Amedical researcher is interested in determining if there is a relationship between adults over 50 who walk regularly and low, moderate, and high blood pressure. a random sample of 236 adults over 50 is selected and the results are given below:

70.8, 27.1, 66.2, 20.8
find the expected frequency e2,2 to test the claim that walking and low, moderate, and high blood pressure are not related.

c. 66.2

Step-by-step explanation:

expected frequency=

Eij= row total in the ith row* column total in the jth column/ (Grand total of te frequency

Eij=137*114/(236)

Eij=15502/236

66.2 approximate

               lw     mod  high  

walker326822122  

non walker246921114  

5613743236Total

ly

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -