Step-by-step explanation: The true mean of a set of data is between an interval of values with a percentage of precision, e.g., a <u>99% confidence interval</u> means we are 99% confident the true mean is between the lower and upper limits.

To find the interval, use

x± $z\frac{s}{\sqrt{n}}$

z is z-score related to the % of confidence level

In this case, a 99% confidence interval is 2.576

x is sample mean

Calculating:

$x=\frac{63+69+62+66}{4}$

x = 65

65± $2.576\frac{3.16}{\sqrt{4}}$

65±4.07

Confidence Interval: 60.93 < μ < 69.07

Meaning that we are 99% sure the population means is between 60.93 and 69.07.

7 0

2 years ago

Is (3,10) a solution of the equation y=4x?

Alexxx [7]

Answer:

Step-by-step explanation:

(3, 10)

3 = x

10 = y

Substitute into equation

10 = 4(3)

10 = 12

No it isn't a solution as y doesn't = x

4 0

3 years ago