A physicist wants to verify whether a radioactive substance has a level of radioactivity equal to 4 radioactive particles emitted per millisecond. He measures the radioactivity with a Geiger counter, and it records 18 particles in 3 msec.
a. What is the expected number of radioactive particles per 3 m sec?
b. Compute the P value for an observed value this far or even farther from the number expected in 3 msec.
c. Using an a of 0.05, make a test of hypothesis to determine if the radioactivity level is significantly greater than expected.