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The curator of a fossil museum finds there were 1450 visitors in May and 1890 visitors in June. At the beginning of June, he had hired Bert McGruff, a popular local athlete, to serve as a tour guide. Mr. McGruff, pointing out the increase in attendance, has demanded a raise in pay. Considering this situation as an experiment:
a. Identify the dependent and independent variables in this experiment.
b. Are there any extraneous variables that might have influenced this experiment?
c. Given your response to part (b), evaluate the internal validity of the experiment. Does Bert's request for a raise seem to be justified?
Suppose we want to modify the differentiation program so that it works with ordinary mathematical notation, in which + and * are infix rather than prefix operators.
1. Consider an in?nite server queuing system in which customers arrive in accordance with a Poisson process with rate λ, and where the service distribution is exponential with rate μ. Let X(t) denote the number of customers in the system at time t. F..
You are asked to estimate the chance that the sum will be positive.
What is the chi-square test statistic for H0? What are the degrees of freedom?
Is there a significant relationship between "sibs"and "childs"? Explain how you reach your decision (hint: p-value):
a researcher wishes to estimate with 95 confidence the proportion of adults who have high-speed internet access.
Given that X‾ = 78, σ2 = 25, n = 10 and α = .05, test H0 : μ > 80, assuming observations are randomly sampled from a normal distribution. Also, draw the standard normal distribution indicating where Z and the critical value are located.
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
in an inertia welding experiment a sample of 50 welds made with a standard welding method were tested. the sample mean
State the Null Hypothesis and the Alternative Hypothesis. Determine the test statistic. Determine the P-value
1. given the following probabilities compute all joint probabilities to 2 decimals.pa .9pac .1pbnbspnbspa
verify that the function fx 3414x x 0 1 2... is a probability mass function. determine the requested probabilitiesa
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