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Of the bolts manufactured for a certain application, 90% meet the length specification and can be used immediately, 6% are too long and can be used after being cut, and 4% are too short and must be scrapped.
a. What is the probability that a randomly selected bolt can be used?b. What is the probability that fewer than 9 out of 10 bolts can be used?c. What is the probability that exactly 9 out of 10 bolts can be used immediately?
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
The population are shorter than 66 inches, what is the probability a randomly selected member of this population is between 66 and 76 inches tall?
For a sample of 36 students in a class the mean score in Mathematics is 72 with a standard deviation of 7. Find the 95% confidence interval for the mean score.
A nationwide standardized test taken by high school juniors and seniors may or may not measure academic potential, but we can nonetheless examine the relationship bewteen scores on such test and performance in college.
A number of minor automobile accidents occur at various high-risk intersections. A study was done. Eight intersections were chosen at random. The number of minor accidents during a 6-month period before and after the modifications were:
One of the major measures of the quality of service provided by any organization is the speed with which responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a major ..
At a certain college, there were 700 science majors, 100 engineering majors, and 500 business majors. If one student was selected at random, the probability that they are an engineering major is?
Perform all pairwise comparisons among the three programs, using a Tukey adjustment and an overall significance level of 0.05, then interpret all your results.
Find the mean and standard deviation for the numbers of boys in groups of 51. b) Is the result of 39 boys unusual? Does it suggest that the gender-selection method appears to be effective?
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
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