In a study of the effect of diet on cholesterol, rats were fed several different diets. one diet had 5% added fiber from oat bran. the study report gives results in the form "mean plus or minus the standard error of the mean." this form is very common in scientific publications. for the 9 rats fed this diet, blood cholesterol levels (in milligrams per deciliter of blood) were 89.02 ± 5.26. what are x and s for these 9 rats? (use 2 decimal places.)

x = 89.02 milligrams

s = 15.78 milligrams

Step-by-step explanation:

Data provided:

Mean plus or minus the standard error of the mean = 89.02 ± 5.26

Sample size, n = 9 rats

Now,

x is the mean of the sample of 9 rats i.e 89.02 milligrams (as given in the question)

and,

s is the standard deviation

The standard deviation can be calculated using the relation:

Standard error =

on substituting the respective values, we get

5.26 =  

or

Standard deviation = 5.26 × 3

or

Standard deviation = 15.78 milligrams

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have