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Assume that you plan to use a significance level of alpha=0.05 to test the claim that p1=p2. Use the given sample sizes and numbers of successes to find the z test statistic for the hypothesis test.
Telephone calls enter a switchboard at a rate of 3 calls per minute. Assume that any given no more than one call will enter and the number of calls entering the switchboard at any time interval do n
A recent study of how Americans get to work revealed the following data:
A manufacturer of window frames knows from experince that 1 percent of the production will have some type of minor defect that will require an adjustment. What is the probability that in a sample of
A sample of 31 different payroll departments found that employees worked an average of 3103 day a year with a standarddeviation of 23.8 days. What is the 90% confidence intervsl for the average days
The point estimate for a processor that world correctly for at least 1000 hours based on a sample size of 100 is .91. Find a 95% confidence interval on the point estimate.
A survey of 61,647 people included questions about office relationships. Of the respondents, 26% reported that their bosses scream at employees. Suppose you want to test the claim that more than 1/4
An aircraft has 211 seats. when someone buys a ticket for a flight, there is a .0741 probability that the person will not show up for the flight. A ticket agent accepts 233 reservations for a flight
Suppose we randomly select a sample of 64 measurements from a larger population having a mean equal to 20 and a standard deviation of 4 .
Find the area under the normal curve to the left of z= -1.57 plus the area under the normal curve to the right of z= 2.57 The combined area is (Round to four decimal places as needed)
Determine the total area under the standard normal curve in parts (a) through (c) below. (a) Find the area under the normal curve to the left of z= -1 plus the area under the normal curve to the rig
The shape of the distribution of the time required to get an oil change at a 10 minute oil change facility is unknown. However, records indicate that the mean time is 11.2 minutes and the standard d
Nurses wondered if birth weights of babies are going up. They knew what the average birth weight of a baby last year was 7.6 pound. A random sample of 65 weights of babies at the hospital where the
A coach uses a new technique in training middle distance runners. The times for 8 different athletes to run 800 meters before and after this training are shown below (in seconds).
The data below represents the overall miles per gallon of 2008 SUV's priced under $30,000. Complete parts A & B 24 18 19 20 17 18 18 18 19 19 17 17 20 18 19 17 18 17 17 19 16 21 (A) Construct a
Describe a scenario where you believe a binomial distribution would be appropriate. Describe a scenario where you believe a geometric distribution would be appropriate. Explain your reasoning for bo
Liste below are the heights of fathers and sons. Find the value of r, and use a significance level of 5% to determine whether there is a significant linear correlation between the heights of fathers
Consider the following problem: A top NHL hockey player scores on 93% of his shots in a shooting competition. What is the probability that the player will not miss the goal until his 20th try?
What does R^2=.686 tell us about the variation about the regression line? What is an advantage of being able to determine the height of a tree from its circumfrence?
Describe a scenario where you believe a binomial distribution would be appropriate. Describe a scenario where you believe a geometric distribution would be appropriate.
Suppose that a tax increase is being proposed for a large city in order to support the public school system. Further suppose that 55% of the city's population is in favor of the tax, and 45% of the
An insurance company offers a policy for a $100,000 in the case of death during a calendar year for its young customers. The cost of the policy is $250. If a young customer does not survive a calend
Determine the average number of students in the queue and the average number of students in the system. Determine the average waiting time in the queue and the average total time in the system for a s
Use the sample data to construct an 80% confidence interval for the mean difference in confidence between the control group and the workshop conditions.
The U.S. Post Office is interested in estimating the mean weight of packages shipped using the overnight service. They plan to sample 300 packages. A pilot sample taken last year showed that the sta