# Question

Out of 267 roller skates randomly selected for close examination, 5 were found to have a loose rivet, and 12 were not cleaned according to specifications.

a. Use the formula for computing an expected count. How many roller skates would you expect to have both problems if the problems are independent?

b. Find the estimated probability of a loose rivet, using the relative frequency.

c. Similarly, find the estimated probability of a cleaning problem.

d. Use the probability formula from Chapter 6 to find the estimated probability of a loose rivet and a cleaning problem, assuming they are independent, using your estimated probabilities from parts b and c.

e. Convert your probability from part d to an expected count by multiplying it by the sample size.

f. Compare your answers to parts a (from the expected count formula) and e (from the independence formula). Comment on why they both came out this way.

a. Use the formula for computing an expected count. How many roller skates would you expect to have both problems if the problems are independent?

b. Find the estimated probability of a loose rivet, using the relative frequency.

c. Similarly, find the estimated probability of a cleaning problem.

d. Use the probability formula from Chapter 6 to find the estimated probability of a loose rivet and a cleaning problem, assuming they are independent, using your estimated probabilities from parts b and c.

e. Convert your probability from part d to an expected count by multiplying it by the sample size.

f. Compare your answers to parts a (from the expected count formula) and e (from the independence formula). Comment on why they both came out this way.

## Answer to relevant Questions

Your firm is considering expansion to a nearby city. A survey of employees in that city, asked to respond to the question “Will business conditions in this area get better, stay the same, or get worse?” produced the data ...Do training levels A, B, and C have approximately the same number of employees, except for randomness? (To answer this, test whether the percentage of employees at each training level differs significantly from the ...Why should you monitor a process? Why not just inspect the results and throw away the defective ones? Find the center line and control limits for each of the following situations. a.* Percentage chart, sample size n = 300, = 0:0731. b. Percentage chart, sample size n = 450, = 0:1683. c.* Percentage chart, sample size n = ...A firm specializing in the processing of rebate certificates has tabulated the frequency of occurrence of various types of problems, as shown in Table 18.5.2. a. Arrange the problems in order from most to least frequent, and ...Post your question

0