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Of all the flashlights in a large shipment, 16 % have a defective bulb, 14 % have a defective battery, and 7 % have both defects. If you purchase one of the flashights in this shipment, find the probability that it has a defective bulb or defective battery, a good bulb or good battery,a good bulb and good battery.
What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
A vending machine dispenses coffee into a twelve ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.08 ounce.
Does this sample give sufficient evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of general population? Use two-tailed test with α = .01.
What score was earned by more students than any other score? Why? What was the highest score earned on the exam?
Write down the name of 4 parts of the regression equation.
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Use the Internet to find a website that shows an example or application correlation or regression in the area of your interest or in your profession. Discuss how correlation or regression was used and summarize your finding.
A researcher obtains t = 4.00 and MD = 9 for a repeated-measures study. If the researcher measures effect size using the percentage of variance accounted for, what value will be obtained for r2?
Given the following revenue and cost function for a business firm, calculate the break-even quantity, total revenue, total cost and total profit at break-even level of production.
What information is provided by the sign (= or -) of the Pearson correlation? What information is provided by numerical value of the Pearson correlation?
Complete the table and answer the following questions. Use the .05 significance level.
If we select a crew member at random, what is the probability the crew member earns:
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