Suppose you perform a study about the hours of sleep that college students get. you know that for all people, the average is about 7 hours. you randomly select 40 college students and survey them on their sleep habits. from this sample, the mean number of hours of sleep is found to be 6.2 hours with a standard deviation of 0.86 hours. you want to construct a 99% confidence interval for the mean nightly hours of sleep for all college students.

(a) what is the point estimate for the mean nightly hours of sleep for all college students?
hours

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2

8

step-by-step explanation:

the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

the root or roots of a polynomial are the values of the variable that makes the polynomial equal to 0. we can find the roots of a polynomial making the expression equal to 0 and then, isolating the variable (it it has just one variable).

for example, given the following polynomial:

the root or zero of the polynomial, can be found by making the expression equal to 0, and then, isolating the variable, so, finding the root we have:

therefore, we have that the root of the polynomial is equal to 2.

we must remember that the number of roots that a polynomial can have, will depend on the degree of the polynomial, a first degree polynomial have will have one single root, a second degree polynomial (quadratic expression) may have two roots and so.

hence the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

have a nice day!