Announcements for 84 upcoming engineering conferences were randomly picked from the stack of ieee spectrum magazines. the mean length of the conferences was 3.94 days, with a standard deviation of 1.28 days. assume the underlying population is normal. _

a. in words, define the random variables x and x.
b. which distribution should you use for this problem explain your choice.
c. construct a 95% confidence interval for the population mean length of engineering conferences.
i. state the confidence interval.
ii. sketch the graph.
iii. calculate the error bound.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

hint: which coefficient is a multiple of 360°?

step-by-step explanation:

10+4√2 is the answer. i dont have the time to explain.

its d hope this