2. A psychologist regularly runs rats through a maze and records the amount of time it takes them to finish. One hundred

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2 A Psychologist Regularly Runs Rats Through A Maze And Records The Amount Of Time It Takes Them To Finish One Hundred 1 (93.43 KiB) Viewed 57 times

2. A psychologist regularly runs rats through a maze and records the amount of time it takes them to finish. One hundred rats were run through a maze and they produced a sample mean of 25 seconds with a standard deviation of 2 seconds. (a) What can you say about the proportion of rats who took between 19 and 31 seconds to run through the maze assuming pothing about the shape of the distribution of times? Xa loo S=2 Mean: 95 1191-KS (0) 31 +ks 1925-2 K=3가들이을 유 (b) Between what two times will at least 75% of the rats complete the maze in assuming nothing about the shape of the distribution of times? Answer C91,99) (c) Assuming a mound-shaped and symmetric distribution, what can you say about the proportion of rats who took between 21 and 29 seconds? = 95% (d) Assuming a mound-shaped and symmetric distribution, what can you say about the proportion of rats who took more than 27 seconds? -swei 16%