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A survey of students on a highly popular course found that 54% buy the textbook recommended for the course, and that 55% attend every lecture. However, 21% of the students neither go to all the lectures nor buys the recommended textbook. What is the probability that a randomly chosen student who buys the textbook attends every lecture?
In a sample of 80 mail carriers 16 had been bitten. At the 0.05 level of confidence, is there a significant difference in the proportions?
What if the assumption E[u/x]=0 is not satisfied? Illustrate using an example. Explain the relationship represented by a population regression function.
A new county hospital is attempting to determine whether it needs to add a particular specialist to its staff. Five percent of the general hospital population in the county contracts the illness the specialist would treat.
The Graduate Management Admission Council, who administers the test, claims that the mean total score is 529. Suppose a random sample of 8 students took the test, and their scores are given below. 699, 560, 414, 570, 521, 663, 727, 413 Use α = .05..
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
Assume rivets are defective independently of one another, each with the same probability. If 24% of all seams need reworking, determine the probability that rivet is defective?
Assume that both samples are independant simple random samples from populations having normal distributions.
Place the following set of numbers in ascending order. Determine the maximum and minimum values of the following set of numbers. 36/7,-1,-2/3,-5,26/9
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each loation.
Determine the mode for this distribution. Describe why you can't calculate the mean number of times using data in the table.
If the weekly average expenditure of all households is $53,000 but an expert argues that the weekly expenditure is more than $53,000, test his claim at a 5% level of significance and interpret your results.
Construct a 90% confidence interval for the proportion of all kernels that would not pop.
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