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On the standardized spatial skills task, normative data reveal that people typically, get µ= 15 correct solutions. A psychologist tests n = 7 individuals who have brain injuries in right cerebral hemisphere. For following data, find out whether or not right-hemisphere damage results in significantly reduced performance on spatial skills task. Test with alpha set at .05 with one tail. Data are as follows: 12, 16, 9, 8, 10, 17, 10
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
The original simple form of the Connecticut state lottery (ignoring a few gimmicks) awarded the following prizes for each 100,000 tickets sold. The winners were chosen by drawing tickets at random. If you hold one ticket in this lottery, what is y..
A person must score in the upper 2% of the population on an IQ test to qualify for member ship in Mensa, the international high-IQ society. If IQ scores are normally distributes with a mean of 100 and a standard deviation of 15, what score must a ..
A television station estimates that 50% of college students watch the super bowl. For a sample of 120 students selected at random, what is the mean and variance of the number of students who watch the game?
Using convolution, determine the pdf of a continuous random variable Z where Z = X + Y. Here, X has a uniform distribution on [0, 3] and Y is a constant of value 2. Assume that X and Y are independent.
Find the probability that not enough seats will be available. Is this probability low enough so that overbooking is not a real concern?
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
Discuss something you have witnessed or observed in nature. Discuss the temptation to imply or infer causality and be sure to identify areas of future investigation that might be warranted to determine cause and effect.
Is there enough evidence to support the consumer's conjecture at alpha=.10? 7.2 8.1 7.8 7.4 8.0 8.2 8.1 7.9
A manager wishes to find out whether there is a relationship between the number of radio ads aired per week and the amount of sales (in thousands of dollars) of a product. The data for the sample are shown below. a) Draw the scatter plot for the v..
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
Find out the following probabilities. Probability that exactly 27 items will be good.
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