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The mean number of words per minute read by sixth graders is 89 with a standard deviation of 16. If 66 sixth graders are randomly selected, what is the probability that the sample mean would be greater than 92.25?
A random sample of 12 batteries yields X-bar = 34.2 hours and s = 5.9 hours. Give a 95% confidence interval for the average life of a battery.
a certain researcher thinks that the proportion of women who say that the earth is getting warmer is greater than the
Alexa got 144 on her test which has a mean of 128 and a standard deviation of 34. What is her z-score?How do you calculate the z score for the raw score of 10 based on the following distribution: 8, 9, 15, 30, 7, 8 ?
question an er nurse notices that when she and her colleagues are asked to work overtime they seem to get less sleep
Select the level of significance, and determine critical, ZCR value.
a team of scientists is due to spend six months in antarctica carrying out research. one major piece of equipment they
Find the probability that 665 or fewer college students in the sample send and receive text messages with their phones? Is this result unusual?
A product is made up of two subsystems in parallel. Subsystem one consists of ten elements in series each with a failure rate of 1/100. The second subsystem consists of 5 elements in series each with a failure rate of 1/200. What is the overall re..
based on the cell phone usage data what is the most economical individual plan?69.99 unlimited monthly1.99day
Create a deviation from mean for the temperature variables and create squared terms for each of the temperature variables in deviation from mean form.
a companys construction time follows a normal distribution. the mean time to construct a building is 100 days and the
if x1 and x2 are independent random variables x1 has a chi-square distribution with 3 degrees of freedom and x1 x2 has
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