

• 0.8954