According to the Coffee Research Organization (http://www.coffeeresearch.org) the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens revealed they consumed the following amounts of coffee, reported in cups, yesterday. At the .05 significance level does this sample data suggest there is a difference between the national average and the sample mean from senior citizens?
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Suppose the time arrival between two consecutive defective light bulbs from a production line has a uniform distribution over an interval from 0 to 90 minutes. a) What is the mean of the time int
Suppose the time arrival between two consecutive defective light bulbs from a production line has a uniform distribution over an interval from 0 to 90 minutes. a) What is the mean of the time interval? b) What is the variance of the time interval? c) What is the standard deviation of the time interval? d) What is the probability that the time interval between two consecutive defective light bulbs will be less than 10 minutes? e) What is the probability that the time interval between two consecutive defective light bulbs will be between 10 and 20 minutes? f) What is […]
A researcher wants to determine if eating blackberries can help reduce the number and severity of sore throats. Ten people have volunteered to take
A researcher wants to determine if eating blackberries can help reduce the number and severity of sore throats. Ten people have volunteered to take part in a pilot study and it is your job to randomly assign them to a control or treatment group by flipping an imaginary coin. Try to behave like a coin and pretend to flip your mental coin for each volunteer – with an imaginary heads, assign the subject to the control group – with an imaginary tails, assign the subject to the treatment group. Use “T” for treatment group and “C” for control group. You can state […]
In a survey of men in the United States (ages 20 to 29), the mean height was 69.9 inches with a standard deviation of 3.0 inches. Assume the height…
In a survey of men in the United States (ages 20 to 29), the mean height was 69.9 inches with a standard deviation of 3.0 inches. Assume the height data is normally distributed. Zak’s height has a z-score of -1.7. Which one of the following statements is true? Zak is shorter than 65 inches. Zak’s height is in the lower 2.5% of men’s heights (ages 20 to 29). Zak is taller than 72.9 inches.
We created a probability distribution with data from a survey of 1200 college students. The variable is the student’s perception of his or her body…
We created a probability distribution with data from a survey of 1200 college students. The variable is the student’s perception of his or her body weight. What is the probability that a randomly selected student does not feel their body weight is “about right?” 0.7125 0.1958 0.2875
