Arandom sample of 1001 americans aged 18-24 years showed that 51% believe their health is extremely important. the interval that is 95% certain to contain the proportion of all 18-24 year olds who believe that their health is extremely important is
a) between 48% and 54%.
b) between 50% and 52%.
c) between 46% and 56%.
d) between 41% and 61%.

A) between 48% and 54%

Step-by-step explanation:

given that a random sample of 1001 Americans aged 18-24 years showed that 51% believe their health is extremely important.

Here

Sample size n =1001

sample proportion p = 0.51

Standard error of proportion =

Since sample size is sufficiently large we can take Z critical value for confidence interval

Z critical value for 95% = 1.96

Margin of error = ±1.96*std error

= ±0.0310

confidence interval = 0.51 ±0.0310

= (0.48, 0.54)

i.e. A) between 48% and 54%

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b