Ch. 5 Homework (13 problems)
1.
a) Continuous random variable
b) Continuous random variable
c) Not a random variable
d) Continuous random variable
e) Continuous random variable
f) Continuous random variable
a) Discrete random variable
b) Continuous random
1. The value given below is discrete. Use the continuity correction and describe the region of the normal
distribution that corresponds to the indicated probability.
Probability of exactly 3 passengers who do not show up for a flight is
The area between 2
1. A margin of error of 100 points seems too high to provide a good estimate of the mean score
Z alpha/2=1.96
2. Find the critical value z Subscript alpha divided by 2 z/2 that corresponds to alpha=0.20
Z alpha/2= 1-0.20/2 =0.9
Z 0.1=1.28
3.
4. Use the sa
Ch.6.2 & 6.3 HW
1. Find the indicated z score. The graph depicts the standard normal distribution with mean 0 and standard
deviation 1.
The indicated z score is 2.16
2. Assume that a randomly selected subject is given a bone density test. Those test score
1. Using the simple random sample of weights of women from a data set, we obtain these
sample statistics: n=40 and x overbar=145.02 lb. Research from other sources suggests
that the population of weights of women has a standard deviation given by =30.08 l