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A sample has a mean of m=25. if one person with a score of x=25 is added to the sample, what effect will it have on the sample mean?
a. sample mean will increaseb. sample mean will decreasec. sample mean will remain the samed. cannot be determined from the information given.
What are the null and alternative hypothesis for this? What is a type II error in context of this test? Suppose that the researcher deceides not to reject the null hypothesis what sort of error might he be making?
If the doctor wants to use height to predict head circumference run a linear regression on the data. Find the r-value and comment about it.
How much time and energy do you invest in making sure you aren't guilty of the fundamental attribution error or the self-serving bias?
Pilot sample of n = 50 tires illustrated sample standard deviation equal to 4,000 miles. Based on this information, required sample size is?
Determine if there is a linear correlation between annual income and the amount of insurance? What is the linear regression line for this data?
Basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.
What is the probability of completing the exam in one hour or less (to 4 decimals)? What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes.
If I have a set of values(direct measurements of dynamic deformations of a road at 100m) between 3 and~1000, how can I calculate the 2 characteristical values wich limits the interval including 85,95% of all possible measurements on this road? Using ..
Where is the flaw and how can it be fixed? If R^2 is taken as a model for the Euclidean plane, does this help resolve the difficulty? Explain.
Suppose that among all participants, the mean test score is 70.07 and the standard deviation is 10.27. Use z-scores to interpret a raw score of 80. What is the corresponding z-score? How would you interpret this result? Show your work.
Using a significance level of 0.03, carry out a hypothesis test to determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
What units represent the margin of error? Suppose you want to decrease the margin of error, but want to keep the 95% confidence interval. What do you need to do?
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