zeesharpe05
23.07.2019 •
Mathematics
Standard normal curve between z=.42 and z=1.92 a= .6902 b= .3098 c= .1902 d= .8098
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Ответ:
To find the answer, you have to use a normal distribution table. Look up the percents for each z-score and subtract them to find the region between.
z = 1.92 the percent is 0.9726
z = 0.42 the percent is 0.6628
0.9726 - 0.6628 = 0.3098
Ответ:
D
Step-by-step explanation:
A middle school conducted an experiment to show how an advanced teaching method that was different from what was currently employed could improve the academic performances of 8th grade students. Students were informed of the experiment in an assembly. The researchers then randomly selected 15% of all the 8th grade students to form special classes. Students in the special classes were taught using the new approach, while other students remained in their original classes and were taught using the same way as before. General conditions such as class sizes were similar among all classes. After one semester, the changes in academic performances were recorded.