<span>"Have you ever received a speeding ticket? ______ yes ______ no," when followed by a question such as: "when did you receive that ticket?"</span> is called a Contingency or Filter question.
In social research, this types of questions enables the researcher determine whether the respondent is qualified or has enough experience to answer the next or preceding questions.
Answer:
The St. Lawrence Seaway connects the Atlantic Ocean with the Great Lakes.
Explanation:
St. Lawrence Sea is a long waterway near the Northeastern border of America that connects from the Atlantic Ocean into the Great Lakes. It has allowed for shipping vessels to come through. However, these ships sometimes bring invasive species such as the Sea Lamprey.
In 1750 the price of a cotton shirt was much higher because there was less efficient technology.
Answer:
1. Co-variance= -1.2
2. correlation coefficient= -0.4404
3. There is weak negative relationship between x and y.
Explanation:
1.
Co-variance= Cov(x,y)= sum[(x-xbar)(y-ybar)]/n
xbar=sumx/n=32/5=6.4
ybar=sumy/n=35/5=7
x 7 8 5 3 9
x-xbar 0.6 1.6 -1.4 -3.4 2.6
y 7 5 9 7 7
y-ybar 0 -2 2 0 0
(x-xbar)(y-ybar) 0 -3.2 -2.8 0 0
Cov(x,y)= sum[(x-xbar)(y-ybar)]/n=-6/5=-1.2
Cov(x,y)=-1.2
2.
correlation coefficient=r

x 7 8 5 3 9
x-xbar 0.6 1.6 -1.4 -3.4 2.6
y 7 5 9 7 7
y-ybar 0 -2 2 0 0
(x-xbar)(y-ybar) 0 -3.2 -2.8 0 0
(x-xbar)² 0.36 2.56 1.96 11.56 6.76
(y-ybar)² 0 4 4 0 0

r=-0.4404
3. Since the value of correlation coefficient is negative and less than 0.5 , so, we can say that there is weak negative relationship between x and y.