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(a) A cut-off score of 85 has been established for a sample of scores in which the mean is 65. If the corresponding z-score is 2.5 and the scores are normally distributed, what is the standard deviation?
(b) The standard deviation of a normal distribution is 12 and 95% of the values are greater than 6. What is the value of the mean?
(c) The mean of a normal distribution is 132, and only 10% of the values are greater than 155. What is the standard deviation?
Find Probability of independent events.Consider again the auto repair rates described. If you own two cars, what is the probability that.
Mr. Smith had 11 stocks that averaged 11.3 percent with a standard deviation of 3.2 percent. At the .02 level of significance, can we conclude that Mr. Jones' stocks have a different variation?
Formulate a linear programming model that can be used to develop a daily production schedule for the Buffalo and Dayton plants that will maximize daily production of ignition systems at Cleveland.
Probability of two mutually exclusive events intersecting Can be any value between 0 to 1, Must always be equal to 1.
A simple random sample of 1600 families is chosen. What is the chance that between 9% and 11% of the sample families will not own car?
A square grid is placed over a city map. There are residential areas at the coordinates (0,1), (2,3) and (5,6). The respective populations of the three areas are 2500, 2000, and 3000. A centralized facility is being considered for either the point..
Calculate and compare the means for IQ as a dependent variable and gender as your independent variable. Do you think males and females differed in their IQ scores? Why?
labour productivity improvements in distribution centrecase studyover the past decade singapores economy has grown by
a simple random sample of 12 e-readers of a certain type had the following minutes of battery life.287 311262 392 313
Construct a scatterplot of the relationship between the 2 variables. Plot the regression line on this graph
If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.
Test whether the music reduces studying capacity at a .05 level of significance.
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