Two business major students, in different sections of an economics class, were
comparing test scores. The following shows the sections’ mean and standard deviation.
The student in section 1 scored 84. The student’s z score would be _________.
About ______% of the area under the normal curve is within plus two and minus two
standard deviations of the mean.
If the Laspeyres index is 135.41 and the Paasche index is 145.34, what is Fisher’s ideal
index?
Product sales since 2001 are:
The least squares trend equation is given as:
Ŷ = 100 + 28t, where t is set equal to 1 for 2001.
What were the predicted sales for 2009?
A random sample of 20 female executives from companies with assets over $1 million
was selected and asked for their annual income and level of education. The ANOVA
comparing the average income among three levels of education rejected the null
hypothesis. The mean square error (MSE) was 250. The following table summarized the
results:
To compare the mean annual incomes of female executives with an undergraduate
degree and female executives with a high school or less education, compute the 95%
confidence interval.
The major advantage of ordinal data over nominal data is that it allows for
_________________.