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A gasoline tank for a certain car is designed to hold 15 gallons of gas. Suppose that the actual capacity of a randomly selected tank has a distribution that is approximately normal with a mean of 15.10 gallons and a standard deviation of 0.10 gallons. What proportion of tanks will hold between 14.75 and 15.10 gallons of gas?
If four tanks are randomly selected, what is the probability that their average capacity will be between 14.75 and 15.10 gallons?
All answers to 4 decimal places please.
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
A new company is manufacturing light bulbs. The CEO claims that the average light bulb lasts 260 days. A researcher selects 25 bulbs for testing. The sample bulbs last an average of 250 days with a standard deviation of 20 days.
you want to determine if the number of thunderstorms affects the number of eggs chickens lay. you sample farms in your
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the seats were subjected to a safety stress test in which scores were assigned on a continuous scale of 0 to 10.
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
Area to right of mean of normal probability distribution is?
question a researcher has been hired by a pizzeria to determine which type of crust customers prefer. the restaurant
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .25 hours?
What is the purpose of statistical estimation? What statistics do you find most useful in regression analysis? Why?
Library staff has reported that much of the time the study rooms are empty, despite a full booking sheet. Frame a research question and state the objectives of the study.
A contingency table has 5 rows and 4 columns. How many degrees of freedom are there?
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