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A simple random sample of 8 women basketball player's weights has a standard deviation of 7.5 lb. Find the test statistic, using a 0.05 significance level, to test a claim that the standard deviation of all weights of women basketball players is less than 9 lb.
a. 5.833
b. 10.080
c. 5.556
d. 4.861

C. 5.556

hoped this helps!

Step-by-step explanation:

b < c < a < d

Step-by-step explanation:

P.S - The exact question is -

Given - Suppose x is a real number with 0 < x < . Set a = sin( - x) ,                                    

             b = cos( + x) , c = sin( x - ) , d = cos(2 - x)

To find - Arrange the values of a, b, c, d in increasing order , and explain

              how you determined their order.

Proof -

Firstly draw a unit circle where you indicate the following

A = ( cos(x), sin(x) )

B = ( cos( - x) , sin ( - x) )

C = ( cos( + x), sin ( + x) )

D = ( cos (2 - x) , sin (2 - x) )

As we have given that 0 < x <

⇒sin (x) and cos(x) are positive and sin(x) < cos(x)

The figure is as follows :

Now

By seeing point B , we can say that

sin ( - x) = sin (x) = a

By seeing point C , we can say that

cos( + x) = -cos (x) = b

By seeing point C , we can say that

sin( x - ) = -sin(x) = c

By seeing point D , we can say that

cos(2 - x) = cos(x) = d

As sin(x) < cos(x) ⇒ a < d

   -sin(x) > -cos(x) ⇒ c > b ⇒ b< c

and as we know that -sin(x) < sin(x) ⇒ c < a

∴ we get

b < c < a < d