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The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 400 minutes?
a. 0
b. 0.023
c. 0.159
d. 0.977
e. none of the above
Perform pair wise comparisons of the treatment means by computing a Tukey simultaneous 95 percent confidence interval for each of the pair wise differences μ1 - μ2, μ2 - μ3, and μ2 - μ3. Which type of program content results in the worst mean bran..
What is a discrete and continuous random variable? What is a probability distribution for a discrete random variable? Please provide examples to illustrate your answer? Please no textbook or internet examples, original examples only.
More than 13 successes in 19 trials with a 40 percent chance of success. (Round the answer to 4 decimal places.) Fewer than 7 successes in 15 trials with a 40 percent chance of success. (Round the answer to 4 decimal places.)
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours
Given that this sample is extremely large, can the responses be considered to be representative of the population of the United States? Explain.
What is the equation for least squares line? Calculate the coefficient of determination.
The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes: 5 4 5 4 4 3 6 4 3 3 5 6 3 3 2 7 4 5 2 2 2 3 52
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
What percentage of items will weigh between 6.4 and 8.9 ounces?
which is a value often used for the upper limit of the range of normal values. What do the results suggest about the sample group?
Having a difficult time finding a health care article that pertains to correlation statistical procedures. I am not even sure what that means.
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