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Determine the test statistic. Determine the P-value for this test. Is there sufficient evidence to justify the rejection of H0 at the significant level of 0.01?
In 2003-2011 there are on average 75 days of rain per year. Assume that a year has 365 days, ignore leap years, and that a rainy day occurs randomly and is independent. What is the probability of ha
A researcher wanted to determine if the average waiting time at the emergency room in a local hospital is greater than 60 minutes. He randomly selected 15 patients at the emergency room facility and
In a large LB department store the average waiting time at the toys checkout counter is 5 minutes with a standard deviation of 2 minutes. Assume that the distribution of waiting time is normal.
The manufacturing of a layered material requires three steps which each require a certain amount of time. These steps can be assumed to be independent and the time for completion normally distribute
A recent survey compared the monthly incomes of electrical engineers with that of civil engineers. A sample of 13 electrical engineers had an average income of 64K with a sample standard deviation o
Which is typically larger, P(AxB) or P(A) x P(B)? Give an example of sets A and B for which these are the same size.
From a large class, a sample of 4 grades were drawn: 64, 66, 78, and 87. from a second large class, an independent sample of 3 grades were drawn: 59, 78, and 93. test if the two class have equivalen
The IRS was interested in the number of individual tax forms prepared by small accounting firms. The IRS randomly sampled 52 public accounting firms with 10 or fewer employees in the Dallas-Fort Wor
For a 5-acre wheat field the average number of field mice is 12. 1. Find the probability that more than 2 field mice are in a randomly selected acre? 2. Determine how many acres need to be scanned s
The capacity of an elevator is 10 people or 1630 pounds. The capacity will be exceeded if 10 people have weights with a mean greater than 1630/10=163 pounds.
In a town there are on average 2.4 children in a family and a randomly chosen child has on averate 1.55 siblings. Determine the variance of the number of children in a randomly chosen family.
A certain adjustment to a machine will change the length of the parts it makes but will not affect the standard deviation. The length of the parts is normally distributed, and the standard deviation
A sample of 20 of 171 funded projects revealed that 11 were valued at $18,000 each and 9 were valued at $20,200 each. From the sample data, estimate the total value of the funding for all the projec
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
A study in which researchers want to test whether nurses who work 8-hour shifts deliver higher-quality work than those who work 12-hour shifts. c. A study in which researchers want to determine whet
Calculate the expected value and the variance of X. Calculate P(X>0.5) and P(0.2<X<0.5)
Translate the statement into a confidence interval for p. Approximate the level of confidence. In a survey of 1000 U.S. adults, 19% are concerned that their taxes will be audited by the Internal Rev
Same question that I have asked earlier but need to derive the objective function and constraints and solved using Management Scientist Software.
Perform a hypothesis test to see if there is significant evidence to conclude that there is an interaction between the grow-light and the plant food used? Perform a hypothesis test to see if there i
Suppose that a data set has a minimum value of 24 and a maximun of 79 and that you want 5 classes. Explain how to find the class width for this frequency table. What happens if you mistakenly use a
When using the normal approximation to the binomial, what is the standard deviation for a binomial probability distribution with p =.3 and n = 145?
Wayne Collier designed an experiment to measure the fuel efficiency of his family car under different tire pressures. For each run, he set the tire pressure and then measured the miles he drove on a
Heights for college women are normally distributed with mean = 65 inches and standard deviation = 2.7 inches. Find the proportion of college women whose heights fall into the following ranges:
What is the probability that a randomly selected student spends more than $240 on textbooks this semester? What is the probability that a randomly selected student spends between $240 and $450 on text