In the probability statement PF75 Solution14 As df1 7 df2

Solution

14.

As df1 = 7, df2 = 5, and the left tailed area of Q is 0.05, then by table/technology,

Q = 0.252 [ANSWER, D]

********************

15.

Formulating the null and alternatuve hypotheses,          
          
Ho:   p   =   0.85
Ha:   p   =/=   0.85
As we see, the hypothesized po =   0.85      
Getting the point estimate of p, p^,          
          
p^ = x / n =    0.666666667      
          
Getting the standard error of p^, sp,          
          
sp = sqrt[po (1 - po)/n] =    0.053229065      
          
Getting the z statistic,          
          
z = (p^ - po)/sp =    -3.38      
          
As this is a    2   tailed test, then, getting the p value,  
          
p =    0.00057      
significance level =    0.05      

As P < 0.05, REJECT THE NULL HYPOTHESIS.      

Hence,

OPTION D: -3.38, YES [ANSWER, D]