18. A stroke victim should receive medical attention within 12 minutes. What pro
ID: 3321981 • Letter: 1
Question
18. A stroke victim should receive medical attention within 12 minutes. What proportion of emergency patients will get attention within 12 minutes? (A) 40% (B) 44% (C) 80% (1) 20% (E) 12.5% 19. A 96% eonfidenen interval for n population mean is constructed using Xa2, What is an appropriate value for Zx? (A)1.96CB) 1.75 (C) 1.64 (D) 2.05 () 1.28 Use this information for problems 20 nnd 21. The waiting times at a bank are normally distributed with a mean of 4 minutes and a standard deviation of 1.8 minutes 20. What is the approximate 45th percentile waiting time? (A) 3.8 min (B) 4.2 min (C) 45 min (D) 5.8 min () 2.2 min 21. Consider the following seatter plots with the indicated correlation coefficients. What is the relationship among r, rs, and ra? (A) r,«n«n (B) r.Explanation / Answer
20.
mean = 4 min
Std deviation = 1.8 min
Thus range is 4-1.8 to 4+1.8 = 2.2 to 6.8 min
45th percentile = (6.8-2.2)*45/100 + 2.2 = 4.27
Option B
21.
r1 and r3 are negative slope so r1 and r3 lies in (0,-1)
r2 is positive slope thus r2 lies in (0,1)
Thus, r2 > r1,r3
r1 and r3 almost have same slope but r3 is having less std deviation as scattering is less
Thus, r3>r1
Thus, r2>r3>r1 or r1<r3<r2
Option B
22.
The power of statistical test is
Option A
Probability of failing to reject H0 if H0 is true
If Power > .10 we assume H0 is true
23.
Total candies =12
Yellow candies = 5
a. P(selecting 3 yellow candies from 5 yellow candies) = 5c3
b. P(selecting 3 candies from total candies) = 12c3
P(selecting 3 yellow candies from total) = a/b
Option B
19.
96% confidence interval value for z for two tales test
Is finding Probability of (1-.96)/2 = .02 on both ends
That is .02(negative z) and .98 (positive z)
Values will be same with sign difference
Refer Z table approx value is 2.05 option D
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.