Asample of 31 boxes of cereal has a sample standard deviation of 0.81 ounces. construct a 93% confidence interval to estimate the true standard deviation of the fllins process for the boxes of cereal. a (0433, 1.120) b)(0.658,1.058) c (0.525, 1095) d (0.731,0.731) e) none of the above.

 Option 'b' is correct.

Step-by-step explanation:

Since we have given that

s = 0.81

n = 31

We need to find the 93% confidence interval to estimate the true standard deviation.

degrees of freedom = df = n-1=30

Here, α = 0.93

1-α=0.07

so,

and

So, we will use "Chi square distribution"

So, the interval would be

Hence, 93% confidence interval would be (0.6581,1.058).

Therefore, Option 'b' is correct.

step-by-step explanation:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.