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Question: A random sample of 50 recent patient records at a clinic shows that the average billing per visit was $53.01 and the standard deviation was $16.48.
a. Find the 95% confidence interval for the mean and interpret it.
b. Find the 99% confidence interval.
c. Find the one-sided 95% confidence interval specifying at least some level of billing.
You read a report that says, "On the basis of the simple random sample of 100 high school seniors that took the SATM test this year, a confidence interval for µ is found to be 512.00 ± 25.76." What was the confidence level used to calculate this..
The company uses two cost driver rates for allocating manufacturing overhead costs to job orders: one on the basis of machine hours for allocating machining department overhead costs and the other on the basis of direct labor cost for allocating t..
Suppose you play a game at a casino where your probability of winning each game is 0.49. On each game, you bet $10, which you either win or lose.
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
Packets filled consecutively by the machine. Calculate the limits within which the weight of the packets should lie assuming that the machine is not been classified as faulty.
The cost of one serving of peanut butter ( in cents) for a random sample of 19 jars of peanut butter was found to be:
Commute times of teachers in a large urban area are normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes. If a commute time is randomly selected, find the probability that the commute time will be greater than 51 mi..
The average hourly wage of employees of a certain company is $10.87. Assume the variable is normally distributed. If the standard deviation is $4.31, find the probability that a randomly selected employee earns less than $9.36.
A city's telephone book lists 100,000 people. If the telephone book is the frame for a study, how large would the sample size be if systematic sampling.
When calculating all the values of a Poisson distribution, the work can often be simplified by first calculating p(0; λ) and then using the recursion formula
suppose that intrests rates offered for refinancing are normally distributed with a mean of 3.0 and standard deviation
Then of the 250 students in the school 30 did not attend. Do the new numbers show that the plan increased attendance?
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