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Suppose you are planning a similar experiment; you will study the effect of LSD (rather than toluene) on brain NE. You anticipate using a two-tailed t test at alpha = 0.05. Suppose you have decided that a 10% effect (increase or decrease in mean NE) of LSD would be important, and so you want to have good power (80%) to detect a difference of this magnitude.
Using the experiment as a "pilot study", determine how many rats you should have in each group for a non-directional test. (The mean NE in the control group in example 7.9 is 444.2 ng/g and the SD is 69.6 ng/g.)
what is the post-test probability of disease being present in a patient with a positive test result for test A if a cutoff value of 4.0 mg/ml is chosen?
In addition, the gender of the respondent is noted. After analyzing the results the following table of joint probabilities was produced: Find the probability that a customer who rates Windsor as excellent is a man. 0.45
Write the claim mathematically and identify H0 and Ha (b)Find the critical value(s) and identify the rejection region(s). (c) Find the standardized test statistic.
Determine the maximum and minimum dollar amount spent per week for middle 50% of one-person households. Suppose that standard deviation is$5 and variable is normally distributed.
Scores are whole values. The top 3% receive $500.00. what is the minimum score you would need to receive this award?
A random sample of n = 4 scores is selected from a population with µ = 80 and σ = 20. On average, how much difference would you expect between the sample mean and the population mean?
An alcohol awareness task force at Big-Ten university sampled 20 students after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying
A national Retail Foundation survey found housholds intended to spend an average of $932 during the December holiday season. Assume that the survey included 850 households and that the standard deviation of the sample is $215.
In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers.
In order to determine the effect of secondhand smoke, the state agency needs to measure the nicotine level at the work site. It is not possible to measure the nicotine level for every company that reports to the agency.
The time between arrivals of cars at the Petroco Service Station is defined by thw following probability distribution.
Assume that a normal model with a mean 263 days and standard deviation can describe the duration of human pregnancies 12 days. At least how many days should the longest 30% of all pregnancies last?
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