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Employ the table of standard normal probabilities (z table) to answer the following questions.
What is P(z > 0.5)?
What is P(-0.8 < z < 1.5)?
What is P(z < -1.2)?
What z-value leaves 95 % of the normal distribution to its right?
What z-value, and its negative, leaves 20 % of the normal distribution in each tail, for a total tail area of 40%?
A study was designed to compare variability of male and female diastolic blood pressure. The null hypothesis was that the population standard deviation were equal versus the alternative that they were not equal.
Develop a 90 percent confidence interval for the proportion opposing health care changes. (Round your answers to 4 decimal places.)
A manufacturer of dodge balls uses a machine to inflate its new balls to a pressure of 13.5 pounds (σ =0.1). When the machine is properly calibrated, the mean inflation pressure s 13.50 pounds, but uncontrollable factors can cause the pressure of ..
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
An automobile manufacturer has a new model that they claim gets 27 miles per gallon. A consumer testing agency chooses 50 of these cars and finds that the sample mean is 25 miles per gallon and the sample standard deviation (s) is 3 miles per gall..
CAPM and Expected return. If the risk-free rate is 6 percent and the expected rate of return on the market portfolio is 14 percent, is a security with a beta of 1.25 and an expected rate of return of 16 percent overpriced or under priced?
There is a statistical deception here. Explain what is deceptive about the bar graph.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
How many degrees of freedom should the researcher use in her t-test critical value assuming that the variances are equal?
For binomial distribution among given values for n as well as p state whereas or not it is suitable to use normal distribution as an approximation.
The shell thicknesses of the eggs produced by a large flock of hens follow approximately a normal distribution with mean equal to 0.38 mm and standard deviation equal to 0.03 mm. Find the 95th percentile of the thickness distribution.
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