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Question: For each of the following situations, specify the mean of the sampling distribution of the difference in sample proportions:
a. The populations are male and female registered voters in the United States, and it is of interest to compare the proportions of males and females who are registered with the Democratic Party. Suppose that, in truth, 30% of men and 36% of women are registered Democrats. Random samples of 500 will be taken from each population.
b. The populations are adults with college degrees and adults without college degrees. It is of interest to compare the proportions that support the legalization of marijuana. Suppose that, in truth, 30% of those with college degrees support it, and 20% of those without college degrees support it. Random samples of 100 will be taken from each population.
c. The populations are left-handed and right-handed junior high school students. It is of interest to compare the proportions that have learned to play a musical instrument. Suppose that, in truth, 40% of both populations have learned to play a musical instrument. A random sample of 800 right-handed students and 200 left handed students will be taken.
A survey of the opinions of property owners about a street widening project was taken to determine whether the resulting opinion was related to the distance of front footage.
A car dealership is worried that Hondas are getting lower sales than Hyundai. Two independent random samples have been selected 630 observations from population 1 (Hondas) and 610 from population 2 (Hyundai).
Suppose each trial for pins takes 12 minutes and each trial for shafts takes 25 minutes. What is the expected value and variance of the total time required?
assume that a procedure yields a binomial distribution with a trial repeated n times. use a binomial probabilities
Estimating a linear regression equation to predict the future values of the dependent variable Y.
Recognize sample, population, sample statistic, and population parameter: Nasonex is the drug used to treat allergy symptoms.
suppose that births are equally likely to be on any day. what is the probability that somebody chosen at random has a
question john smith needs to decide where to get a haircut. he decides to pick one based on how much time he has to
In each of the given situations, indicate whether the potential bias is a selection bias, a nonparticipation bias, or a response bias.
What does null hypothesis for repeated-measures hypothesis test state?
ABC insurance sells term life insurance policies. If the plicy holder dies during the term of the policy ABC pays out $100000. If the person does not die ABC pays nothing and there is no further value to the policy.
A telescpoe manufacturur wants its telescopes to have standard deviations in resolution to be significantly below 2 when focusing on objects 500 light-years away.
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