(number of columns - 1)(number of rows - 1)
B.
The sample size minus one
C.
The sample size plus one
Answer Key:A

Question 19 of 20
1.0/ 1.0 Points
The data presented in the table below resulted from an experiment in which seeds of 5 different types were
planted and the number of seeds that germinated within 5 weeks after planting was recorded for each seed
type.
At the .01 level of significance, is the proportion of seeds that germinate dependent on the seed type?
Seed Type
Observed Frequencies
Germinated
Failed to Germinate
1
31
7
2
57
33
3
87
60
4
52
44
5
10
19

Feedback:
We are running a Chi-Square Test for Independence. Copy and Paste the table into Excel. You are given
the Observed Counts in the table. We need to calculate the Expected Counts . First sum up the rows and
column. Then you need to find the probability of the row and then multiple it by the column total.
Germinated
Failed to Germinate
Sum
1
31
7
38
2
57
33
90
3
87
60
147
4
52
44
96
5
10
19
29
Sum
237
163
400
Germinated
Failed to Germinate

1
=237*(38/400)
=163*(38/400)
2
=237*(90/400)
=163*(90/400)
3
=237*(147/400)
=163*(147/400)
4
=237*(96/400)
=163*(96/400)
5
=237*(29/400)
=163*(29/400)
Now that we calculated the Expected Count we can use Excel to find the p-value. Use
=CHISQ.TEST(highlight actual counts, highlight expected counts) = 0.00205
p-value = 0.00205 < .01, Reject Ho. Yes, the proportion of seeds that germinate dependent on the seed
type.
Question 20 of 20
0.0/ 1.0 Points
Click to see additional instructions
Staples, a chain of large office supply stores, sells a line of desktop and laptop computers.
Company executives want to know whether the demands for these two types of computers are
dependent on one another. Each day's demand for each type of computers is categorized as Low,
Medium-Low, Medium-High, or High. The data shown in the table below is based on 205 days of
operation. Based on these data, can ? Test at the 5% level of significance.
desktops
low
med-low
med-high
high
low
4
15
14
3
36
laptops
med-low
6
18
18
23
65
med-high
13
17
10
17
57
high
7
15
15
10
47
30
65
57
53
205
What is the test value for this hypothesis test?

What is the critical value for this hypothesis test?

What is the conclusion for this hypothesis test? Choose one.
1. At the .05 level of significance, Staples can conclude that demands for these two types of computers are
independent.