Answer:
P ( z ) = 0.005
Step-by-step explanation:
From problem statement:
We know:
Researchers study 45 % adults over 65 suffering disorders
Sample 320 out of 750
then p = 320 / 750 = 0,4267
1.- Test hypothesis
H₀ null hypothesis ⇒ p₀ = 0,45
Hₐ alternative hypothesis ⇒ p₀ < 0.45
We calculate the z(s) as:
z(s) = ( p - p₀ )/ √ p₀*q₀/n ⇒ z(s) = ( 0.4267 - 0.45 )/ √(0.45*0,55)/750 z(s) = - 0.0233* √750 / 0.2475
z(s) = - 0.6381/0.2475 ⇒ z(s) = - 2.57
We look for - 2.57 in z tabl to find the probability of fewer than 320 out of 750 suffer of disorder, and find
P ( z ) = 0.0051
P ( z ) = 0.005
Answer:
Step-by-step explanation:
Answer:
a)64
b)96
Step-by-step explanation:
For this we calculate the number of rows, 32, as 2+3 is 5, and 160/5 is 32. Then we know that there are 32 rows, and in each row are 2 left seats and 3 right seats, so we multiply 32 by both numbers for the answers.
Answer:
434
Step-by-step explanation:
310 times .4 (percentage) = 124 which is how much she gained, then you add that onto the original amount to find how many she has now, which is 434