BUS 201 EXAM 1 QUESTIONS WITH ACCURATE
ANSWERS
1. decide # of classes using "2 to the k" so 2^k is greater than n
- n is the number of values in data set
2. determine class interval (i > (H-L)/k), round up to most convenient whole
number
3. set class limits (use min for lower limit, don't stop at max-finish interval)
4. add frequencies for each class to table correct answer steps to make a
frequency distribution table
1. Location= (n + 1)(M) (M- decimal of that percentile/decile/quartile)
2. Subtract= 2 #s from location found
3. Multiply= # from step 2 X decimal from step 1
4. Add= # from step 3 + smaller # from step 2 correct answer how to find
percentile, quartile, deciles
1. prohibitive cost of census
2. destruction of item being studied may be required
3. not possible to test or inspect all members of a population being studied
correct answer why take a sample instead of studying the whole population?
arithmetic mean correct answer requires interval scale, all vales used, is unique,
most effected by an outlier
-calculated by summing the values and dividing by #of values
arithmetic mean for grouped data correct answer M= midpoint of each class
, arithmetic mean, median, mode correct answer what are the measures of
location
bar chart correct answer A graph that shows qualitative classes on the horizontal
axis and the class frequencies on the vertical axis. The class frequencies are
proportional to the heights of the bars.
-bars don't touch, need labels/scales, bars same width
box plot correct answer A graph that displays the highest and lowest quarters of
data as whiskers, the middle two quarters of the data as a box, and the median
-vertical lines same length, can't touch x-axis, vertical line longer= skewed that
way
by column totals correct answer when comparing #s in a row, divide _____
by row totals correct answer when comparing #s in a column, divide _____
Chebyshev's Theorem correct answer k= the amount of standard deviations
class frequency correct answer the number of observations in each class
Class Interval correct answer obtained by subtracting the lower limit of a class
from the lower limit of the next class then divided by k
ANSWERS
1. decide # of classes using "2 to the k" so 2^k is greater than n
- n is the number of values in data set
2. determine class interval (i > (H-L)/k), round up to most convenient whole
number
3. set class limits (use min for lower limit, don't stop at max-finish interval)
4. add frequencies for each class to table correct answer steps to make a
frequency distribution table
1. Location= (n + 1)(M) (M- decimal of that percentile/decile/quartile)
2. Subtract= 2 #s from location found
3. Multiply= # from step 2 X decimal from step 1
4. Add= # from step 3 + smaller # from step 2 correct answer how to find
percentile, quartile, deciles
1. prohibitive cost of census
2. destruction of item being studied may be required
3. not possible to test or inspect all members of a population being studied
correct answer why take a sample instead of studying the whole population?
arithmetic mean correct answer requires interval scale, all vales used, is unique,
most effected by an outlier
-calculated by summing the values and dividing by #of values
arithmetic mean for grouped data correct answer M= midpoint of each class
, arithmetic mean, median, mode correct answer what are the measures of
location
bar chart correct answer A graph that shows qualitative classes on the horizontal
axis and the class frequencies on the vertical axis. The class frequencies are
proportional to the heights of the bars.
-bars don't touch, need labels/scales, bars same width
box plot correct answer A graph that displays the highest and lowest quarters of
data as whiskers, the middle two quarters of the data as a box, and the median
-vertical lines same length, can't touch x-axis, vertical line longer= skewed that
way
by column totals correct answer when comparing #s in a row, divide _____
by row totals correct answer when comparing #s in a column, divide _____
Chebyshev's Theorem correct answer k= the amount of standard deviations
class frequency correct answer the number of observations in each class
Class Interval correct answer obtained by subtracting the lower limit of a class
from the lower limit of the next class then divided by k
