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STAT 200 Week 4 Homework Problems

6.1.2

1.)

The commuter trains on the Red Line for the Regional Transit Authority (RTA) in Cleveland, OH,

have a waiting time during peak rush hour periods of eight minutes ("2012 annual report,"

2012).

a.) State the random variable. Waiting time for the red line of the RTA in Cleveland in minutes.

b.) Find the height of this uniform distribution. height = 0.1

c.) Find the probability of waiting between four and five minutes. P(4 241) = 1- P(z < -1.12) = 1-0.1335= 0.8665

g.) Compare your answers in part c and f. Why is one smaller than the other?

Increasing the sample size decreases the rate of error in the sample, yielding different

results. As error value gets smaller, we divide by a smaller number, making the absolute

value of the zscore.

6.5.4

According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with

a standard deviation of 23 mmHg (Kuulasmaa, Hense & Tolonen, 19...