Answer: 
Step-by-step explanation:
The pool of rats from which the researcher is drawing participants is composed of the following:
23 male albino rats
21 male spotted rats
35 female albino rats
11 female spotted rats
Total rats = 23+21+35+11 =90
After drawing first rat , total rats remained = 89

The probability of choosing a male albino rat and then either a female albino rat or a male spotted rat = 
<u>(a) Construct a 95% confidence interval for the difference between the average number of intrusion attempts per day before and after the change of firewall setting (assume equal variance)</u>
Answer:
10+15
Step-by-step explanation:
Answer:
x=1
y=-1
Step-by-step explanation:
B. The chart shows that the more hours being put into playing computer games, the lower the test scores get.