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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.
The mean weight of trucks traveling on the the highway is unknown. A state highway inspector needs an estimated mean. He selects 49 trucks passing the weighing station and gets a mean of 15.8 tons
i have filled a bag with differently colored ping-pong balls. there are twenty balls in the bag. twelve are red six
Suppose that 98% of the customers in your market have Internet access, and you select a random sample of 500 customers. What is the probability that the sample has:
researchers studied the effects of adding an exercise program to dieting in the achievement of weight loss. a sample of
The sample produced a mean of 535 mL with a standard deviation of 0.47 mL. Assume that the distribution of the amount of lotion is approximately normal.
the macburger restaurant chain claims that customers mean waiting time is 3 minutes. the quality assurance department
Reflect on radical expressions and their applications, and then consider how you might apply radical expressions to your daily life. Explain this application,
an engineer takes a large number of independent measurements of the length of a component and obtains mean x 5.2 mm
What is the probability that the majority of the selected parents put their children who are under the age of 6 in car seats?
Discuss contingencies and how they are reported on financial statements. What conditions must be met before a contingency can be charged against income?
there are 1000 students in the senior class at a certain high school. the high school offers two advanced placement
The average weight of the sample is 10.2 g. From past shipments, it is known that the standard deviation of weight among mice is 2 g. Find a 95% confidence interval for the mean weight of all the mice in the shipment.
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