Mercedes is conducting a study about the costs of prom dresses. her school has 2500 students. she asks 10 of the girls in her ap statistics class to participate in a survey. she bases her findings on these results. is this a valid study? why or why not?
a) no, she should ask the girls in her chorus class instead
b) yes, asking 10 girls in her class will give her a good sample to work with.
c) yes, drawing a sample only from ap statistics gives a random sample of girls attending prom at the school.
d) no, drawing a sample only from ap statistics does not give a random sample of girls attending prom at the school.

D) NO, drawing a sample only from AP statistics does not give a random sample of girls attending prom at the school.

Step-by-step explanation:

Given: Mercedes is conducting a study about the costs of prom dresses.

The total students in her school = 2500

She asks 10 of the girls in her AP statistics class to participate in a survey.

Since 10 is a too smaller number than 2500 which means sample taken by her for survey is very small and it can be biased.

Therefore, D is the right answer .

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.

the answer will be