Answer:
B
Step-by-step explanation:
We have
Here the value of a is always positive because distance is positive
Next, we factor out 7 to get our period
So our period is
Next, our phase shift we set the inner parenthesis equal to 0.
So our phase shift is -3/7
Answer:
Third option,
Step-by-step explanation:
By observation, we can infer that
.
Subtract 8 from both sides:
Subtract 4x from both sides:
Divide both sides by -1:
Answer:
Step-by-step explanation:
Given that n =30, x bar = 375 and sigma = 81
Normal distribution is assumed and population std dev is known
Hence z critical values can be used.
For 95% Z critical=1.96
Margin of error =
Confidence interval = 375±29
=(346,404)
B) 99% confidence
Margin of error = 2.59*Std error =38
Confidence interval = 375±38
=(337, 413)
C) For 90%
Margin of error = 20
Std error = 20/1.645 = 12.158
Sample size
Atleast 44 people should be sample size.