Asimple random sample is drawn from a normally distributed population, and when making a statistical inference about the population mean, the margin of error is found to be 5.9 at a 95% level of confidence. if the mean of the sample is 18.7, what is the 95% confidence interval for the population mean? a. 18.7 ± 5.9 b. 18.7 ± 9.7 c. 18.7 ± 11.6 d. 18.7 ± 15.2the answer is a

A.

Step-by-step explanation:

The margin of error represents the maximum expected difference between the true parameter and the estimated parameter. It is a way to represent what the uncertainty is with a certain statistic.

Mathematically, confidence interval is

Here, the mean is 18.7 and the margin of error is 5.9, so confidence interval will be,

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: