The assumptions are the same for using T or Z in constructing a confidence interval for the population mean.
Ideally, a random sample is taken
• The population of measurements is normally distributed or a sample of at least
30 is taken.

When do we use a t distribution for estimating the population mean with a
confidence interval?

A. The confidence interval is less than 90%
B. The sample mean is very small.
C. The confidence level is close to 100%
D. The population standard deviation is unknown.
E. The sample mean is very large.

answer: the answer is simply nothing.

step-by-step explanation: because there is no ending to this question

gimme brainliest > : 3

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %

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