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A sample of 27 blue jellybeans with a mean weight of 0.8580 g was taken. Assume that the standard deviation is known to be 0.0565 g. Consider a hypohesis test that uses a 0.05 significance level to test the claim that the mean weight of all jellybeans is equal to 0.8575 g (the weight necessary so that bags of jellybeas have the weight pronted on the package). Assume the weight of jellybeans is normally distributed.
a.) what is the test statistic?
b.) What are the critical values?
c.) What is the final conclusion?
A CFR system with λ = 0.0004 has been operating for 1000 hr. What is the probability that it will fail in the next 100 hr? The next 1000 hr?
Provide an example of how an ANOVA could expand on the results of a t-test. In other words, think of an example (related to the field of psychology) in which you could use a t-test, and then note how the comparison could change if an ANOVA was use..
Let x ¯ be the observed mean of a random sample of size n from a normal distribution having mean μ and variance σ2.
What proportion of children 10 to 15 would be classified as hyperlipidemic (assume that hyperlipidemia is defined as a total cholesterol lelvel of 200)?
a commuter must pass through five traffic lights on her way to work and will have to stop at each one that is red. she
Stores A, B, and C, have 50, 75, and 100 employees and respectively 50%, 60%, and 70% if these employees are women. Resignations are equally likely among all employees regardless of sex. One employee resigns and she is a woman. What is the probabi..
a study of the time spent shopping in a supermarket for a market basket of 20 specific items showed an approximately
A company is interested in knowing which are the potential sales next year if you use $ 20,000 in advertising expenses. The company uses the information from previous years to make its sales forecast.
two percent .02 of the items produced by a machine are defective. a random sample of 60 items is selected and checked
A random sample of 346 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contingency table below.
In a clinical study of an allergy drug, 108 of the 203 subjects reported experiencing significant relief from their symptoms. Using a significance level of .01, test the claim that more than half of all those using the drug experienced relief.
Show that if Z1 and Z2 are independent standard normal random variables, then for all ρ (correlation), Z 1 and ρZ 1 +sqrt(1-ρ 2 )*Z 2 are standard normal with correlation ρ.
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