# In a normal distribution, what z-score separates the highest 25% of the scores from the rest of the distribution?

QUESTION 9
Match the variable to its variable type. Answer items can be used more than once.

Variable:
_Number of premature babies born at Royal Brisbane Hospital
_Weights of babies (in grams) born at Royal Brisbane Hospital during a year
_Range of motion of elbow joint (none, limited, full) of students enrolled in a university
_Under-arm temperature (degrees C) of day-old infants born in a hospital
_Number of cigarettes smoked in a week (none, 1-4, 5-10, 11+)
_Country of origin (Australia, other English-speaking country, non-English speaking country)

Variable type:
a) nominal
b) continuous
c) qualitative
d) ordinal
e) discrete
QUESTION 10
In the US, one question that the General Social Survey asks is whether you agree or disagree with the following statement: “It is more important for a wife to help a husband’s career that to have one herself”. In 2010, 396 out of 1907 respondents agreed. Calculate the best estimate of the proportion of respondents who agreed with the question, reporting your answer to two decimal places so that the number looks like X.XX :
QUESTION 11
For the question about a wife’s career above, a 90% confidence interval is:

a) (0.189, 0.226)
b) (0.196, 0.220)
c) (0.192, 0.223)
d) (0.184, 0.232)
QUESTION 12
In a normal distribution, what z-score separates the highest 25% of the scores from the rest of the distribution?

a) z = 0.25
b) z = 2.05
c) z = +0.67
d) z = -0.67