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Based on a sampel of 500 employment records, representatives form the united states department of labor find that the 95% confidence interval for the proportion of female workers in the U.S. labor f
Suppose that 67% of the employees of a company participate in the company's medical savings program. Let x be the number of employees who participate in the program in a random sample of 50 employee
From the output below, is it safe to assume that the sample data used to complete this test is from a normal distribution? Please explain your answer.
Let x be the number of trials required to obtain a success where p is the probability of success on each trial. The hypothesis Ho: p=.1 is to be tested against the alternative Ha: p=.3. The hypothes
A new manager, hired at a large warehouse, was told to reduce the 26% employee sick leave. The manager introduced a new incentive program for the company's employees with perfect attendance. The man
What is the confidence interval estimate of the mean of mercury in the population?
Test the claim that our outreach had an impact on the percentage of students saying they were likely to o into engineering , at a significant level of 0.05.
Based on a survey for women aged 18 to 24, systolic blood pressures (in mm Hg) are normally distributed with a mean of 114.8 and a standard deviation of 13.3.
The ages of circulating pennies are right skewed. In other words, most circulatin pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulatin pennies h
A study is made of residents in Phoenix and its suburbs concerning the proportion of residents who subscribe to Sporting News. A random sample of 87 urban residents showed that 11 subscribed, and a
If so, how is that possible when the sample mean is 50% higher than the null hypothesis mean? If not, what ishe doing wrong?
Assume that the heights of bookcases are normally distributed. A random sample of 16 bookcases in one company have a mean height of 67.5 inches and a standard deviation of 2.9 inches.
A specific automotive part that a service station stocks in its inventory has a 8% chance of being defective. Suppose many cars come into the filling station needing this part each week. What is the
If fX,Y (x, y) = k(y ? x) is a joint density function over the triangular region with vertices at (0,0), (0,1), and (1,1), then what is the value of the constant k?
From a random sample of 70 high school seniors, the mean and standard deviation of the verbal scores in the SAT are found to be 433 and 47, respectively. Find a 95% confidence interval for the mean
On this scale, a score of 10.5 would be average. Below are the results for Hunterdon Pinot Noir Santa Lucia Highlands, one of the less expensive wines. Use the Runs Test to test the hypothesis that
The shear strength of the bond between the two propellant types is an important characteristic. Results of testing 20 randomly selected motors are shown in the following table. Test the hypothesis t
The content of a particular constituent in two different brands of a drug, measured in milligrams, was found to be as shown below. Test the hypothesis that the mean contents of the two brands are eq
Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confindence level.
A study was done on the propagation of an ultrasonic stress wave through a substance. In particular, attenuation in fiber-glass-reinforced polyester composites was measured. A random sample is 2.6,
The drying time of a certain type of paint under specified test conditions is known to have mean value 75 minutes. Chemists have proposed a new additive designed to decrease average drying time.
Let µ1 and µ2 represent the mean heart rates we would observe for the entire population represented by the volunteers, if all members of this population did the workout using the low or
To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil for a 2-year period.
At a certain high school, a random sample of 50 student are chosen for a free 10-week SAT prep class They are given a pre-test before the course begins and a post-test after taking the course. The p
A simple random sample of size n=40 is drawn from a population. The sample mean is found to be x (with the line above it)= 120.8 and the sample standard deviation is found to be s=12.5 . Construct a