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Identify the type of sampling used: random, systematic, convenience, stratified or cluster. To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at daimler-chrysler selects every 13th van that comes off the assembly line starting with the tenth until she obtains a sample of 70 vans. which type of sampling method is used?
Given that the student selected is a social science major, what is the probability that she is also a sophomore? Write your responses as fractions.
Is the gender distribution for theater goers significantly different from the distribution for the general college? Test at the .05 level of significance.
Construct the following confidence intervals for your data set:
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today,| February 13, 2006). Do male and female consumers differ in the amounts they spend?
Find the test statistic value for two mean tests using equal variance formula.
one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0..
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
Based on this confidence interval, can we be 95% confident that the mean yield using catalyst XA-100 exceeds 750 pounds per hour? Why?
based on our past history of winning bids on projects the probability of winning the next contract to build a school is
A sample of 100 mortgages approved during the current year showed that 31 were issued to a single-earner family or individual. The historical average is 25 percent.
suppose that a financial analyst wants to evaluate the variability of the prices of a new stock in the market. the
What happens to the boundaries for the critical regions?
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