A confidence interval might be most appropriate during the early stages of a research project when little is known about the population's parameters and the project's researchers might still be gauging the parameters.

A) 90%
B) 95%
C) 99%
D) 100%

A 90% confidence

Step-by-step explanation:

99% confidence interval often used in scientific or medical research when making a wrong conclusion about a population parameter is very costly

95% confidence level in the field of statistics and is seen far more than any other confidence level

While 90% confidence interval might be most appropriate during the early stages of a research project when little is known about the population's parameters 

gdp is the best phrase!

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.