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A company's cost-to-income ratio is a measure of its ability to control its costs. The lower the ratio (expressed as a percentage), the better the cost management is within the company. For a company to remain profitable and attract investment, a rule of thumb exists that states that the company's cost-to-income ratio should be less than 75%.
An investment analyst wished to test this rule of thumb amongst JSE companies, so selected a sample of 50 and recorded their cost-to-income ratios.
Test, at the 5% significance level, whether the average cost-to-income ratio amongst all JSE companies adheres to the rule of thumb. Formulate the null and alternative hypothesis and interpret the findings.
appleton cabinets inc. manufactures and installs custom designed cabinets and counter tops for kitchens and bathrooms.
Male runners follow a normal distribution with unknown mean u and standard deviation o = 5 kg. You compute 95% confidence interval for u. What is the 95% confidence interval for u?
in the world series of baseball two teams a and b play a sequence of games against each other and the first team that
An automotive expert claims that the large number of self-serve gasoline stations has resulted in poor automobile maintenance, and that the average tire pressure is more than 4 pounds per square inch (psi) below its manufacturer's specification.
Given the following rating outcomes, determine if there exists a reasonably strong degree of agreement between the two judges.
perform the two anova tests. include the anova table and an explanation of your results. be sure to write full
Given P(x), where P describes the kth Lagrange polynomial that interpolates f at k+ 1 points:
the marketing manager of a large supermarket chain would like to determine the effect of shelf space in feet on the
A random sample of 8 recent batches produced the following yields. Conduct a hypothesis test to determine whether the true mean yield has decreased.
Dr. Easy saw the scores from the MA-222 test and used the occasion to test the old adage that girls are smarter than boys on subjects tested by ACT.
A test on zoology is to be given next week. Suppose 75 percent of the students study for the test and 25 percent do not. If a student studies for the exam, the probability that he or she will pass is 0.90. If the student does not study, the pro..
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
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