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Question: 1. An unknown distribution has a mean of 45 and a standard deviation of eight. Samples of size n = 30 are drawn randomly from the population. Find the probability that the sample mean is between 42 and 50.
2. The length of time taken on the SAT for a group of students is normally distributed with a mean of 2.5 hours and a standard deviation of 0.25 hours. A sample size of n = 60 is drawn randomly from the population. Find the probability that the sample mean is between two hours and three hours.
Consider the circumstances under which a repeated-measures experimental research design, rather than a between-participants experimental design, might be more or less appropriate.
You are required to submit the FINAL copy of this assignment, but you may first submit an optional DRAFT. This will allow you to receive qualitative feedback that can inform your revision.
Give the confidence interval as reported in the article. Is the reported interval in the form of an interval or is it in the form of estimate ± margin of error? If it is not in interval form, state it in interval form.
Among those taking the Graduate Record Exam, 18 people are randomly selected.
An online site presented this question, "Would the recent norovirus outbreak deter you from taking a cruise?" Among the 34, 123 people who responded, 63% answered "yes." Use the sample data to construct a 95% confidence interval estimate for the p..
How does one find expected profit from a probability demand distribution?
Conduct a global hypothesis test to verify the overall statistical significance (p-value =.05) of the final estimated multiple regression equation.
Find a 90% confidence interval for the true average customer waiting time. Show your solution. Repeat part (a) using 98% confidence interval. Repeat part (b) using 98% confidence interval.
Compute the 3.9% confidence interval on the mean. Which confidence interval is more practical and useful in a business situation? Why?
The mean salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000. Compute the z values for both 1)Rob and 2)Rachel.
Ball bearings are manufactured with a diameter of 5 mm. But the process has variation, so the diameter is normally distributed with a mean of 5 mm and a standard deviation of .02 mm. A) What proportion of ball bearings are more than 5.03 mm?
problem 1 - what sample size is needed to obtain a 90 percent confidence interval for the mean protein content of meat
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