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The z distribution and statistics test scores: Imagine that your statistics professor lost all records lost all records of students' raw scores on a recent test. However, she did record students' z scores for the test, as well as the class average of 41 out of 50points and the standard deviation of points. She informs you that your z score was 1.10.
An automobile club claims that the average time for a non-stop trip from new york city to Washington, D.C. by automobile is 4.5 hours. A disbelieving driver feels that the claim is incorrect.
The route used by a certain motorist in commuting to work contains tow intersections with traffic signals. The probability that he must stop at the first signal is 0.4, the analogous probability for the second signal is 0.5. and the probability th..
Solve for the following items: The point on the x-axis that is equidistant (equal distance)from (10,4) and (6,2).
we wish to estimate the mean using a sample size of n = 49. Find the probability that we could be correct within 1kg/m 2 .
Inspect table produced in question 2 above. Comment on relative sensitivity of minimum sample size to actual proportion and to desired half width.
MATH 221 Statistics for Decision Making iLab. Give and interpret the 95% confidence interval for the hours of sleep a student gets
For this table, the value of the chi-square statistic is 17.78, and to three decimal places, the corresponding pvalue is .000. Based on these results, state a conclusion about the two variables, and explain why you came to this conclusion.
The facility has set a goal value of 60 minutes. Find an upper capability index assuming normality of distribution of turnaround times. In what proportion of time will the goal be met?
joint pmf p(X1,X2)=(X1+2X2)/18, (x1,x2)=(1,1),(1,2),(2,1),(2,2), zero elsewhere. Determine the conditional mean and variance of X2, given X1=x1, for x1=1 or 2. Also compute E(3X1-2X2).
in the world series of baseball two teams a and b play a sequence of games against each other and the first team that
Analyze the data with an F test and a set of Tukey HSDs. Determine d for the schizophrenia-depression comparison. Write a conclusion about Dr. Rorschach's test.
The 2009 National Assessment of Educational Progress (NAEP) gave a mathematics test to a random sample of eighth-graders in Texas. The mean score was 287 out of 500. To give a confidence interval for the mean score of all Texas eighth-graders, you..
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