Using a random sample from a population, Carys cannot decide if she wants to construct a 90 percent confidence interval for the population mean or a 95 percent confidence interval for the population mean. What is the difference between the two confidence intervals?The 90 percent confidence interval will not be as wide as the 95 percent confidence interval. The 90 percent confidence interval will be wider than the 95 percent confidence interval. The size of the sample determines which interval is wider. An unbiased sample determines which interval is wider. Which interval is wider will depend on whether a z-statistic or a t-statistic is used.

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step-by-step explanation:

true

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.

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