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Fifty-six percent of American adults eat at a table-service restaurant at least once a week. Suppose that four American adults are asked if they ate at table-service restaurants last week. What is the probability that all of them say yes?
An insurance company is trying to determine if there is a significant difference in the average number of sick days that registered nurses and nurse practitioners use per year. The data analysis provided the following output.
Researcher wants to estimate in $300 true average amount of money country spends on road repairs each year. If she wishes to be 90% confident, how large sample is essential?
When we carry out a chi-square test of independence, the expected frequencies are based upon the Null hypothesis - true or false.
Let X be the number of correct guesses by your friend in the 100 trials and Use the Normal approximation with the continuity correction - Which of the following might be reasonably modeled by the binomial distribution
Chocolate bars produced by a certain machine are labeled with 8 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. What proportion of chocolate bars weighs less th..
According to the Scranton Edison Company, utility-plant investment per employee was approximately $453,300; $492,400; $498,900; $531,900; $553,900;
The cost of an e-commerce website can vary a great deal. A market research team hypothesized that the cost of an average website is $3500.
Four students riding to school together offer a the excuse of a flat tire on their car for missing a test. On the makeup test, the professor asks the students to each identify the tire that went flat.
A researcher claims the average American drinks 52 gallons of cola per year with a population standard deviation of 2.0 gallons. We sample 25 random people and find the mean yearly consumption was 49 gallons.
A small company that manufactures computers computer received 10 shipments of the chips in lots of 20 chips from the manufacturer. what is the probability that there will be 2 shipments with at least one defective chip?
A machine has three components working independently. The probability that Component A fails is 0.1, the probability that component B fails is 0.2, and the probability that component C fails is 0.3.
A physician wanted to estimate the mean length of time µ that a patient had to wait to see him after arriving at the office.
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