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A regional director responsible for business development in the state of pennsylvania is concerned about the number of small business failures. If the mean number of small business failures per month is 10, what is the probability that exactly four small businesses will fail during a given month? Assume that the probability of a failure is the same for any two months and that the occurrence or nonoccurrence of a failure in any month is independent of failures in any other month.
The ages of circulating pennies are right skewed. Most circulating pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulating pennies have a mean of 12.2 years and a standard deviation of 9.9 years.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
Determine the point estimate and 95% confidence interval for the mean family dental expenses of all employees of the company.
At the 0.05 level of significance, using the critical value approach, is there evidence to suggest that the new mathematical model has improved process performance?
What is the probability that a randomly selected monthly cell phone bill is more than $100?
Draw the scatter diagram. Does it appear that x and y are related? If so, how? Test to determine whether there is evidence of a linear relationship
Neither subjects nor researcher knew who was assigned to what. Determine three terms explain the experimental design?
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Given length an athlete throws a hammer is a normal random variable with mean 50 feet and standard deviation five feet, what is the probability he throws it: Between 50 feet and 60 feet.
What is the 25th percentile of a X² distribution with 20 degrees of freedom? What symbol is used to denote this value?
If you select a random sample of 100 voters, what is the probability that a candidate will be forecast as the winner when. The true percentage of her vote is 50.1%?
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