1.9 Data Analysis
One way that graphs can be misleading is to ...
Change the axes and not start at (0,0)
A linear scatter plot with dots going in an uphill manner would have a ___________ correlation
The mode of a data set is the ...
numbers that show up the most frequent number of times
The probability of getting a 4 on a regular die is ..
1/6
to use a student's t-distribution, you must do what first to the sample size before using the table
subtract 1 from n
Ex: If size of the proportion is 7, you must look up row 6 on the table
A magazine giving a survey and reporting about the responses is what type of sampling?
Voluntary
What is the point-slope form of a linear equation
y - y1 = m (x - x1)
a box and whisker plot is divided up into ___ parts, therefore the fractions are in _______
4 parts, into fourths
left whisker, left side of box, right side of box, right whisker
In order for a probability distribution to be valid, the probabilities must equal ....
ONE!
Using your table: Find a 95% confidence interval for a sample size of 4
3.182
A company that pulls every 10th item off their assembly line to inspect and check for quality control is doing what type of sampling?
Stratified or Systematic
To find the range of data, you must do what?
Subtract the smallest value from the largest value
To find an outlier, you must do what calculation
1.5 x IQR and see if the data is below Q1 - the value or above Q3 + the value
Pulled and NOT replaced
P(red, red) =
0.047 or 4.7%
Using your table: Find a 99.9% confidence interval for a sample size of 4
12.924
If a histogram is skewed right, describe what would be happening
The data would be higher on the left with a tail on the right side (lower bars on right)
Describe a scatterplot that has a negative correlation with an r = - 0.5
points are going in a downhill pattern, but not forming a line
A bag has 4 red, 6 blue, 4 yellow and 2 green
Pulled and NOT replaced
P(red, blue, green) =
0.014
6 students meeting in a classroom with 10 chairs
How many arrangements?
Combination
210
Using your table: Find a 98% confidence interval for a sample size of 7
3.143
How do you figure out what class the median of a histogram is located?
Look at how many data values there are, find the median and see which class it falls in
What is the point-slope form of an equation that passes through (0, -3) and has a slope of 3
y + 3 = 3 ( x - 0 )
or y + 3 = 3 x
A bag has 4 red, 6 blue, 4 yellow and 2 green
Pulled and NOT replaced
P(blue, red, NOT green) =
0.086 or 8.6%
C or P?
The top 3 finishers in a cross country race of 25 students
How many different ways could we students finish?
Permutation
13,800
Using your table: What is the difference between a 95% confidence interval for a sample size of 4 and a 95% confidence interval of n = 8
0.817