Assume that a researcher wants to estimate the proportion of "A" grade scorers in
STAT101 course for the population of SEU
students in 2020. Assume also that the
proportion of "A" grade scorers in 2020 is not
known. How many SEU students must be
surveyed from STAT101 course in order to be
90% confident and the margin of error should
not exceed two percentage points? (Given za/ 2 = 1.64).

1-1821
2-1781
3- 1618
4-1681

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).

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: