Which of the following is the correct test statistic to employ when conducting the hypothesis test on differences in population means when samples of size n1 and n2 both > 30 are randomly, independently drawn with known population variances?
a. F-statistic
b. Z-statistic CORRECT
c. Durbin-Watson statistic
d. T-statistic

d

Step-by-step explanation:

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: