Questions from Engineering Statistics

Q: Consider the data of Exercise 1.19 on page 31.

Consider the data of Exercise 1.19 on page 31. Construct a box-and-whisker plot. Comment. Compute the sample mean and sample standard deviation. Exercise 1.19 The following data represent the length...

Q: If S21 and S22 represent the variances of independent random samples of

If S21 and S22 represent the variances of independent random samples of size n1 = 25 and n2 = 31, taken from normal populations with variances σ21 = 10 and σ22 = 15, respectively, find P(S21/S22 > 1.2...

Q: Consider Example 1.5 on page 25. Comment on any

Consider Example 1.5 on page 25. Comment on any outliers.

Q: Consider the data in Exercise 9.13. Suppose the manufacturer

Consider the data in Exercise 9.13. Suppose the manufacturer of the shearing pins insists that the Rockwell hardness of the product be less than or equal to 44.0 only 5% of the time. What is your reac...

Q: Consider Review Exercise 8.56. Comment on any outliers in

Consider Review Exercise 8.56. Comment on any outliers in the data.

Q: The breaking strength X of a certain rivet used in a machine

The breaking strength X of a certain rivet used in a machine engine has a mean 5000 psi and standard deviation 400 psi. A random sample of 36 rivets is taken. Consider the distribution of ¯X, the samp...

Q: Consider the situation of Review Exercise 8.62. If the

Consider the situation of Review Exercise 8.62. If the population from which the sample was taken has population mean μ = 53, 000 kilometers, does the sample information here seem to sup...

Q: Two distinct solid fuel propellants, type A and type B,

Two distinct solid fuel propellants, type A and type B, are being considered for a space program activity. Burning rates of the propellant are crucial. Random samples of 20 specimens of the two propel...

Q: A random sample of employees from a local manufacturing plant pledged the

A random sample of employees from a local manufacturing plant pledged the following donations, in dollars, to the United Fund: 100, 40, 75, 15, 20, 100, 75, 50, 30, 10, 55, 75, 25, 50, 90, 80, 15, 25,...

Q: From the information in Review Exercise 8.70, compute (

From the information in Review Exercise 8.70, compute (assuming μB = 65%) P(¯XB ≥ 70).