Aresearcher interested in language development obtains a sample of 25 three-year-old girls and a sample of 25 three-year-old boys. each child is given a vocabulary test and the researcher computes the mean score for each sample. the difference between the two sample means is an example of a
a. statistic
b. variable
c. constant
d. parameter

(a) statistic

Step-by-step explanation:

The researcher conducted the research using sample space of 25 three-year-old girls and 25 three-year-old boys. This sample space is subjected to test with an expected outcome. The test allows the research to perform analysis on the event base on data he has collected. The collection, analysis and interpretation of data is called statistics.

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3

on a coordinate grid, point a is at (−4.0, −2.4) and point b is at (4.0, −2.4). point b is a reflection of point a across the –axis. input either a lowercase x or i think is the right awnser

step-by-step explanation: