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A plastic has a mean breaking strength 27 and a standard deviation of 6 pounds per square inch. A new process is developed and will replace the old one, provided that there is substantial evidence that it improves the strength of the product. A random sample of 40 pieces made with the new process gives a sample mean of 30 pounds per square inch.
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
At 0.05 level of significance, is there evidence that proportion of claims processed under this new system is higher than article reported for previous system?
Utilizing Excel data analysis calculate t distribution also deduce the result. Study of variance is used to investigate if there is a difference in the mean mileage of the three cars.
If the voice identifications were made by random guess, find the probability that all 9 victims would select the same person?
Determine the mean number of times the machine was used per day.
Make up a scatter diagram with 10 dots for each of the following situations:
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Are number of toilet breaks and amount of beverage consumed related? Describe how? Provide the value of statistic and probability value.
A local group claims that the police issue more than 60 speeding tickets a day in their area.
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
A test was conducted to find out whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at trade show employing a female spokesperson determined that 70 out of 150 customers prefe..
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
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