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Question: Comparing IQ scores. The Wechsler Adult Intelligence Scale (WAIS) is an IQ test. Scores on the WAIS for the 20 to 34 age group are approximately Normally distributed with mean 110 and standard deviation 15. Scores for the 60 to 64 age group are approximately Normally distributed with mean 90 and standard deviation 15. Sarah, who is 30, scores 130 on the WAIS. Her mother, who is 60, takes the test and scores 115.
(a) Express both scores as standard scores that show where each woman stands within her own age group.
(b) Who scored higher relative to her age group, Sarah or her mother? Who has the higher absolute level of the variable measured by the test?
The probability distribution function of a random variable, X is given by f(x)=k(x2 -1) where x=2,3,4,5 Let F(x) be the c.d.f of X.
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
Draw a histogram of the sample means. Do you notice a difference in the shape of the distribution of sample means compared to the shape of the population distribution?
An unknown distribution has a mean of 80 and a standard deviation of 12. A sample size of 95 is drawn randomly from the population.
If there are 12 business-class passengers and 50 tourist-class passengers on a particular light, what are the expected value of total luggage weight and the standard deviation of total luggage weight?
A random variable X has the following probability distribution:- Calculate the mean of X.- Calculate the variance of X.- Calculate the standard deviation of X.
a researcher randomly selects a sample of participants from a population with a variance of 4. if the researcher
Data analysis must be completed using a statistical software package - either Statistix for Windows, with the MegaStat add in, SPSS, SAS, R or any other legitimate software package.
Let market demand be given by Q( P) = 200 - P. Each firm's cost function is C(qi ) = 20qi , where i = 1, 2. Using the Cournot model, find each firm's output, profit, and price.
What is the population of interest to the researcher?- Identify the sample.- What inference was made by the researcher?- How might the nonresponses impact the inference?
1.a pediatrician is interested in studying the effect of motrin on reducing temperature in young children. four
part 1 what are the conditions for using the standard deviation formula when conducting a significance test? be
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