Answer:
Step-by-step explanation:
Given that a survey was conducted that asked 1004 people how many books they had read in the past year.
Results are:
x bar =12.5
s = 16.6
n = 1004
Std error of sample = 
Since population std dev is not known t critical value can be used for confidence interval.
df = 1004-1 =1003
t critical = 1.96
Margin of error 
Confidence interval lower bound 
Upper bound
Answer:
4 years
Step-by-step explanation:
Look for the year where the green bar is higher than the red bar.
Answer:
x = -5/2
Step-by-step explanation:
65 x6 = 390
80 x 3= 240
390+240 = 630