Select True or False ? True False 1. The upper limit of the 85% confidence inter
ID: 3063496 • Letter: S
Question
Select True or False
? True False 1. The upper limit of the 85% confidence interval for the population proportion pp, given that n=60n=60 and p =0.20p^=0.20 is 0.2740.274.
? True False 2. If a sample of size 30 is selected, the value AA for the probability P(AtA)=0.95P(AtA)=0.95 is 2.045.
? True False 3. If a sample has 15 observations and a 95% confidence estimate for is needed, the appropriate t-score is 1.753.
? True False 4. If a sample of size 20 is selected, the value of AA for the probability P(tA)=0.01P(tA)=0.01 is 2.528.
Explanation / Answer
1.
SE = sqrt{0.2*0.8/60} = 0.05163977794
upper limit = 0.20 + 1.43*0.05163977794 = 0.274
Thus True.
2. True,
Check the tr distribution table for the degree of freedom = 29. If problem, please comment.
3. It is false.
this t value corresponds to 90% confidence , actual value would be 2.145
4. True
t value corresponding to degree of freedom 19 is indeed 2.528
For all these questions you need to know how to check the t distribution table. Comment if you want a help there.